Question

Add potassium chromate (K₂CrO₄) into the solution of barium sulphate (BaSO₄).

1. What was the colour of the precipitate formed? Also, write the name of the precipitate.
2. Write down the balanced equation for this reaction.
3. Will you call this reaction a displacement reaction or a double displacement reaction? Why?

Answer 1

1. Yellow precipitate of barium chromate.
2. \[\ce{K2CrO4 + BaSO4 -> BaCrO4 + K2SO4}\]
3. This is a double displacement reaction. The reaction in which the ions in the reactants are exchanged to form a precipitate is a double displacement reaction.