A Buffer Solution Is Made Such That the Initial Concentrations

question 91

Multiple Choice

A buffer solution is made such that the initial concentrations of lactic acid (HC₃H₅O₃ ) and the lactate ion (C₃H₅O₃-) are 0.600 M and 0.620 M, respectively.What is the resulting pH if 100.0 mL of 0.100 M potassium hydroxide is added to 0.500 L of the buffer solution? (The K_a of HC₃H₅O₃ is 1.4 * 10^-4.)

• A)3.81
• B)3.90
• C)2.75
• D)4.96
• E)3.85

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