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preparing a buffer

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myelver10:
how would u  pick a suitable acid/base pair  to prepare a buffer with a pH of 3.5    

In this case the pKa is 3.5  right   ??

AWK:
For weak acid with pKa = 3.5 your buffer solution should contain salt and weak acid with molar ratio 1:1. Of course you can use other acids, but with pKa within +-1 around pH of solution.
Formic acid with pKa 3.7 is probably the best choose.

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