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3.3 Types of chemical reactions

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Question 8

A technician prepares two acid solutions.

SolutionAcidStrengthConcentration in mol/dm3\mathrm{mol/dm^{3}}mol/dm3pH
Pnitric acidstrong1.0 × 10-33
Qcitric acidweak1.0 × 10-12
a.

Calculate how many times greater each of these is in solution Q than in solution P:

  • the amount of acid in each dm3\mathrm{dm^{3}}dm3
  • the hydrogen ion concentration.
[2]
b.

Explain why the acid concentrations and hydrogen ion concentrations do not differ by the same factor.

[2]
c.

The technician dilutes solution P tenfold with water. Solution Q is unchanged.

Predict the new pH of solution P and compare its new hydrogen ion concentration with that of solution Q.

[2]
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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