Question

Part A

Consider a buffer solution that is 0.50 M in NH3 and 0.20 M in NH4Cl. For ammonia, pKb=4.75.​

Calculate the pH of 1.0 L of the original buffer, upon addition of 0.190 mol of solid NaOH.

Part B

A 1.0-L buffer solution contains 0.100 mol HC2H3O2 and 0.100 mol NaC2H3O2. The value of Ka for HC2H3O2 is 1.8×10−5.​

Calculate the pH of the solution, upon addition of 0.030 mol of NaOH to the original buffer.

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