Exhibit 16-1 the Following Question(s) Pertain to the Sequence of Events

question 21

Multiple Choice

Exhibit 16-1 The following question(s) pertain to the sequence of events below:
Part A: A student prepares a saturated solution of Mg(OH) ₂ by placing 200.0 grams of Mg(OH) ₂ in a large beaker and adding 2 liters of water. There is a considerable amount of undissolved magnesium hydroxide in the bottom of the beaker. The student records the pH and then adds another liter of water to the beaker. There is still some solid in the bottom of the beaker.
Part B: The student then adds 500 ml of 0.5 M HCl to the beaker from Part A. He notices that there is slightly less precipitate in the bottom of the beaker.  
Part C: The student then adds 800 ml of 12 M HCl to the beaker from Part B. He notices that the precipitate dissolves.
Refer to Exhibit 16-1, Part C. When he re-measures the pH he finds that

• A) the pH went down.
• B) the pH went up.
• C) the pH is unchanged.
• D) Not enough information to answer the question.

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