What is the pH of a buffer prepared by adding 6.0 mol of acetic acid and...

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What is the pH of a buffer prepared by adding 6.0 mol of acetic acid and...

What is the pH of a buffer prepared by adding 6.0 mol of acetic acid and 1 mol of NaOH to water to make a 1.0-L solution? K_a for acetic acid is 1.75*10^-5 and its pK_a is 4.76.

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Answer 1

Answer #1

pH= pka + log [acetate ]/[acetic acid]

acetic acid moles = 6

NaOOH moles added = 1

acetic acid reacts with NaOH to form sodium acetate

henceacetic acid after reaction = 6-1 = 5 ,

acetate moles = NaoH moels reacted = 1

Now [acetic acdi] = moles/vol = 5/1 = 5 , [acetate] = 1/1 = 1 ,

now pH = 4.76 + log ( 1/5)

= 4.06

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Answer 2

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