GCSE Edexcel Chemistry Making soluble salts: The table shows some salts that

Question

The table shows some salts that are soluble and some that are insoluble in water.

(a) An insoluble salt can be prepared by mixing two salt solutions.

Choose two salts from the table that can be reacted together to form lead carbonate.

____________ and ____________

(b) Barium chloride solution reacts with copper sulfate solution.

barium chloride + copper sulfate → barium sulfate + copper chloride

Explain what is seen when solutions of barium chloride and copper sulfate are mixed.

(c) A ‘barium meal’ may be given to a patient before an X-ray is taken. A ‘barium meal’ is a suspension of barium sulfate in water.

Give one reason why barium sulfate is used in this way.

(d) Complete the sentences by putting a cross (X) in the box next to your answer.

(i) The table shows that copper chloride is soluble in water.

This suggests that the structure of copper chloride is

☐ A simple molecular, covalent
☐ B giant molecular, covalent
☐ C ionic
☐ D metallic

(ii) Sodium carbonate is an ionic compound.

The most likely melting point of sodium carbonate is

☐ A -85 °C
☐ B 17 °C
☐ C 146 °C
☐ D 851 °C

(e) Sodium carbonate contains sodium ions, Na+, and carbonate ions, CO3^2−.

Give the formula for sodium carbonate.

The table shows some salts that are soluble and some that are insoluble in water - Edexcel - GCSE Chemistry - Question 2 - 2012 - Paper 1