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Calculate the pH of a buffer solution that contains .820 grams of sodim acetate and .010...

Calculate the pH of a buffer solution that contains .820 grams of sodim acetate and .010 moles of acetic acid in 100 mL of water. The Ka of acetic acid is 1.77 x 10^-5.

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Answer #1

The pH of a buffer is given by Hendersen equation as

                pH = pKa +log [conjugate base]/[acid]

The concentrations are [sodium acetate] = 0.82g/82gmol-1 in 100mL = 0.1 mol in 100 mL

                                                [acid ] = o.1 mol in 100 mL

pKa of acid = -log[1.77x 10-5] = 4.75

substituting the values pH = 4.75 + log (0.1)/(0.1) = 4.75               

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