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JEE Main & Advanced Chemistry Equilibrium / साम्यावस्था Question Bank Critical Thinking

  • question_answer
    pH of 0.1 M solution of a weak acid (HA) is 4.50. It is neutralised with \[NaOH\] solution to decrease the acid content to half pH of the resulting solution         [JIPMER 2002]

    A)                 4.50       

    B)                 8.00

    C)                 7.00       

    D)                 10.00

    Correct Answer: B

    Solution :

               \[pH=pKa+\log \frac{[Salt]}{[Acid]}\]                    \[pH=pKa\]                                 \[Ka=0.1\times {{({{10}^{-3.5}})}^{2}}=0.1\times {{10}^{-7}}={{10}^{-8}}\] Þ \[pH=8\]


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