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  4. What is the molarity of 0.2 N Na 2 CO 3 solution?

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Q. What is the molarity of $0.2 \,N \,Na _{2} CO _{3}$ solution?

Solutions

Solution:

Molarity $=$ Normality $\times n_{f}$

$\Rightarrow $ Molarity $=\frac{\text { Normality }}{n_{f}}$

$\because n_{f}=2$ for $Na _{2} CO _{3}$)

$\therefore $ Molarity $=0.2 \times \frac{ M }{2 M }=0.1 M$