Question

Will magnesium bromide and sodium hydroxide give a precipitate when mixed?

Answer 1

$2NaOH_{(aq)} +MgBr_2{(aq)}\to 2NaBr_{(aq)} +Mg(OH)_2{(s)}$

Net ionic equation of this reaction is:

$2OH^-_{(aq)} +Mg^{2+}_{(aq)} \to Mg(OH)_2{(s)}$

From the above equation the insoluble $Mg(OH)_2$ is formed in this reaction, which is a precipitate.