Enter your answer in the provided box. The pH of a sodium acetate-acetic acid buffer is...

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Question

Enter your answer in the provided box. The pH of a sodium acetate-acetic acid buffer is 4.80. Calculate the ratio [CH3COO−] / [CH3COOH].

Answer 1

Answer #1

Given, pH = 4.80

Now we know from the ka value tables the ka value for acetic acid = 1.8×10^-5

So pK_a = -log k_a

pKa = -log (1.8×10^-5)

=4.74

Now using handerson-hasselbalch equation,

pH= pK_a+ log

pH - pK_a = log

Putting values we get,

4.80 - 4.74 = log

0.06 =log

Or taking antilog , we get

= 10^0.06= 1.14

So the ratio is,

= 1.14

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Answer 2

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