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Haryana PMT Haryana PMT Solved Paper-2010

  • question_answer
    The concentration of hydronium ions in a cup of black coffee is \[1.3\times {{10}^{-5}}M\]. What will be the pH of the coffee?

    A)  \[4.89\]          

    B)  \[3.89\]

    C)  \[2.20\]

    D)  None of these

    Correct Answer: A

    Solution :

                    Given, \[[{{H}_{3}}{{O}^{+}}]=1.3\times {{10}^{-5}}\]                 \[\because \]     \[pH=-\log [{{H}_{3}}{{O}^{+}}]\]                                 \[=-\log (1.3\times {{10}^{-5}})\]                                 \[=-(\log 1.3+\log {{10}^{-5}})\]                                 \[=-0.1139+5\]                 \[\therefore \]  \[pH=4.886\approx 4.89\]


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