consider equilibrium equation below

Question

`Mg(NO3)2(aq) + 2Na(OH)(aq) <--> Mg(OH)2(s) + 2NaNO3 (aq)

If NH3 is added, according to Le Chatelier's Principle, which way would reaction shift?

Answer 1

I would think the rxn is amost at 100% now; however, adding more OH^- (from NH3 + H2O ==> NH4^+ + OH^-) would add more OH to the left, the rxn would need to try to reduce the OH^- and it can do that by forming more Mg(OH)2(s). So to the right.