2. Sample Papers
  3. NEET

NEET Sample Paper NEET Sample Test Paper-91

  • question_answer
    For preparing a buffer solution of pH 6 by mixing sodium acetate and acetic acid, the ratio of the concentration of salt and acid should be \[({{K}_{a}}={{10}^{-5}})\]

    A) 1 : 10   

    B)        10 : 1

    C) 100 : 1 

    D)        1 : 100

    Correct Answer: B

    Solution :

    [b] \[pH=p{{K}_{a}}+\log \frac{\text{Salt}}{\text{Acid}}\] \[6=-\log {{10}^{-5}}+\log \frac{\text{Salt}}{\text{Acid}}=5+\log \frac{\text{Salt}}{\text{Acid}}\] \[\log \frac{\text{Salt}}{\text{Acid}}\] must be 1. \[\therefore \]\[\frac{\text{Salt}}{\text{Acid}}\text{=}\frac{10}{1}\] or \[10:1.\]


You need to login to perform this action.
You will be redirected in 3 sec spinner