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Updated Apr 20, 2026

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Razlika med močnimi in šibkimi kislinami ter bazami

Če si se kdaj spraševal, zakaj citronska kislina ne peče... Show more

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# Močne in šibke kisline ter baze

Močne in šibke kisline ter baze

To je nadaljevanje splošne snovi o kislinah in bazah. Tukaj gremo bolj v

Osnove močnih in šibkih elektrolitov

Zdaj, ko razumeš osnove kislin in baz, je čas za resno računanje. Ključ do uspeha je razumevanje razlike med popolno in delno disociacijo.

Elektroliti so snovi, ki v vodi razpadejo na ione in prevajajo električni tok. Toda ne vsi se obnašajo enako! Močni elektroliti popolnoma razpadejo (uporabimo enosmerno puščico →), medtem ko šibki elektroliti le delno disociirajo in vzpostavijo ravnotežje (ravnotežna puščica ⇌).

Stopnja disociacije (α) ti pove, koliko molekul je dejansko razpadlo na ione. Pri močnih elektrolitih je α praktično 1 (100%), pri šibkih pa precej manjša od 1. Formula: α = koncentracija disociiranih delcev / začetna koncentracija.

💡 Zapomni si: Enosmerna puščica = močan elektrolit, ravnotežna puščica = šibek elektrolit. To je temelj za vse nadaljnje računanje!

Za šibke kisline in baze imamo še konstanti disociacije Ka in Kb. Večja kot je konstanta, močnejša je kislina ali baza.

# Močne in šibke kisline ter baze

Močne in šibke kisline ter baze

To je nadaljevanje splošne snovi o kislinah in bazah. Tukaj gremo bolj v

Močne kisline in baze

Pri močnih kislinah in bazah je računanje super enostavno - 100% molekul razpade na ione! To pomeni, da je koncentracija H⁺ ionov (ali OH⁻ ionov) enaka začetni koncentraciji.

Močne kisline se moraš naučiti na pamet: HCl, HBr, HI, HNO₃, H₂SO₄ (samo prva stopnja!), HClO₄, HClO₃. Močne baze so hidroksidi 1. in 2. skupine (razen Be in Mg): NaOH, KOH, Ca(OH)₂, Ba(OH)₂.

Primer: 0,1 M HCl popolnoma disociira → [H⁺] = 0,1 M → pH = -log(0,1) = 1. Preprosto!

💡 Pozor: H₂SO₄ je zvijačna! Prva disociacija je popolna, druga pa ne. Za večino nalog upoštevaj samo prvo stopnjo.

# Močne in šibke kisline ter baze

Močne in šibke kisline ter baze

To je nadaljevanje splošne snovi o kislinah in bazah. Tukaj gremo bolj v

Šibke kisline in baze

Tu postane stvar zanimiva (in nekoliko bolj zapletena). Pri šibkih elektrolitih gre za ravnotežje, zato so koncentracije ionov precej nižje od začetne koncentracije.

Za šibko kislino HA pišemo: HA ⇌ H⁺ + A⁻. Konstanta disociacije kisline je: Ka = [H⁺][A⁻]/[HA]. Manjša vrednost Ka pomeni šibkejšo kislino.

Podobno velja za šibke baze: B + H₂O ⇌ BH⁺ + OH⁻, kjer je Kb = [BH⁺][OH⁻]/[B].

Ostwaldov zakon povezuje Ka, stopnjo disociacije α in koncentracijo: Ka = c₀α²/(1-α). Ker je α pri šibkih elektrolitih zelo majhen, lahko poenostavimo: Ka ≈ c₀α².

💡 Ključna formula: Za šibke kisline je [H⁺] = √(Ka × c₀). To je tvoj najboljši prijatelj pri računanju pH!

Iz Ostwaldovega zakona sledi tudi: α ≈ √Ka/c0Ka/c₀.

# Močne in šibke kisline ter baze

Močne in šibke kisline ter baze

To je nadaljevanje splošne snovi o kislinah in bazah. Tukaj gremo bolj v

Rešeni primeri - šibke kisline

Poglejmo si praktičen primer z ocetno kislino, ki jo poznaš iz kuhinje.

Naloga: Izračunaj pH 0,2 M CH₃COOH, če je Ka = 1,8 × 10⁻⁵.

Rešitev: Uporabi formulo [H⁺] = √(Ka × c₀) = √(1,8×10⁻⁵ × 0,2) = √(3,6×10⁻⁶) = 1,9 × 10⁻³ M. Torej pH = -log(1,9×10⁻³) = 2,72.

