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Subject Test Chemistry

Question 2 of 17

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SAT Subject Test

Each of the questions or incomplete statements below is followed by five suggested answers or completions.  Select the one that is best in each case.

To determine whether a water solution of text Na end text subscript 2 end subscript text S end text subscript 2 end subscript text O end text subscript 3 end subscript at room temperature is supersaturated, one can

Select an Answer

heat the solution to its boiling point

Correct Answer: 
No

add water to the solution

Correct Answer: 
No

add a crystal of text Na end text subscript 2 text S end text subscript 2 text O end text subscript 3 to the solution

Correct Answer: 
Yes

acidify the solution

Correct Answer: 
No

cool the solution to its freezing point

Correct Answer: 
No

The other options describe processes that would not enable you to determine whether or not the solution was supersaturated: you would observe the same thing either way. Supersaturated solutions are not stable. If you add more solute (in this case the crystal) to a supersaturated solution, the extra solute will precipitate out of the solution, indicating that the solution was indeed supersaturated.

Question Difficulty: 
easy