Question

sodium hydroxide is extremely soluble in water. At a certain temperature, a saturated solution contains 551g of NaOH (s) per liter of solution.Calculate the molarity of this saturated NaOH (aq) solution.

Answer 1

Answer: 13.776 M

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per Liter of the solution.

$Molarity=\frac{n}{V_s}$

where,

n= moles of solute  

$V_s$ = volume of solution in L = 1 L

moles of solute = $\frac{\text {given mass}}{\text {molar mass}}=\frac{551g}{39.997g/mol}=13.776moles$

Now put all the given values in the formula of molarity, we get

$Molarity=\frac{13.776moles}{1L}=13.776mole/L$

Thus molarity of this saturated NaOH (aq) solution is 13.776 M