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One litre of buffer solution contains 0....

One litre of buffer solution contains 0.1 mole of acetic acid add 1 mole of sodium acetate. Find its pH if `pK_(a)` of `CH_(3)COOH` is 4.8.

Text Solution

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`pH= pK_a + log"" (["salt"])/(["acid"])`
[ Salt ] =[Acid] =1
`therefore pH = 4.8 = pK_a `
mole of NaOH added to the solution = 4/40 = 0.1

After adding 0.1 mole of caustic soda to the buffer solution
` pH = 4.8 + log ""(1.1)/( 0.9 ) = 4.8 + log 1.222 = 4.886`
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