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Manipal Engineering Manipal Engineering Solved Paper-2013

  • question_answer
    Determine the\[pH\]of\[0.024\,\,M\]hydroxylamine hydrochloride solution. (\[{{k}_{b}}\]of hydroxyl amine is\[{{10}^{-8}}\]).

    A) 8.4                      

    B)        6.2

    C) 3.8                     

    D)        5.6

    Correct Answer: C

    Solution :

    \[HO{{\overset{+}{\mathop{NH}}\,}_{3}}+{{H}_{2}}OHON{{H}_{3}}OH+{{H}^{+}}\] \[{{K}_{h}}=\frac{{{K}_{w}}}{{{k}_{b}}}=\frac{{{10}^{-14}}}{{{10}^{-8}}}={{10}^{-6}}\] \[[{{H}^{+}}]=\sqrt{{{K}_{h}}C}\]                 \[=\sqrt{{{10}^{-6}}\times 0.024}\]                 \[=1.5\times {{10}^{-4}}\] and        \[pH=3.8\]


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