Citric acid (192.13 g/mol) is a triprotic acid with the following chemical formula: H3C6O7H5. The acid dissociation...

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Chemistry

Citric acid (192.13 g/mol) is a triprotic acid with thefollowing chemical formula: H3C6O7H5.
The acid dissociation constants for citric acid are:
Ka1 = 7.1 x 10^-4 M; Ka2 = 1.7 x 10^-5 M; Ka3 = 6.4 x 10^-6M
Describe how you would prepare at least 100.00 mL (you may makemore) of a citrate buffer with a pH of about 4.40. You haveavailable distilled water, volumetric flasks and any sodium saltsyou desire. You must indicate the amount in grams of materialneeded (except for water, you may use volume). Your designed buffermust have a reasonable buffer capacity and no solution you make canhave a concentration greater than 0.500 M.

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4.2 Ratings (797 Votes)

Ka1 71 x 104 we know that pKa logKa so pKa1 log 71 x 104 31487 pKa2 log 17 x 105 476955 pKa3 log 64 x 106 51938 given pH of buffer 44 when choosing a buffer its pKa should close to the pH from the above we get pKa2 is close to pH so the required See Answer

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