Molarity of a given orthophosphoric acid solution is $3 M$ . Its normality is:

9 N

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0.3 N

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3 N

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1 N

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Solution

The correct option is A $9 N$

Phosphoric acid also known as orthophosphoric acid or phosphoric(V) acid is a mineral (inorganic) acid having the chemical formula $H_{3} P O_{4}$ .

Phosphoric acid $(H_{3} P O_{4})$ no. of $H^{+}$ ions it produces on dissociation per molecule of acid is $3$ . Hence the n-factor for phosphoric acid $H_{3} P O_{4}$ is $3$ .

$N o r m a l i t y = M o l a r i t y \times n - f a c t o r$
So, Normality of $H_{3} P O_{4} = 3 \times 3 = 9$

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