Magnesium hydroxide is only very slightly soluble in water. The reaction by which it goes into solution is: Mg(O H)2(s) ⇌ Mg2+(a q) + 2 O H minus (a q) What will happen if O H minus is added to the solution and why? Question options: Solid dissolves. O H minus concentration decreases. Reaction moves to the left. Solid remains. O H minus concentration decreases. Reaction moves to the left. Solid remains. O H minus concentration decreases. Reaction moves to the right. Solid dissolves. O H minus concentration increases. Reaction moves to the right. Solid dissolves. O H minus concentration decreases. Reaction moves to the right. Solid remains. O H minus concentration increases. Reaction moves to the right. Solid remains. O H minus concentration increases. Reaction moves to the left. Solid dissolves. O H minus concentration increases. Reaction moves to the left.