On adding sodium hydroxide solution to a salt solution, a white precipitate is formed that dissolves in excess sodium hydroxide. The same white precipitate is obtained with ammonium hydroxide and it also dissolves in excess ammonium hydroxide. Identify the cation present and write the formula of the precipitate.

State what is observed when ammonium hydroxide solution is added, first a little and then in excess, to a solution of copper(II) sulphate.

A white precipitate is formed when sodium hydroxide is added to a salt solution, and it does not dissolve in excess. Name the cation and state one further test.

A salt solution gives a dirty green precipitate with sodium hydroxide solution, insoluble in excess. Identify the cation and write the equation for the reaction.

A salt solution gives a white precipitate with sodium hydroxide solution which dissolves in excess to give a colourless solution. Identify the two cations this could be and state how ammonium hydroxide distinguishes between them.

Name the gas evolved when sodium hydroxide solution is warmed with an ammonium salt, and state how it is identified.

State the observations when sodium hydroxide solution is added, first a little and then in excess, to zinc sulphate solution, and write the equations.