Vedno preveri 5% pravilo! Stopnja disociacije je α = 1,9×10⁻³/0,2 = 0,0095 = 0,95%. Ker je to manj kot 5%, je bila poenostavitev upravičena.

Drugi primer: Če imaš 4,2% disociacijo mravljinčne kisline v 0,1 M raztopini, lahko izračunaš Ka z Ostwaldovim zakonom: Ka = (0,1 × (0,042)²)/(1-0,042) = 1,84 × 10⁻⁴.

💡 Nasvet: Če je α > 5%, moraš uporabiti polno enačbo brez poenostavitve ali rešiti kvadratno enačbo.

# Močne in šibke kisline ter baze

Močne in šibke kisline ter baze

To je nadaljevanje splošne snovi o kislinah in bazah. Tukaj gremo bolj v

Šibke baze in konjugirani pari

Računanje pH šibkih baz poteka podobno kot pri kislinah, le da računaš [OH⁻] namesto [H⁺].

Primer z amonijakom: Za 0,5 M NH₃ z Kb = 1,8 × 10⁻⁵ je [OH⁻] = √(Kb × c₀) = √(1,8×10⁻⁵ × 0,5) = 3,0 × 10⁻³ M. Torej pOH = 2,52 in pH = 14 - 2,52 = 11,48.

pKa in pKb sta le drugi način zapisa: pKa = -log(Ka). Manjši pKa pomeni močnejšo kislino.

Ključna povezava za konjugiran par: Ka × Kb = Kw = 1,0 × 10⁻¹⁴. To pomeni, da če poznaš Ka za NH₄⁺, lahko izračunaš Kb za NH₃!

💡 Kdaj uporabiti kvadratno enačbo? Ko poenostavitev c₀ - x ≈ c₀ ni veljavna (α > 5%). To se zgodi pri zelo razredčenih raztopinah ali "močnejših" šibkih kislinah.

# Močne in šibke kisline ter baze

Močne in šibke kisline ter baze

To je nadaljevanje splošne snovi o kislinah in bazah. Tukaj gremo bolj v

Hiter povzetek za ponovitev

Močne kisline/baze: Popolna disociacija (→), [H⁺] ali [OH⁻] = c₀, pH računaš direktno.

Šibke kisline/baze: Delna disociacija (⇌), uporabiš Ka ali Kb konstante. Večji Ka/Kb = močnejša kislina/baza. Manjši pKa/pKb = močnejša kislina/baza.

Ključne formule s poenostavitvijo:

  • [H⁺] ≈ √(Ka × c₀) za šibke kisline
  • [OH⁻] ≈ √(Kb × c₀) za šibke baze
  • α = √Ka/c0Ka/c₀

💡 Pomembno: Vedno preveri 5% pravilo! Če je α > 5%, poenostavitev ni dobra.

Konjugirani pari: Ka × Kb = Kw = 1,0 × 10⁻¹⁴

# Močne in šibke kisline ter baze

Močne in šibke kisline ter baze

To je nadaljevanje splošne snovi o kislinah in bazah. Tukaj gremo bolj v

Končni nasveti za uspeh

Zdaj imaš vse orodje za reševanje nalog o močnih in šibkih kislinah ter bazah. Glavni trik je prepoznati, ali imaš opravka z močnim ali šibkim elektrolitom - od tega je odvisen celoten pristop.

Za močne elektrolite računaj direktno, za šibke pa uporabi konstante disociacije in preveri veljavnost poenostavitev.

Povezava Ka × Kb = Kw ti omogoča, da iz enega izračunaš drugo, kar je pogosto zelo uporabno pri nalogah.

💡 Zlato pravilo: Če dvomiš o poenostavitvi, raje uporabi kvadratno enačbo. Bolje malo več računanja kot napačen rezultat!

Temperatura vpliva na vse konstante - če ni navedeno drugače, predpostavljaj 25°C.



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Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.

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Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.

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This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.

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I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.

Xander S

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Elisha

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Kemija

44

Updated Apr 20, 2026

7 pages

Razlika med močnimi in šibkimi kislinami ter bazami

Če si se kdaj spraševal, zakaj citronska kislina ne peče tako zelo kot žveplova, je razlog v njihovi različni moči. Močne in šibke kisline ter baze se obnašajo popolnoma drugače v vodi, kar pomeni, da potrebuješ različne pristope za računanje... Show more

# Močne in šibke kisline ter baze

Močne in šibke kisline ter baze

To je nadaljevanje splošne snovi o kislinah in bazah. Tukaj gremo bolj v

Sign up to see the contentIt's free!

