Question

When looking at the equilibrium between silver bromide and its aqueous ions, what could be added to solution to promote precipitation of silver bromide?

Answer 1

NaBr

Step-by-step explanation:

When AgBr is dissolved in water, the following equilibrium is set up in solution;

AgBr(s)⇄Ag^+(aq) + Br^- (aq)

If we dissolve NaBr in the water, a common ion (Br^-) is now introduced into the system. This increases the concentration of Br^- and favours the reverse reaction hence more AgBr is precipitated. This is known as common ion effect.