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Standard X

Chemistry

Physical Properties

If the densit...

Question

If the density of Lake water is 1.25g/ml and contains 92 g of sodium ions per kg of water, calculate molarity in the Lake.

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Solution

Number of moles of
${N a}^{+}$
=
$\frac{M a s s}{M o l a r m a s s} = \frac{92}{23}$

$D e n s i t y = \frac{M a s s}{V o l u m e}$
$V = \frac{M a s s}{d e n s i t y} = \frac{1000}{1.25} (g)$
$V = 800 m l$
$M o l a r i t y = \frac{N u m b e r o f m o l e s}{V o l u m e (m l)} \times 1000$
$M o l a r i t y = \frac{4 \times 1000}{800} = 5 m o l e s$

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If the density of Lake water is 1.25g/ml and contains 92 g of sodium ions per kg of water, calculate molarity in the Lake.

Number of moles of Na+ = MassMolarmass=9223 Density=MassVolumeV=Massdensity=10001.25(g)V=800mlMolarity=NumberofmolesVolume(ml)×1000Molarity=4×1000800=5moles