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JIPMER Jipmer Medical Solved Paper-2013

  • question_answer
    \[p{{K}_{a}}\] of acetic acid and \[p{{K}_{b}}\] of ammonium hydroxide are 4.76 and 4.75 respectively. Calculate the pH of ammonium acetate solution.

    A)  6.02                      

    B)         7.005

    C)  8                            

    D)         5.602

    Correct Answer: B

    Solution :

                    \[pH=7+\frac{1}{2}[{{p}^{{{k}_{a}}}}-{{p}^{{{k}_{b}}}}]\] \[=7+\frac{1}{2}[4.76-4.75]=7+\frac{1}{2}\times 0.01\] \[=7+0.005=7.005\]        


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