Question

Match the solutions given in list I with concentrations in list II.

Answer 1

Molar concentration, also called molarity, amount concentration or substance concentration is a measure of the concentration of a solute in a solution or of any chemical species in terms of amount of substance in a given volume. It can be calculated as follows:

Molarity $=\frac{\text{mass}}{M}\times \frac{1000}{V}$

$\left(A\right)$ Caustic\quad soda $=NaOH$

Molecular weight of $NaOH$ $=40$ g/mol

Molarity $=\frac{\text{mass}}{M}\times \frac{1000}{V}$ $⟹\frac{4}{40}\times \frac{1000}{200}=0.5M$

$\left(B\right)$ Sodium carbonate $={Na}_{2}C{O}_3$

Molecular weight $=106$ g/mol

Molarity $=\frac{\text{mass}}{M}\times \frac{1000}{V}$ $⟹\frac{5.3}{106}\times \frac{1000}{100}=0.5M$

$\left(C\right)$ Molecular weight of $HCl=36.5$ g/mol

Molarity $=\frac{\text{mass}}{M}\times \frac{1000}{V}$ $⟹\frac{0.365}{36.5}\times \frac{1000}{50}=0.2M$