2019 U.S. National Chemistry Olympiad Local Section Exam Question 5

Which of the following combinations will produce a 0.4 M NaCl solution?

(A) Mixing 500 mL of 0.4 M NaOH with 500 mL of 0.4 M HCl
(B) Mixing 300 mL of 1.2 M NaOH with 600 mL of 0.6 M HCl
(C) Mixing 500 mL of 0.4 M NaCl solution with 500 mL water
(D) Diluting 400 mL of 0.6 M NaCl with water to a final volume of 1.0 L

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Test ID: 1868