Q4 / 200 · Manipal (MET) 2014 · Chemistry

An aqueous solution of phosphoric acid, $\mathrm{H}_3 \mathrm{PO}_4$ being titrated has molarity equal to 0.25 M . Which of the following could be normality of this solution?

  • A
    0.25 N
  • B
    0.50 N
  • C
    0.75 N
  • Correct answer
    D
    All of these

Solution

As phosphoric acid is a tribasic acid, its $n$-factor can be 1, 2 or 3 . Hence, its normality can be $M$, $2 M$ or $3 M$, Where, $M$ is molarity of solution. Therefore, $N=0.25,0.50$ or 0.75 .

Hence, the correct answer is option: 'D'.

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