SAT II Chemistry : Solutions

Study concepts, example questions & explanations for SAT II Chemistry

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Example Questions

Example Question #1 : Concentration And Units

30 mL of 1.0 M  \(\displaystyle HClO_{3}_{(aq)}\)  solution is diluted with water to a volume of 3 L. What is the new concentration of the solution?

Possible Answers:

\(\displaystyle 0.1\textup{\space M}\)

\(\displaystyle 10\textup{\space M}\)

\(\displaystyle 0.01\textup{\space M}\)

\(\displaystyle 0.3\textup{\space M}\)

\(\displaystyle 1\textup{\space M}\)

Correct answer:

\(\displaystyle 0.01\textup{\space M}\)

Explanation:

Recall that \(\displaystyle 1 L = 1000 mL.\) Thus, the volume of the solution increased from 30 mL to 3000 mL, which is a factor of 100. Thus, the new concentration must be 100 times less than the original concentration, and \(\displaystyle \frac{1 M}{100}=0.01 M\).

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