Acids, Bases and pH (OCR A-Level Chemistry A): Flashcards

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The pH of Weak Acids
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Strong acid dissociation in aqueous solution

Complete dissociation

Weak acid dissociation in aqueous solution

Partial dissociation

What weak acids establish in solution

Equilibrium

Ratio of H+\text{H}^+ to A−\text{A}^- in weak acid dissociation

Equal quantities

Simplified KaK_\text{a} expression for weak acids

Ka=[H+]2[HA]K_\text{a} = \frac{[\text{H}^+]^2}{[\text{HA}]}

Formula for [H+][\text{H}^+] in weak acid solutions

[H+]=Ka×[HA][\text{H}^+] = \sqrt{K_\text{a} \times [\text{HA}]}

Formula to calculate pH from [H+][\text{H}^+]

pH=−log⁡10[H+]\text{pH} = -\log_{10}[\text{H}^+]

pH value when approximation 1 breaks down

pH > 6

KaK_\text{a} value when approximation 2 breaks down

Ka>10−2K_\text{a} > 10^{-2} mol dm−3^{-3}

Steps to determine KaK_\text{a} experimentally

Prepare standard solution and measure pH

Explore OCR A-Level Chemistry A Revision Notes by Topics

Rates of Reactions

Equilibrium

Acids, Bases and pH

Buffers and Neutralisation

Enthalpy and Entropy

Redox and Electrode Potentials

Transition Elements

Explore OCR A-Level Chemistry A Model Answers by Topics

Rates of Reactions

Equilibrium

Acids, Bases and pH

Buffers and Neutralisation

Enthalpy and Entropy

Redox and Electrode Potentials

Transition Elements

Explore OCR A-Level Chemistry A Quizzes by Topics

Rates of Reactions

Equilibrium

Acids, Bases and pH

Buffers and Neutralisation

Enthalpy and Entropy

Redox and Electrode Potentials

Transition Elements

Explore OCR A-Level Chemistry A Exam Questions by Topics

Rates of Reactions

Equilibrium

Acids, Bases and pH

Buffers and Neutralisation

Enthalpy and Entropy

Redox and Electrode Potentials

Transition Elements

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