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VICChemistryQuick questions

Unit 2: How do chemical reactions shape the natural world?

Quick questions on Strong vs weak acids and bases, Ka and Kb: VCE Chemistry Unit 2

6short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is strong is not the same as concentrated?
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Strong vs weak describes the extent of ionisation. Concentrated vs dilute describes the amount per litre. These are independent. A weak acid can be concentrated (glacial ethanoic acid is 17 mol L−117\ mol\ L^{-1} and still weak).
What is the acid ionisation constant Ka?
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For the general weak-acid ionisation HA+H2O⇌H3O++A−HA + H_2O \rightleftharpoons H_3O^+ + A^-, the equilibrium constant (with water activity absorbed into KaK_a) is:
What is the base ionisation constant Kb?
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For a weak base B+H2O⇌BH++OH−B + H_2O \rightleftharpoons BH^+ + OH^-:
What is q1?
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Distinguish between a "strong" acid and a "concentrated" acid, giving one example of each. [2 marks]
What is q2?
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A 0.100 mol/L0.100 \, \text{mol/L} solution of a monoprotic weak acid has pH =3.20= 3.20. (a) Calculate [H+][\text{H}^+]. (b) Determine KaK_a.
What is q3?
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Ethanoic acid has Ka=1.74×10−5K_a = 1.74 \times 10^{-5}. (a) Calculate pKapK_a. (b) Calculate KbK_b for its conjugate base, ethanoate.

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