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  • Need explanation for: pKa of a weak acid (HA) and pKb of a weak base (BOH) are 3.2 and 3.4, respectively. The pH of their salt (AB) solution is :

 pKa of a weak acid (HA) and pKb of a weak base (BOH) are 3.2 and 3.4, respectively. The pH of their salt (AB) solution is :

 

  • Option 1)

    7.0

  • Option 2)

     1.0

     

  • Option 3)

    7.2

     

  • Option 4)

     6.9

     

 

Answers (1)

best_answer

As we learned in

We know that

pH\:=\:7+\frac{1}{2}pKa-\frac{1}{2}pKb

=> pH\:=\:7+\frac{1}{2}\times3.2-\frac{1}{2}\times3.4

               = 6.9


Option 1)

7.0

This option is incorrect.

Option 2)

 1.0

 

This option is incorrect.

Option 3)

7.2

 

This option is incorrect.

Option 4)

 6.9

 

This option is correct.

Posted by

Aadil

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