Question

List at least two chemical reactions that resulted in a white precipitate. For these reactions list the possible chemical name of the precipitate. What do these reactions (and the others with white precipitates) have in common?

Answer 1

barium chloride + sodium sulphate --> barium sulphate + sodium chloride
BaCl2 + Na2SO4 ---> BaSO4 + 2 NaCl
The barium sulphate appears as a white precipitate

Silver nitrate + Sodium chloride ---> Silver Chloride + sodium nitrate
AgNO3 + NaCl ----> AgCl + NaNO3
The silver chloride appears as a white precipitate.

These are sometimes called double decomposition reactions.