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Subject Test Chemistry

Question 4 of 13

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SAT Subject Test

The set of lettered choices below refers to multiple questions. Select the one lettered choice that best fits each statement or answers each question. A choice may be used once, more than once, or not at all in each set.

Is weakly acidic

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0.1 text   end text M space text HCl end text

Correct Answer: 
No

0.1 text   end text M space text NaCl end text

Correct Answer: 
No

0.1 text   end text M space text HC end text subscript 2 text H end text subscript 3 text O end text subscript 2

Correct Answer: 
Yes

0.1 text   end text M space invisible times text CH end text subscript 3 text OH end text

Correct Answer: 
No

0.1 text   end text M space text KOH end text

Correct Answer: 
No

To answer this question, you must recognize which of the choices above are acid solutions. Only choices (A) and (C) satisfy this requirement. Choice (B) refers to a neutral salt solution, choice (D) is a solution of an alcohol, and choice (E) is a basic solution. Choices (A) and (C) are both acidic solutions, but choice (A) is a strong acid that is completely ionized in aqueous solution, whereas choice (C) is only partially ionized in aqueous solution. Since the concentrations of all the solutions are the same, you do not need to consider this factor. The hydrogen ion concentration of a 0.1 molar acetic acid solution is considerably smaller than 0.1 molar. The hydrogen ion concentration in choice (A) is equal to 0.1 molar. Thus, the correct choice is choice (C), a weakly acidic solution.

Question Difficulty: 
easy