An Environmental Chemist Obtained a 200

Multiple Choice

An environmental chemist obtained a 200. mL sample of lake water believed to be contaminated with a single monoprotic strong acid. Titrating this sample with a 0.0050 M NaOH(aq) required 7.3 mL of the NaOH solution to reach the endpoint. What is the concentration of H⁺ in the lake

A) 1.8 * 10^-4 M
B) 2.0 * 10^-4 M
C) 2.2 * 10^-4 M
D) 2.4 * 10^-4 M
E) None of the above