Magnesium hydroxide is used in several antacid formulations. When it is added to water it dissociates into magnesium and hydroxide ions.
Mg(OH)2(s) Picture Mg2+(aq) + 2OH¯(aq)
The equilibrium constant at 25°C is 8.9 × 10¯12. One hundred grams of magnesium hydroxide is added to 1.00 L of water and equilibrium is established. What happens to the solution if another 10 grams of Mg(OH)2 are now added to the mixture?