14
AssignmentMultiple Choice

Lab: Solubility

Question 14 • *26-27 CFISD TX-Chemistry A CR

Which statement best explains how the solution should be made?

Answer
A
Add 1.5 mL of 0.50 M H2SO4 to 10.5 mL of water to get 12 mL of 4 M H2SO4.
B
Add 1.5 mL of 4.00 M H2SO4 to 10.5 mL of water to get 12 mL of 0.50 M H2SO4.
C
Add 1.5 mL of 4.00 M H2SO4 to 12 mL of water to get 0.50 M H2SO4.

Explanation

Use the dilution relationship: the amount of H2SO4 stays the same when water is added. Adding 1.5 mL of 4.00 M H2SO4 provides 4.00 × 1.5 = 6.0 mmol; in a total volume of 12 mL, that gives 6.0 ÷ 12 = 0.50 M. So the solution should be made by adding 1.5 mL of 4.00 M H2SO4 to 10.5 mL of water.

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