Problem- you need to prepare 100 ml of a ph400 buffer, Chemistry

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Problem- you need to prepare 100 ml of a ph400 buffer

Problem- you need to prepare 100 mL of a pH=4.00 buffer solution using .100 M benzoic acid (pKa = 4.20) and .160 M sodium benzoate

How Much of each solution should be mixed to prepare this buffer?

Any help is greatly appreciated!

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Chemistry: Problem- you need to prepare 100 ml of a ph400 buffer

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