The average concentration of $N a^{+}$ ion in human body is $3$ to $4$ g per litre. The approximate molarity of $N a^{+}$ ion in the body is :

0.15

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0.2

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0.25

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0.3

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Solution

The correct option is D $0.15$ M
The average concentration of $N a^{+}$ ion in human body is $3$ to $4$ g per litre. Let us say, it is $3.5$ g per litre.
The molar mass of sodium is $23$ g/mol.
The approximate molarity of $N a^{+}$ ion in body is given by, $\frac{N u m b e r o f m o l e s o f N a^{+} i o n}{V o l u m e o f s o l u t i o n} = \frac{M a s s o f N a^{+} i o n}{M o l a r m a s s o f N a^{+} i o n \times V o l u m e o f s o l u t i o n} = \frac{3.5}{23 \times 1} = 0.15$ M.

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