What volumes of the 0.10 m ha and 0.10 m naa solution, Ask an Expert

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Formic acid (HA) has a Ka value of 1.8 x 10^-4. A student needs t prepare 20.0 mL of a buffer with pH=3.60 from stock solutions of 0.10 M HA and 0.10 M NaA (where "A-" represents the formate ion). What volumes of the 0.10 M HA and 0.10 M NaA solution should be mixed to prepare the buffer?

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