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Can you help me out here pls? I don't know how to work it out?

What mass of sodium methaneoate should be dissolved in 250cm3 of 0.100mol Dm-3 methanoic acid to form a buffer solution with pH of 5.20 (Ka for methanoic acid = 1.78x10-5)
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Original post by jaims_121
What mass of sodium methaneoate should be dissolved in 250cm3 of 0.100mol Dm-3 methanoic acid to form a buffer solution with pH of 5.20 (Ka for methanoic acid = 1.78x10-5)


Made a mistake its (Ka for methanoic acid = 1.78x10-4)

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