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NEET NEET SOLVED PAPER 2015 (Re)

  • question_answer
    What is the pH of the resulting solution when equal volumes of 0.1 M \[NaOH\]and \[M\,HCl\] are mixed?         

    A)                          12.65            

    B)  2.0                        

    C)  7.0                        

    D)  1.04

    Correct Answer: A

    Solution :

    Key concept When equal volumes of acid and base are mixed, then resulting solution become alkaline if concentration of base is taken high. Let normality of the solution after mixing 0.1 M \[NaOH\,\text{and}\,\text{0}\text{.01M}\,\text{HCl}\]is N. \[\therefore \]        \[{{N}_{1}}{{V}_{1}}-{{N}_{2}}{{V}_{2}}=NV\] or        \[0.1\times 1-0.01\times 1=N\times 2\] Since, normality of \[NaOH\] is more than that of \[HCl\]. Hence, the resulting solution is alkaline. or           \[[\overset{\_}{\mathop{O}}\,H]=N=\frac{0.09}{2}=0.045N\] or            \[pOH=-\log (0.045)=1.35\] \[\therefore \]  \[pH=14-pOH\]                 \[=14-1.35=12.65\]


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