Question 192135

1. A one-liter buffer solution was made of ammonia (0.33 M)-

ammonium chloride (0.33 M) at equilibrium. A student was asked

to add 0.05 mol HCl to that solution. However, he mistakenly

added 0.07 mol NaOH to that solution. Assume no change in the

volume of the buffer.

(a) What type of buffer solution it was. Provide its mechanism.

(b) Calculate the change of pH of the buffer after the mistake of the


(c) What would be the change of pH if the student adds 1000 mL

water to that buffer solution?

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