A buffer is prepared from 150 mL 0.185 M NH4Cl (aq) and 200.0 mL 0.105 M NH3. Kb for NH3 is 1.8X 10^-5 Write the equilibrium expression and corresponding Ka expression for the buffer. Calculate the initial pH of the buffer. 3. Assuming the volume does not change, calculate the pH of the buffer after the addition of 255 mg NaOH (s). .

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Q: Question attached

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A: Since you have posted multiple questions, we are entitled to answer the first only.

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