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Mole Concept

Calculate the...

Question

Calculate the mass of $N a_{2} C O_{3}$ required to prepare $250 m l$ of $0.5 N$ solution.

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Solution

$M o l a r i t y = \frac{no. of moles of solute}{volume of solution in L}$
$0.5 = \frac{\frac{106}{x}}{250} x = \frac{106}{125} x = 0.848 g$ Molar mass of $N a_{2} C O_{3} = 106 g$

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