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100 ml solution having 0.2 M HA (weak ac...

100 ml solution having 0.2 M HA (weak acid, `K_(a), = 1.0x10^(-5) )` and 0.2 N NaA, 200 ml of 0.1 M NaOH has been added. Furthermore, diluted to IL. Which of the following statement is correct?

A

Initially , the solution has pH equal to 5, that is before additions of NaOH

B

In the final solution , the concentration of `[OH^(-) ] is 10^(-9) ` M.

C

After the addition of NaOH , the pH of solution increase by four units.

D

After the addition of base, the solution losses buffering action and can be restored after the addition of acid.

Text Solution

Verified by Experts

The correct Answer is:
A, D
Initially acid buffer is present

` pH =5 + log ""(0.2)/( 0.2) = 5`
(b) after dilution to 1 lt,
` [HA] =0.02 N, [NaA ]= 0.02 N`
` [NaOH ]=0.02 N`
` {:( NaOH +, HA to , NaA + H_2O) , ( 0.02 N , 0.02N , -),( -,-,0.02N):}`
` therefore ` Due to addition of NaOH , buffer disappeared & salt is formed
` pH =7+ ( 5)/(2) +(1)/(2) log (4 xx 10 ^(-2) ) = 8.8 `
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Knowledge Check

  • P^(H) of a weak acid in 0.1 M solution is 4.3 Which statement are correct?

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    B
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    C
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    D
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    B
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