magnesium hydroxide is very slightly soluble in water. the reaction by which it

Question

magnesium hydroxide is very slightly soluble in water. the reaction by which it goes into solution is Mg (OH)2(s) Mg2+(aq) +2 OH-(aq).

what will happen if H+ is added to the solution and why?

a)Solid dissolves. OH- concentration increases. reaction moves to the left
b)Solid dissolves. OH- CONCENTRATION DECREASES. reaction moves to the left
c)solid dissolves. OH-concentration decreases. reaction moves to the right
d)solid remains. OH- concentration decreases reaction moves to the left
e)solid dissolves. OH- concentration increases reaction moves to the right
f)solid remains. OH- concentration decreases. reaction moves to the right
g)solid remains. OH- concreation increases, reaction moves to the left
h)solid remains. OH-concentration increases. reaction moves to the right

Explanation / Answer

when H+ is added to the solution, it will react with OH-

Thus for equilibrium,

Mg (OH)2(s) Mg2+(aq) +2 OH-(aq)

[OH-] is decreasing.

According to LeChatellier’s principle, the equilibrium will shift to product side and hence more Mg(OH)2 will dissolve.

Answer:

c)solid dissolves. OH-concentration decreases. reaction moves to the righ

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