Question

1. Predict how the solubility of iron(III) nitrate will change in response to each of the following stressors. Provide explanations for your answers.

Fe(NO3)3 (s) ⇌ Fe+3(aq) + 3 NO3−(aq)

1. The pH of the solution is decreased. 

1. Mg(NO3)2 is added to the solution. 

Answer 1

1. pH does not impact this equilibrium. Its deacrease does not shift the balance.
2. Mg(NO₃)₂ is added to the solution increases the concentration of NO₃^/ ions in the equilibrium. Therefore, spead of a direct reaction slows down.