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Subject Test Chemistry

Question 9 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.

The hydrogen ion concentration of a solution prepared by diluting 50. text    end text text mL end text of 0.10 M text HNO end text text end text subscript 3 end subscript left parenthesis a q right parenthesis with water to 500. m L of solution is

Select an Answer

0.0010 invisible times text   end text space M

Correct Answer: 
No

0.0050 invisible times text    end text space M

Correct Answer: 
No

0.010 invisible times text   end text space M

Correct Answer: 
Yes

0.050 invisible times text   end text space M

Correct Answer: 
No

1.0 invisible times text   end text space M

Correct Answer: 
No

This is a question that concerns the concentration of a diluted solution. One way to solve the problem is through the use of ratios. In this question, a solution of nitric acid is diluted 10-fold; therefore, the concentration of the solution will decrease by a factor of 10, that is, from 0.100 molar to 0.010 molar. Alternatively, you could calculate the number of moles of text H end text to the power of plus end exponent ions present and divide this value by 0.50 liter: left parenthesis 0.100 cross times 0.050 right parenthesis divided by 0.5 equals M of the diluted solution.

Question Difficulty: 
medium