Prepare insoluble salt

What type of reaction is used to prepare an insoluble salt

A precipitation reaction.

Why must the salt formed be insoluble in water

So that it forms a solid precipitate that can be separated.

What is the general equation for preparing an insoluble salt

Soluble salt 1 + Soluble salt 2 ⟶ Insoluble salt + Soluble salt 3.

What is the ionic equation pattern for the reaction

AB + CD ⟶ AD + CB.

How is the reaction carried out

Measure a fixed volume of one salt solution and add the other in slight excess.

Why is one solution added in excess

To ensure the maximum amount of precipitate is formed.

How is the precipitate collected

By filtration.

Why is the precipitate washed with distilled water

To remove any remaining soluble reactants contaminating the solid.

What is done after washing the precipitate

It is left to dry.

What are examples of salts commonly prepared by this method

Silver and lead(II) salts.

Why are nitrates often used as starting materials

Because all nitrates are soluble.