# (SOLVED) A buffer solution is prepared by mixing 350. mL of 0.650 M HC2H2IO2 with 475 mL of 0.425 M NaC2H2IO2. What mass of KOH can be added to this solution before the pH is greater than 3.565?

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Question

A buffer solution is prepared by mixing 350. mL of 0.650 M HC2H2IO2 with 475 mL of 0.425 M NaC2H2IO2.

What mass of KOH can be added to this solution before the pH is greater than 3.565?

The Ka for HC2H2IO2 is 6.60 x 10-4.

Expert Solution Preview

For solving the given problem, the Henderson-Hasselbalch equation was going to use which relates the pH of a buffer solution to the pKa of the weak acid and the concentrations of the weak acid and its conjugate base: pH = pKa + log([A-]/[HA]) where pH = desired pH, pKa = the dissociation constant of the weak acid (HC2H2IO2), [A-] = the concentration of the conjugate base (C2H2IO2-), and [HA] = the concentration of the weak acid (HC2H2IO2).

First we have to calculate the initial concentrations of HC2H2IO2 and C2H2IO2- in the buffer solution by using the volumes and molarities given: [HC2H2IO2] =..............