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4 marksAcid/Base Equilibria

CAPE Chemistry Unit 1 · 2016 · Paper 2 · Question 2(b)(iii)

In aqueous solution, carbonic acid forms a weak acidic solution containing the hydrogen carbonate ion.

Calculate the pH of a 0.100 mol dm⁻³ aqueous solution of carbonic acid. (Kₐ = 4.5 × 10⁻⁷ mol dm⁻³ at 25 °C.)

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Other parts of this question

  1. 2(a)(i)Define EACH of the following terms: Weak acid[1 mark]
  2. 2(a)(ii)Define EACH of the following terms: Kₐ[2 marks]
  3. 2(b)(i)Write an equation to represent the dissociation of carbonic acid in aqueous solution.[2 marks]
  4. 2(b)(ii)Write the Kₐ expression for the reaction in (b) (i).[1 mark]
  5. 2(c)A student was given a particular brand of club soda (carbonated beverage) to determine the carbonic acid content. Outline the experimental steps required for…[5 marks]

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