Question- you needs to produce a buffer solution that has a, Chemistry

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Question- you needs to produce a buffer solution that has a

Question- You needs to produce a buffer solution that has a pH of 5.03. You already have a solution that contains 10. mmol (millimoles) of acetic acid. How many millimoles of acetate (the conjugate base of acetic acid) will you need to add to this solution? The pKa of acetic acid is 4.74.

State your answer numerically in millimoles.

Please illustrate all work I thought that it would be 19.50 but it isn't

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