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A buffer solution is prepared by mixing...

A buffer solution is prepared by mixing 50 mL of 0.2 M of acetic acid with .x. mL of 0.2 M of NaOH solutions. If pH of the resulting buffer solutions is 4. 7 then value of .x. is (Ka= `2xx10 ^(-5))`

A

28 mL

B

22 m L

C

24 mL

D

25 mL

Text Solution

Verified by Experts

The correct Answer is:
D
` pH =pKa +log "" ([S])/([A]) , 4.7 =4.7 +log "" ([S])/([A]) `
`rArr [S]=[A]`
` x xx 0.2 = 50 xx 0.2 - x xx 0.2 `
`rArr x = ( 50 xx 0.2)/(2 xx 0.2 ) = 25 mL `
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