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2.3 Ionic bonding

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Question 5
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Potassium sulfate is used as a fertiliser. It contains potassium ions, K+\mathrm{K^{+}}K+, and sulfate ions, SO42−\mathrm{SO_{4}^{2-}}SO42−​.

a.

Give the formula of potassium sulfate.

[1]
b.

Another fertiliser is potassium phosphate, K3PO4\mathrm{K_{3}PO_{4}}K3​PO4​. Deduce the charge on a phosphate ion.

[1]
c.

Calculate the relative formula mass (MrM_{r}Mr​) of potassium sulfate. Relative atomic masses: K = 39, S = 32, O = 16

[2]
d.

A farmer uses 87.0 g of potassium sulfate. Calculate the amount, in moles, of potassium sulfate in 87.0 g.

[1]
e.

Calculate the total number of ions in 87.0 g of potassium sulfate. Avogadro constant = 6.02 × 1023 per mol

[2]
Markscheme

2.3 Ionic bonding Questions

  1. GCSE
  2. /Chemistry
  3. /2.3 Ionic bonding

56 exam-style questions on Edexcel GCSE Chemistry 2.3 Ionic bonding, covering 2.3.1 Ions and the formation of ionic bonds, 2.3.2 Naming and deducing formulae of ionic compounds, and 2.3.3 Giant ionic lattices. Each one has a worked solution and a mark scheme showing where the marks go.

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