RAJASTHAN PMT Rajasthan - PMT Solved Paper-2009

  • question_answer
    Which one of the following is conjugate acid of water in the reaction?                 \[{{H}_{2}}S{{O}_{4}}+{{H}_{2}}O{{H}_{3}}{{O}^{+}}+HSO_{4}^{-}\]

    A) \[{{H}_{2}}O\]                  

    B) \[{{H}_{3}}{{O}^{+}}\]   

    C)        \[SO_{4}^{2-}\]

    D)        \[HSO_{4}^{-}\]

    Correct Answer: B

    Solution :

    \[\underset{aci{{d}_{1}}}{\mathop{{{H}_{2}}S{{O}_{4}}}}\,+\underset{bas{{e}_{2}}}{\mathop{{{H}_{2}}O}}\,\underset{aci{{d}_{2}}}{\mathop{{{H}_{3}}{{O}^{+}}}}\,+\underset{bas{{e}_{1}}}{\mathop{HSO_{4}^{-}}}\,\] In the above reaction, \[{{H}_{2}}S{{O}_{4}}\] lose a proton \[({{H}^{+}})\] which is gain by\[{{H}_{2}}O\], hence \[{{H}_{2}}S{{O}_{4}}\] is an acid and \[{{H}_{2}}O\] is base. If this reaction is reversible \[{{H}_{3}}{{O}^{+}}\] losses a proton which is accepted by\[HSO_{4}^{-}\], so \[{{H}_{3}}{{O}^{+}}\]is an acid and \[HSO_{4}^{-}\] is base. So, conjugate base of \[{{H}_{2}}S{{O}_{4}}\] is \[HSO_{4}^{-}\] and conjugate acid of \[{{H}_{2}}O\] is\[{{H}_{3}}{{O}^{+}}\].


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