Question

What is the WATER concentration in 1 liter of a solution that contains 2 moles of ions? (NOT the ion concentration)

Answer 1

Answer: The concentration of water is 1 M

Explanation:

We are given:

Moles of ions a solution contains = 2 moles

The chemical equation for the ionization of water follows:

$H_2O\rightarrow H^++OH^-$

From the above equation:

2 moles of total ions are produced by 1 mole of water

To calculate the molarity of solution, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Moles of solute}}{\text{Volume of solution (in L)}}$

Moles of water = 1 mol

Volume of solution = 1 L

Putting values in above equation, we get:

$\text{Molarity of }H_2O=\frac{1mol}{1L}\\\\\text{Molarity of }H_2O=1M$

Hence, the concentration of water is 1 M