Milk of magnesia is a brand name for a commercial antacid. The active ingredient
ID: 956473 • Letter: M
Question
Milk of magnesia is a brand name for a commercial antacid. The active ingredient is Mg(OH)_2- In water, a small amount of Mg(OH)_2 dissolves producing a cloudy solution, e equilibrium reaction is Mg(OH)_2(S, white) Mg^2+(aq) + 2OH^- (aq) A. What observations would you see, if a small amount of concentrated HC1 was added to an equilibrium mixture of Mg(OH)_2 in water? Write the net ionic equation for the reaction that occurs in part A. Explain your observations in terms of Le Chatelier's Principle.Explanation / Answer
A)
if you add HCl to Mg(OH)2 you will expect neutralization, you will see that the solid precipitate dissapears ( since it form H2O and the equilibrium shift toward Mg(OH)2 in water)
B)
Mg(OH)2(aQ) + 2HCl(aq) = MgCl2(aq) + 2H2O(l)
net ionic
2OH-(aq) + 2H+(aq) = 2H2O(l)
C)
in terms of le chatelier
since OH- ions decrease
Mg(OH)2(s) <--> Mg+2 and 2OH-
the shift goes to the right, meaning solid is going into solution, solid decreases