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  3. WB JEE Medical

WB JEE Medical WB JEE Medical Solved Paper-2007

  • question_answer
    In the titration of \[N{{a}_{2}}C{{O}_{3}}\]and \[HCl,\]the indicator used is

    A)  methyl orange

    B)  methylene blue

    C)  phenolphthalein

    D)  litmus

    Correct Answer: A

    Solution :

                     pH of the solution at the equivalence point is on the acidic side due to dissolution of \[\text{C}{{\text{O}}_{\text{2}}}\]formed. A slight excess of strong acid lowers the pH to 3.5 when methyl orange produces red colour.


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