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Osnove močnih in šibkih elektrolitov

Zdaj, ko razumeš osnove kislin in baz, je čas za resno računanje. Ključ do uspeha je razumevanje razlike med popolno in delno disociacijo.

Elektroliti so snovi, ki v vodi razpadejo na ione in prevajajo električni tok. Toda ne vsi se obnašajo enako! Močni elektroliti popolnoma razpadejo (uporabimo enosmerno puščico →), medtem ko šibki elektroliti le delno disociirajo in vzpostavijo ravnotežje (ravnotežna puščica ⇌).

Stopnja disociacije (α) ti pove, koliko molekul je dejansko razpadlo na ione. Pri močnih elektrolitih je α praktično 1 (100%), pri šibkih pa precej manjša od 1. Formula: α = koncentracija disociiranih delcev / začetna koncentracija.

💡 Zapomni si: Enosmerna puščica = močan elektrolit, ravnotežna puščica = šibek elektrolit. To je temelj za vse nadaljnje računanje!

Za šibke kisline in baze imamo še konstanti disociacije Ka in Kb. Večja kot je konstanta, močnejša je kislina ali baza.

# Močne in šibke kisline ter baze

Močne in šibke kisline ter baze

To je nadaljevanje splošne snovi o kislinah in bazah. Tukaj gremo bolj v

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Močne kisline in baze

Pri močnih kislinah in bazah je računanje super enostavno - 100% molekul razpade na ione! To pomeni, da je koncentracija H⁺ ionov (ali OH⁻ ionov) enaka začetni koncentraciji.

Močne kisline se moraš naučiti na pamet: HCl, HBr, HI, HNO₃, H₂SO₄ (samo prva stopnja!), HClO₄, HClO₃. Močne baze so hidroksidi 1. in 2. skupine (razen Be in Mg): NaOH, KOH, Ca(OH)₂, Ba(OH)₂.

Primer: 0,1 M HCl popolnoma disociira → [H⁺] = 0,1 M → pH = -log(0,1) = 1. Preprosto!

💡 Pozor: H₂SO₄ je zvijačna! Prva disociacija je popolna, druga pa ne. Za večino nalog upoštevaj samo prvo stopnjo.

# Močne in šibke kisline ter baze

Močne in šibke kisline ter baze

To je nadaljevanje splošne snovi o kislinah in bazah. Tukaj gremo bolj v

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Šibke kisline in baze

Tu postane stvar zanimiva (in nekoliko bolj zapletena). Pri šibkih elektrolitih gre za ravnotežje, zato so koncentracije ionov precej nižje od začetne koncentracije.

Za šibko kislino HA pišemo: HA ⇌ H⁺ + A⁻. Konstanta disociacije kisline je: Ka = [H⁺][A⁻]/[HA]. Manjša vrednost Ka pomeni šibkejšo kislino.

Podobno velja za šibke baze: B + H₂O ⇌ BH⁺ + OH⁻, kjer je Kb = [BH⁺][OH⁻]/[B].

Ostwaldov zakon povezuje Ka, stopnjo disociacije α in koncentracijo: Ka = c₀α²/(1-α). Ker je α pri šibkih elektrolitih zelo majhen, lahko poenostavimo: Ka ≈ c₀α².

💡 Ključna formula: Za šibke kisline je [H⁺] = √(Ka × c₀). To je tvoj najboljši prijatelj pri računanju pH!

Iz Ostwaldovega zakona sledi tudi: α ≈ √Ka/c0Ka/c₀.

# Močne in šibke kisline ter baze

Močne in šibke kisline ter baze

To je nadaljevanje splošne snovi o kislinah in bazah. Tukaj gremo bolj v

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Rešeni primeri - šibke kisline

Poglejmo si praktičen primer z ocetno kislino, ki jo poznaš iz kuhinje.

Naloga: Izračunaj pH 0,2 M CH₃COOH, če je Ka = 1,8 × 10⁻⁵.

Rešitev: Uporabi formulo [H⁺] = √(Ka × c₀) = √(1,8×10⁻⁵ × 0,2) = √(3,6×10⁻⁶) = 1,9 × 10⁻³ M. Torej pH = -log(1,9×10⁻³) = 2,72.

Vedno preveri 5% pravilo! Stopnja disociacije je α = 1,9×10⁻³/0,2 = 0,0095 = 0,95%. Ker je to manj kot 5%, je bila poenostavitev upravičena.

Drugi primer: Če imaš 4,2% disociacijo mravljinčne kisline v 0,1 M raztopini, lahko izračunaš Ka z Ostwaldovim zakonom: Ka = (0,1 × (0,042)²)/(1-0,042) = 1,84 × 10⁻⁴.

