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  • The of dimethylamine and of acetic acid are <img alt="3.27" src="https://entrancecorner.oncod

The pK_{b} of dimethylamine and pK_{a} of acetic acid are 3.27and 4.77 respectively at T(K). The correct option for the pH of dimethylammonium acetate solution is :
 

Option: 1

8.50


Option: 2

5.50


Option: 3

7.75

 


Option: 4

6.25


Answers (1)

best_answer

We know the formula for pH of salt of the weak acid and weak base -

\mathrm{pH}=7+\frac{1}{2}\left(\mathrm{pK}_{\mathrm{a}}-\mathrm{pK}_{\mathrm{b}}\right)

Given, 

\mathrm{pK_a}= 3.27\textup{ and }\mathrm{pK_b}= 4.77

So, 

\mathrm{pH}=7+\frac{1}{2}(4.77-3.27)

\mathrm{pH}=7.75

Therefore, the correct option is (3).

Posted by

vinayak

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