Jan 2020 NY Regents Chemistry Exam
47 In a titration, 10.0 mL of 0.0750 M HCl(aq) is exactly neutralized by 30.0 mL of KOH(aq) of unknown concentration. What is the concentration of the KOH(aq) solution? (1) 0.0250 M
(2) 0.0750 M
(3) 0.225 M
(4) 0.333 M
Solution: Table T on the Reference Table has the formula for titration which is MaVa = MbVb where Ma = molarity of H+, Mb = molarity of OH–, Va = volume of acid, Vb = volume of base. We are given: Va = 10.0 mL, Ma = 0.0750 M, Vb = 30.0 mL, Mb = ? Now, all we have to do is plug the values into the equation and solve for Mb.
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