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5.1 Monitoring chemical reactions

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Question 21
H

A metal hydroxide has the formula MOH, where M is a Group 1 metal.

A student dissolves 5.61 g of MOH in water to make 1.00 dm3\mathrm{dm^{3}}dm3 of solution.

25.0 cm3\mathrm{cm^{3}}cm3 of this solution is exactly neutralised by 20.00 cm3\mathrm{cm^{3}}cm3 of 0.125 mol/dm3\mathrm{mol/dm^{3}}mol/dm3 hydrochloric acid.

MOH+HCl→MCl+H2O \mathrm{MOH + HCl \rightarrow MCl + H_{2}O} MOH+HCl→MCl+H2​O

Relative atomic mass (ArA_rAr​): H = 1.0 Li = 6.9 O = 16.0 Na = 23.0 K = 39.1 Rb = 85.5

What is metal M?

[1]
A

Lithium

B

Sodium

C

Potassium

D

Rubidium

Markscheme

5.1 Monitoring chemical reactions Questions

  1. GCSE
  2. /Chemistry
  3. /5.1 Monitoring chemical reactions

57 exam-style questions on OCR GCSE Chemistry 5.1 Monitoring chemical reactions, covering 5.1.1 The technique of titration, 5.1.2 Theoretical mass, percentage yield and atom economy, 5.1.3 Concentration of a solution in mol/dm3, 5.1.4 Concentration calculations and titration results, 5.1.5 Molar gas volume and volumes of gases in reactions, and 5.1.6 Choosing a reaction pathway. Each one has a worked solution and a mark scheme showing where the marks go.

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