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JEE Main & Advanced Chemistry Equilibrium / साम्यावस्था Question Bank Hydrogenion concentration pH scale and buffer solution

  • question_answer
    The \[pH\] of a \[{{10}^{-10}}\] molar \[HCl\] solution is approximately [NCERT 1977]

    A)                 10          

    B)                 7

    C)                 1             

    D)                 14

    Correct Answer: B

    Solution :

               \[{{10}^{-10}}M\,\,HCl={{10}^{-10}}\,M\,[{{H}^{+}}]\]. But pH\[\ne 10\] because solution is acidic. This is because \[{{H}^{+}}\]from \[{{H}_{2}}O({{10}^{-7}}M)\]cannot be neglected.                    Total \[[{{H}^{+}}]={{10}^{-7}}+{{10}^{-10}}\]                  \[={{10}^{-7}}+(1+{{10}^{-3}})={{10}^{-7}}(1.001)\]                                 That is why \[pH=7\](slightly less than 7)


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