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

  • question_answer
    The \[pH\] of the aqueous solution containing \[0.49\,\,gm\]of \[{{H}_{2}}S{{O}_{4}}\] in one litre is       [EAMCET 1997]

    A)                 2             

    B)                 1

    C)                 1.7         

    D)                 0.3

    Correct Answer: A

    Solution :

               Moles of \[{{H}_{2}}S{{O}_{4}}=\frac{0.49}{98}=5\times {{10}^{-3}}\] moles of \[{{H}_{2}}S{{O}_{4}}\]  present per litre of solution (molarity) \[=\frac{.005}{1}=.005\]M.                           \[{{H}_{2}}S{{O}_{4}}+2{{H}_{2}}O\]⇌\[2{{H}_{3}}{{O}^{+}}+SO_{4}^{-\,-}\]                    one mole of \[{{H}_{2}}S{{O}_{4}}\] give 2 moles of \[{{H}_{3}}{{O}^{+}}\]ions.                    \[{{H}_{3}}{{O}^{+}}=2\times ({{H}_{2}}S{{O}_{4}})\]\[=2\times 0.005=0.01\]M                                 \[[{{H}^{+}}]={{10}^{-2}}\]M ; \[pH=2\]


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