Fun with pH: Strong Acids, Bases, and Buffers Explained

Sophie

27/09/2025

Chemistry

pH Calculations Formula Sheet

305

•

27 Sept 2025

•

1 page

Fun with pH: Strong Acids, Bases, and Buffers Explained

Name: Knowunity
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Sophie

@sophie_rfgb

This PDF provides essential formulas and equations for calculating pH,... Show more

formula sheet
pH = -log₁0 [H+]
CHI 10H
- for strong acids, [H*] = [acid]
-
kw=1-0 × 10- (on data sheet)
kw=[H] [OH-]
[H*] = kw
[OH-]
[OH-] =

Formula Sheet for pH Calculations and Buffer Solutions

This page presents a concise collection of formulas crucial for pH Calculations A Level Chemistry AQA and OCR a level chemistry buffers questions. The formulas cover various aspects of acid-base chemistry and buffer solutions, essential for Module 5 acids bases buffers ph sheet pdf.

The sheet begins with the fundamental pH equation:

Definition: pH = -log₁₀ $H⁺$

This formula is the cornerstone of pH calculations, relating the hydrogen ion concentration to the pH value.

For strong acids, a simplified approach is provided:

Highlight: $H⁺$ = $acid$

This equality holds true for strong acids due to their complete dissociation in solution.

The sheet also includes the water dissociation constant (Kw) and its relationship with hydrogen and hydroxide ion concentrations:

Kw = $H⁺$ $OH⁻$ = 1.0 × 10⁻¹⁴ (at 25°C)

Example: To calculate $OH⁻$ when $H⁺$ is known, use $OH⁻$ = Kw / $H⁺$

For weak acids, the acid dissociation constant (Ka) is introduced:

Ka = $H⁺$ ² / $HA$

This leads to the formula for calculating hydrogen ion concentration in weak acid solutions:

$H⁺$ = √(Ka × $HA$ )

Vocabulary: pKa is the negative logarithm of Ka, expressed as pKa = -log₁₀Ka

The formula sheet also covers buffer solutions, which are crucial for Buffer Calculations A level Chemistry OCR:

For a buffer composed of a weak acid and its conjugate base salt:

$H⁺$ = Ka × $HA$ / $A⁻$

Highlight: The ICEE method is mentioned for pH calculations of buffers formed by mixing weak acids with bases, though the specific steps are not detailed on this sheet.

This comprehensive formula sheet serves as an excellent resource for students preparing for OCR A Level chemistry module 5 practice questions answers and tackling Acid and base calculations pdf problems. It covers the essential equations needed for a wide range of pH and buffer calculations, making it an invaluable tool for Pmt OCR A level Chemistry module 5 revision.

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Chemistry

•

305

•

27 Sept 2025

•

1 page

Fun with pH: Strong Acids, Bases, and Buffers Explained

Sophie

@sophie_rfgb

This PDF provides essential formulas and equations for calculating pH, concentrations, and equilibrium constants in acid-base chemistry. It covers strong acids, strong bases, weak acids, and buffer solutions.

Key points:

Formulas for pH calculation and relationship with [H+]
Equations for... Show more

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Formula Sheet for pH Calculations and Buffer Solutions

The sheet begins with the fundamental pH equation:

Definition: pH = -log₁₀ $H⁺$

This formula is the cornerstone of pH calculations, relating the hydrogen ion concentration to the pH value.

For strong acids, a simplified approach is provided:

Highlight: $H⁺$ = $acid$

This equality holds true for strong acids due to their complete dissociation in solution.

The sheet also includes the water dissociation constant (Kw) and its relationship with hydrogen and hydroxide ion concentrations:

Kw = $H⁺$ $OH⁻$ = 1.0 × 10⁻¹⁴ (at 25°C)

Example: To calculate $OH⁻$ when $H⁺$ is known, use $OH⁻$ = Kw / $H⁺$

For weak acids, the acid dissociation constant (Ka) is introduced:

Ka = $H⁺$ ² / $HA$

This leads to the formula for calculating hydrogen ion concentration in weak acid solutions:

$H⁺$ = √(Ka × $HA$ )

Vocabulary: pKa is the negative logarithm of Ka, expressed as pKa = -log₁₀Ka

The formula sheet also covers buffer solutions, which are crucial for Buffer Calculations A level Chemistry OCR:

For a buffer composed of a weak acid and its conjugate base salt:

$H⁺$ = Ka × $HA$ / $A⁻$

Highlight: The ICEE method is mentioned for pH calculations of buffers formed by mixing weak acids with bases, though the specific steps are not detailed on this sheet.

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Stefan S

iOS user

Samantha Klich

Android user

Anna

iOS user

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

Thomas R

iOS user

Basil

Android user

David K

iOS user

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

Rohan U

Android user

Xander S

iOS user

Elisha

iOS user

Paul T

iOS user

Stefan S

iOS user

Samantha Klich

Android user

Anna

iOS user

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

Thomas R

iOS user

Basil

Android user

David K

iOS user

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

Rohan U

Android user

Xander S

iOS user

Elisha

iOS user

Paul T

iOS user

Fun with pH: Strong Acids, Bases, and Buffers Explained

Formula Sheet for pH Calculations and Buffer Solutions

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Fun with pH: Strong Acids, Bases, and Buffers Explained

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Formula Sheet for pH Calculations and Buffer Solutions

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