Magnesium Hydroxide Is Used in Several Antacid Formulations $\degree$ C Is 89 *10¯¹²

question 45

Multiple Choice

Magnesium hydroxide is used in several antacid formulations. When it is added to water it dissociates into magnesium and hydroxide ions. The equilibrium constant at 25 $\degree$ 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?

• A) The hydroxide ion concentration will decrease.
• B) The hydroxide ion concentration will increase.
• C) The hydroxide ion concentration will be unchanged.
• D) The solution will become supersaturated.
• E) None of these conclusions is justified without additional information.

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