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Question 2

A student investigates the rate of a reaction that is first-order with respect to nitric acid, HNO3(aq)\text{HNO}_3\text{(aq)}HNO3​(aq).

  • The student carries out a reaction using 0.750 mol dm−3 HNO3(aq)0.750\text{ mol dm}^{-3}\text{ HNO}_3\text{(aq)}0.750 mol dm−3 HNO3​(aq). The initial rate is 1.20×10−3 mol dm−3 s−11.20 \times 10^{-3}\text{ mol dm}^{-3}\text{ s}^{-1}1.20×10−3 mol dm−3 s−1.
  • The student dilutes a different sample of 0.750 mol dm−3 HNO3(aq)0.750\text{ mol dm}^{-3}\text{ HNO}_3\text{(aq)}0.750 mol dm−3 HNO3​(aq). The pH of this diluted acid is 1.401.401.40.
  • The student repeats the reaction using the same volume of this diluted acid.

Determine the initial rate of the reaction using this diluted acid. Give your answer to 3 significant figures.

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How fast? Questions

  1. A Level
  2. /Chemistry
  3. /How fast?

29 exam-style questions on OCR A A Level Chemistry How fast?. Each one has a worked solution and a mark scheme showing where the marks go.

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