The popular antacid, Milk of Magnesia, is a suspension of magnesium hydroixde. I
ID: 850958 • Letter: T
Question
The popular antacid, Milk of Magnesia, is a suspension of magnesium hydroixde. In water, Mg(OH)2 undergoes the reaction Mg(OH)2(s) --> Mg2+(aq) + 2 OH-(aq). When a student added HCl (stomach acid) to the reaction mixture, it went from a cloudy solid/liquid mixture to a clear liquid. How is this observation consistent with Le Chatelier's Principle? Choose the best answer.
Question 5 options:
The Cl- from the dissociation of HCl increases the concentration of NaCl which is a soluble salt, and so the solution becomes clear.
The H+ from the dissociation of HCl increases the acidity of the solution. Because acids are soluble, the solution becomes clear.
The H+ from the dissociation of HCl reacts with the OH- to form water. The OH- concentration decreases and so the reaction shifts right to replace the loss.
The H+ from the dissociation of HCl reacts with OH- to form water. Because there is more water in the mixture, it looks clear.
A)The Cl- from the dissociation of HCl increases the concentration of NaCl which is a soluble salt, and so the solution becomes clear.
B)The H+ from the dissociation of HCl increases the acidity of the solution. Because acids are soluble, the solution becomes clear.
C)The H+ from the dissociation of HCl reacts with the OH- to form water. The OH- concentration decreases and so the reaction shifts right to replace the loss.
D)The H+ from the dissociation of HCl reacts with OH- to form water. Because there is more water in the mixture, it looks clear.
Explanation / Answer
The H+ from the dissociation of HCl increases the acidity of the solution. Because acids are soluble, the solution becomes clear.
B)The H+ from the dissociation of HCl increases the acidity of the solution. Because acids are soluble, the solution becomes clear.
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