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Amount of substance

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Question 20

A laboratory technician is preparing a standard solution of sodium thiosulfate (Na2S2O3\text{Na}_2\text{S}_2\text{O}_3Na2​S2​O3​) for an iodometric titration. The technician starts with 25.0 cm3 of a 1.80 mol dm-3 stock solution and needs to dilute it to a concentration of 0.150 mol dm-3.

What volume of distilled water should the technician add to the stock solution?

A

300 cm3300\text{ cm}^3300 cm3

B

325 cm3325\text{ cm}^3325 cm3

C

275 cm3275\text{ cm}^3275 cm3

D

2975 cm32975\text{ cm}^32975 cm3

Markscheme

Amount of substance Questions

  1. A Level
  2. /Chemistry
  3. /Amount of substance

79 exam-style questions on AQA A Level Chemistry Amount of substance, covering Relative atomic mass and relative molecular mass, The mole and the Avogadro constant, The ideal gas equation, Empirical and molecular formula, and Balanced equations and associated calculations. Each one has a worked solution and a mark scheme showing where the marks go.

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