💡 Nasvet: Če je α > 5%, moraš uporabiti polno enačbo brez poenostavitve ali rešiti kvadratno enačbo.

# Močne in šibke kisline ter baze

Močne in šibke kisline ter baze

To je nadaljevanje splošne snovi o kislinah in bazah. Tukaj gremo bolj v

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Šibke baze in konjugirani pari

Računanje pH šibkih baz poteka podobno kot pri kislinah, le da računaš [OH⁻] namesto [H⁺].

Primer z amonijakom: Za 0,5 M NH₃ z Kb = 1,8 × 10⁻⁵ je [OH⁻] = √(Kb × c₀) = √(1,8×10⁻⁵ × 0,5) = 3,0 × 10⁻³ M. Torej pOH = 2,52 in pH = 14 - 2,52 = 11,48.

pKa in pKb sta le drugi način zapisa: pKa = -log(Ka). Manjši pKa pomeni močnejšo kislino.

Ključna povezava za konjugiran par: Ka × Kb = Kw = 1,0 × 10⁻¹⁴. To pomeni, da če poznaš Ka za NH₄⁺, lahko izračunaš Kb za NH₃!

💡 Kdaj uporabiti kvadratno enačbo? Ko poenostavitev c₀ - x ≈ c₀ ni veljavna (α > 5%). To se zgodi pri zelo razredčenih raztopinah ali "močnejših" šibkih kislinah.

# Močne in šibke kisline ter baze

Močne in šibke kisline ter baze

To je nadaljevanje splošne snovi o kislinah in bazah. Tukaj gremo bolj v

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Hiter povzetek za ponovitev

Močne kisline/baze: Popolna disociacija (→), [H⁺] ali [OH⁻] = c₀, pH računaš direktno.

Šibke kisline/baze: Delna disociacija (⇌), uporabiš Ka ali Kb konstante. Večji Ka/Kb = močnejša kislina/baza. Manjši pKa/pKb = močnejša kislina/baza.

Ključne formule s poenostavitvijo:

  • [H⁺] ≈ √(Ka × c₀) za šibke kisline
  • [OH⁻] ≈ √(Kb × c₀) za šibke baze
  • α = √Ka/c0Ka/c₀

💡 Pomembno: Vedno preveri 5% pravilo! Če je α > 5%, poenostavitev ni dobra.

Konjugirani pari: Ka × Kb = Kw = 1,0 × 10⁻¹⁴

# Močne in šibke kisline ter baze

Močne in šibke kisline ter baze

To je nadaljevanje splošne snovi o kislinah in bazah. Tukaj gremo bolj v

Sign up to see the contentIt's free!

Access to all documents

Improve your grades

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Končni nasveti za uspeh

Zdaj imaš vse orodje za reševanje nalog o močnih in šibkih kislinah ter bazah. Glavni trik je prepoznati, ali imaš opravka z močnim ali šibkim elektrolitom - od tega je odvisen celoten pristop.

Za močne elektrolite računaj direktno, za šibke pa uporabi konstante disociacije in preveri veljavnost poenostavitev.

Povezava Ka × Kb = Kw ti omogoča, da iz enega izračunaš drugo, kar je pogosto zelo uporabno pri nalogah.

💡 Zlato pravilo: Če dvomiš o poenostavitvi, raje uporabi kvadratno enačbo. Bolje malo več računanja kot napačen rezultat!

Temperatura vpliva na vse konstante - če ni navedeno drugače, predpostavljaj 25°C.

We thought you’d never ask...

What is the Knowunity AI companion?

Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.

Where can I download the Knowunity app?

You can download the app from Google Play Store and Apple App Store.

Is Knowunity really free of charge?

That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.

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The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.

Stefan S

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This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.

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Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.

Anna

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Best app on earth! no words because it’s too good

Thomas R

iOS user

Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.

Basil

Android user

This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.

David K

iOS user

The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!

Sudenaz Ocak

Android user

In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.

Greenlight Bonnie

Android user

very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.

Rohan U

Android user

I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.

Xander S

iOS user

THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮

Elisha

iOS user

This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now

Paul T

iOS user

The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.

Stefan S

iOS user

This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.

Samantha Klich

Android user

Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.

Anna

iOS user

Best app on earth! no words because it’s too good

Thomas R

iOS user

Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.

Basil

Android user

This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.

David K

iOS user

The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!

Sudenaz Ocak

Android user

In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.

Greenlight Bonnie

Android user

very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.

Rohan U

Android user

I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.

Xander S

iOS user

THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮

Elisha

iOS user

This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now

Paul T

iOS user