Making Insoluble Salts
Chemistry: Edexcel IGCSE, topic 12.1.9
Making Insoluble Salts From 2 Soluble Reactants
We can produce insoluble salts from two soluble reactants. First you must mix the two soluble reactants together. A precipitate (insoluble solid) will form. We use symbol equations, so state symbols can show if an insoluble solid is made.
Lead iodide
- If a reaction produces an insoluble solid, it is called a precipitate.
- E.g. 2KI(aq) + Pb(NO3)2(aq) → PbI2(s) + 2KNO3(aq).
- Lead iodide is a precipitate.
- To obtain the insoluble salt, you need to filter the products using filter paper.
Silver chloride
- If a reaction produces an insoluble solid, it is called a precipitate.
- E.g. NaCl(aq) + AgNO3(aq) → NaNO3(aq) + AgCl(s).
- Silver chloride is a precipitate.
- To obtain the insoluble salt, you need to filter the products using filter paper.
Test yourself on Making Insoluble Salts
Which of these symbols shows that a precipitate has been formed?