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3.3 Types of chemical reactions

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Question 18

A student dilutes 10 cm310\,\mathrm{cm^{3}}10cm3 of a strong acid solution to a total volume of 100 cm3100\,\mathrm{cm^{3}}100cm3 by adding water. Before dilution, the solution has a pH of 2 and a hydrogen ion concentration of 1×10−2 mol/dm31 \times 10^{-2}\,\mathrm{mol/dm^{3}}1×10−2mol/dm3.

a.

How many times smaller is the hydrogen ion concentration after dilution?

[1]
b.

Calculate the hydrogen ion concentration after dilution.

[1]
c.

State the pH of the diluted solution.

[1]
Markscheme

3.3 Types of chemical reactions Questions

  1. GCSE
  2. /Chemistry
  3. /3.3 Types of chemical reactions

112 exam-style questions on OCR GCSE Chemistry 3.3 Types of chemical reactions, covering 3.3.1 Oxidation and reduction in terms of oxygen, 3.3.2 Acids, alkalis and neutralisation, 3.3.3 The pH scale and measuring pH, 3.3.4 Oxidation and reduction in terms of electrons, 3.3.5 Dilute and concentrated, weak and strong acids, and 3.3.6 Hydrogen ion concentration and pH. Each one has a worked solution and a mark scheme showing where the marks go.

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