Fun with Chemistry: Understanding Acids and Bases!

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gracie keenan

01/04/2023

Chemistry

CCEA ALEVEL CHEMISTRY ACID-BASE

Subjects

Chemistry

Physical chemistry

Acids and bases (a-level only)

Weak acids and bases ka for weak acids (a-level only)

Fun with Chemistry: Understanding Acids and Bases!

Understanding acid-base equilibria in chemistry is fundamental to grasping how acids and bases interact, including the significance of Ka in acid dissociation and methods for calculating pH of strong and weak acids.

Brønsted-Lowry theory defines acids as proton donors and bases as proton acceptors
Water plays a crucial role in acid-base reactions, forming hydronium ions (H₃O⁺)
Buffer solutions maintain stable pH levels through weak acid and conjugate base interactions
Ka values determine acid strength and dissociation extent
Blood pH regulation through buffer systems demonstrates real-world applications

01/04/2023

Acid-Base equilibria
Brønsted-Lowry acid is a proton, H+, donor
Brønsted-Lowry base is a proton, H+, acceptor
An alkali is a base that disso

Page 2: Acid Strength and Dissociation Constants

This page delves deeper into the differences between strong and weak acids, introducing Ka $acid dissociation constant$ and its relationship to acid strength. The content explains how to calculate pH using equilibrium equations.

Definition: Ka $acid dissociation constant$ measures the extent of acid dissociation in solution, with units of moldm⁻³.

Highlight: A high Ka value indicates greater acid dissociation and lower pH, while a low Ka value suggests less dissociation and higher pH.

Example: For a weak acid HA, the equilibrium equation is HA $aq$ ⇌ H⁺ $aq$ + A⁻ $aq$ , with Ka = $H⁺$ $A⁻$ / $HA$ .

Vocabulary: pKa is the negative logarithm of Ka, providing a more manageable scale for comparing acid strengths.

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Page 3: Titration and Neutralization

This page focuses on titration procedures and the interpretation of titration curves, explaining how pH changes during acid-base neutralization reactions.

Definition: The equivalence point is where the volume of one solution has exactly reacted with the volume of the second solution according to stoichiometry.

Highlight: Titration curves show three distinct regions: initial gradual pH change, rapid change near equivalence point, and final gradual change.

Example: During acid-base titration, pH changes slowly at first, then rapidly near the equivalence point, creating a characteristic S-shaped curve.

Vocabulary: Neutralization refers to the reaction between an acid and base to form water and a salt.

View

Page 3: Acid-Base Titrations and Indicators

This page details the behavior of pH during titrations and the mechanism of indicators.

Definition: Indicators are weak acids that change color at specific pH values due to their own acid-base equilibria.

Example: When base is added to an acidic solution containing phenolphthalein, the indicator changes from colorless to pink.

Highlight: The equivalence point occurs at the center of the vertical section in a titration curve.

View

Page 4: Buffer Solutions and Indicators

This page covers buffer solutions and indicator selection criteria.

Definition: A buffer solution consists of a weak acid and its conjugate base, maintaining stable pH when small amounts of acid or base are added.

Example: The ethanoic acid/sodium ethanoate system demonstrates buffer behavior.

Vocabulary: Conjugate base refers to the species formed when an acid loses a proton.

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Subjects

Chemistry

Physical chemistry

Acids and bases (a-level only)

Weak acids and bases ka for weak acids (a-level only)

Chemistry

•

252

•

1 Apr 2023

•

5 pages

Fun with Chemistry: Understanding Acids and Bases!

gracie keenan

@graciekeenan_

Brønsted-Lowry theory defines acids as proton donors... Show more

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Page 2: Acid Strength and Dissociation Constants

Definition: Ka $acid dissociation constant$ measures the extent of acid dissociation in solution, with units of moldm⁻³.

Highlight: A high Ka value indicates greater acid dissociation and lower pH, while a low Ka value suggests less dissociation and higher pH.

Example: For a weak acid HA, the equilibrium equation is HA $aq$ ⇌ H⁺ $aq$ + A⁻ $aq$ , with Ka = $H⁺$ $A⁻$ / $HA$ .

Vocabulary: pKa is the negative logarithm of Ka, providing a more manageable scale for comparing acid strengths.

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Page 3: Titration and Neutralization

This page focuses on titration procedures and the interpretation of titration curves, explaining how pH changes during acid-base neutralization reactions.

Definition: The equivalence point is where the volume of one solution has exactly reacted with the volume of the second solution according to stoichiometry.

Highlight: Titration curves show three distinct regions: initial gradual pH change, rapid change near equivalence point, and final gradual change.

Example: During acid-base titration, pH changes slowly at first, then rapidly near the equivalence point, creating a characteristic S-shaped curve.

Vocabulary: Neutralization refers to the reaction between an acid and base to form water and a salt.

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Page 3: Acid-Base Titrations and Indicators

This page details the behavior of pH during titrations and the mechanism of indicators.

Definition: Indicators are weak acids that change color at specific pH values due to their own acid-base equilibria.

Example: When base is added to an acidic solution containing phenolphthalein, the indicator changes from colorless to pink.

Highlight: The equivalence point occurs at the center of the vertical section in a titration curve.

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Page 4: Buffer Solutions and Indicators

This page covers buffer solutions and indicator selection criteria.

Definition: A buffer solution consists of a weak acid and its conjugate base, maintaining stable pH when small amounts of acid or base are added.

Example: The ethanoic acid/sodium ethanoate system demonstrates buffer behavior.

Vocabulary: Conjugate base refers to the species formed when an acid loses a proton.

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Page 1: Fundamental Concepts of Acid-Base Chemistry

This page introduces core concepts in acid-base chemistry, focusing on the Brønsted-Lowry theory and water's role in acid-base reactions. The text explains how acids and bases interact in aqueous solutions and introduces the concept of calculating pH of strong and weak acids.

Definition: A Brønsted-Lowry acid is a proton $H⁺$ donor, while a Brønsted-Lowry base is a proton acceptor.

Highlight: Water molecules accept protons from acids to form hydronium ions $H₃O⁺$ , demonstrating water's role as a base in acid dissociation.

Example: The dissociation of hydrochloric acid is written as HCl $aq$ + H₂O $l$ → H₃O⁺ $aq$ + Cl⁻ $aq$ , showing water's active role.

Vocabulary: Kw $ionic product of water$ represents the product of H⁺ and OH⁻ concentrations in aqueous solutions.

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Fun with Chemistry: Understanding Acids and Bases!

Page 2: Acid Strength and Dissociation Constants

Page 3: Titration and Neutralization

Page 3: Acid-Base Titrations and Indicators

Page 4: Buffer Solutions and Indicators

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Fun with Chemistry: Understanding Acids and Bases!

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Page 2: Acid Strength and Dissociation Constants

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Page 3: Titration and Neutralization

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Page 1: Fundamental Concepts of Acid-Base Chemistry

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