Solutions — Chemistry STD 12 Science — Question

1. solution:

The solution which obey Roult's law over entire range of concentration are known as ideal solution.

For ideal solution: Enthalpy of mixing of the pure components to form the solution, Δ_mix H = 0 and volume of mixing, Δ_mix V = 0

2. Molarity: 

It is defined as the number of moles of solute present in 1000 mL of the solution. Molarity is represented by M.

$\text{Molarity (M)}=\frac{\text{Number of moles of solute}}{\text{ volume of solution in mL}}\times1000$

or

$\text{M} = \frac{\text{Weight of solute}}{\text{molar mass of solute}\times \text{Volume of solution in mL}}\times1000$