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You wish to make a buffer that will have a ratio of [Ind-]/[HInd] of 0.20 with...

You wish to make a buffer that will have a ratio of [Ind-]/[HInd] of 0.20 with thymol blue (pKa=8.9). Using solid ammonium chloride (Kb of NH3 = 1.8 x 10-5) and 1.0 M NaOH, how will you make 250.0 mL of a buffer solution that will have the desired pH where [HA]+[A-] = 0.20 M?

Already solved that the desired pH = 8.2.

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