RAJASTHAN PMT Rajasthan - PMT Solved Paper-2009

  • question_answer
    If \[{{H}^{+}}\] concentration of fruit juice is\[3.3\times {{10}^{-2}}\], then its \[pH\] will be

    A) \[4.8\,\,basic\]                 

    B)        \[4.8\,\,neutral\]                            

    C)        \[4.8\,\,acidic\]                

    D)        \[1.6\,\,acidic\]

    Correct Answer: D

    Solution :

    \[[{{H}^{+}}]=3.3\times {{10}^{-2}}\]   \[pH=-\log [{{H}^{+}}]\]          \[=-\log [3.3\times {{10}^{-2}}]\]          \[=-\{\log 3.3+(-2\log 10)\}\]          \[=-\{0.5185-2\}\] \[\therefore \]  \[pH=1.4815\,\,acidic\] \[\therefore \]  \[pH\approx 1.6\,\,acidic\](approximately)


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