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I have already figured out part a. I need help with b and c. thank you.

38. A buffer solution is 0.40 M NH3 and 0.60 M NH4CI. Kb for NH3 is 1.8 x 10-5 a) Calculate the pH for the buffer system. pH
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Answer #1

Here Ph will not change but as we know, Buffer solution as a solution whose ph doesnot change by adding small quantity of acid or base.

In part b, bases is added so ph will remain same as the part a

In part c, acid is added so here also ph remain same.

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