(a) Solutions of soluble salts can react together to form an insoluble salt - Edexcel - GCSE Chemistry - Question 3 - 2014 - Paper 1

The missing state symbols are (s) for copper carbonate and (aq) for sodium nitrate. Thus the completed equation is:

The formula for copper carbonate is CuCO₃.

To obtain a pure, dry sample of lead iodide from the mixture, follow these steps:

1. Filter the mixture: Use filter paper and a funnel to separate the solid lead iodide from the liquid.
2. Wash the precipitate: Rinse the solid lead iodide on the filter paper with distilled water to remove impurities.
3. Dry the solid: Leave the lead iodide to dry completely.

This will give you a pure, dry sample of lead iodide.

The ion in salt X that gives the lilac flame is potassium (K⁺).

The ion in salt X that produces the white solid is chloride (Cl⁻).