Question

5mg NaCl per litre is ka answer

Answer 1

Answer : 5 mg NaCl per liter is, $8.54\times 10^{-5}mole/L$

Solution : Given,

Mass of NaCl = 5 mg = $5\times 10^{-3}g$      $(1mg=10^{-3}g)$

Volume of solution = 1 L

Molar mass of NaCl = 58.5 g/mole

Molarity : It is defined as the number of moles of solute present in one liter of solution.

Formula used :

$Molarity=\frac{\text{Moles of solute}}{\text{Molar mass of solute}\times \text{volume of solution in liter}}=\frac{5\times 10^{-3}g}{58.5g/mole\times 1L}=8.54\times 10^{-5}mole/L$

Therefore, 5 mg NaCl per liter is, $8.54\times 10^{-5}mole/L$