Practice Quiz

MCAT Chemistry

Category - Multiple Choice

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What volume of .250 M potassium hydroxide is needed to neutralize 1.25 liters of .500 M hydrochloric acid?
  1. 2.50 liters
  2. 1.25 liters
  3. .625 liters
  4. .375 liters
  5. 5.0 liters
Explanation
Answer: 2.50 Liters

Hydrochloric acid (HCl) is a strong, monoprotic acid. Potassium hydroxide (KOH) is a strong base that contains one hydroxide anion per molecule. The concentrations and volumes of these solutions are related by the formula (Molarity1)(Volume1) = (Molarity2)(Volume2). Entering the variables into this equation gives (.250 M)(Volume1) = (.500 M)(1.25 liters). Solve for Volume1 to find the correct answer, 2.5 liters.
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