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2 marksAcid/Base Equilibria

CAPE Chemistry Unit 1 · 2014 · Paper 2 · Question 2(b)(ii)

25 cm³ of 0.1 mol dm⁻³ hydrochloric acid is titrated with 0.1 mol dm⁻³ of aqueous ammonia.

Suggest an indicator, giving a reason for your choice.

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Other parts of this question

  1. 2(a)(i)State the Brønsted-Lowry theory of acids and bases.[1 mark]
  2. 2(a)(ii)Distinguish between a 'strong acid' and a 'weak acid'.[2 marks]
  3. 2(b)(i)In the space below, sketch the curve which is expected to illustrate the changes that take place during titration.[2 marks]
  4. 2(c)(i)Deduce the order of the reaction.[1 mark]
  5. 2(c)(ii)Calculate the rate constant for the decomposition.[2 marks]
  6. 2(d)(i)Magnesium filings were added to the remaining solution at 2(c). What observation is expected?[1 mark]
  7. 2(d)(ii)Outline an alternative experimental method to determine the rate of decomposition of HOX at room temperature.[4 marks]

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