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Buffer solutions HELP

Buffer solutions HELP

Troubles24

What mass of sodium methanoate should be dissolved in 250 cm3 of 0.100 mol dm-3 methanoic acid to form a buffer solution with a pH of 5.20 (Ka for methanoic acid = 1.78 x 10-4 mol dm-3)???

How would you work it out? Pls can someone help :frown:

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