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CMC Medical CMC-Medical Ludhiana Solved Paper-2008

  • question_answer
    At \[90{}^\circ C,\]pure water has\[{{H}_{3}}{{O}^{+}}\]ion concentration of \[{{10}^{-6}}mol\text{/}L.\] The\[{{K}_{w}}\]at\[90{}^\circ C\] is

    A)  \[{{10}^{-6}}\]                                 

    B)  \[{{10}^{-14}}\]

    C)  \[{{10}^{-12}}\]                               

    D)  \[{{10}^{-8}}\]

    Correct Answer: C

    Solution :

                    \[{{K}_{w}}=[{{H}^{+}}]\,[O{{H}^{-}}]\] \[=({{10}^{-6}})\times ({{10}^{-6}})\]      \[(\because [{{H}^{+}}]=[O{{H}^{-}}])\] \[={{10}^{-12}}\]


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