Question

a buffer solution is 0.2M in acetic acid and in sodium acetate. Calculate the change in pH upon adding 1.0ml of 0.1M hydrochloric acid to 10ml of this solution.(Given pKA of acetic acid is 4.76)
Help me a little by telling me what you don't understand.
Calculate millimols HAc and mmols NaAc and plug into the HH equation and solve for pH.
Then use an ICE chart, add the mmoles HCl and complete the E line of the ICE table. Then plug into the HH equation again and solve for pH.

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