Q3.108P - Chemistry: Molecular Nature Of Matter And Change

Question

Ordinary household bleach is an aqueous solution of sodium hypochlorite. What is the molarity of a bleach solution that contains 20.5 g of sodium hypochlorite in a total volume of 375 mL?

Step-by-Step Solution

Answer

The molarity of the bleach solution is 0.733 M NaClO solution.

Step 1: Calculating the moles of NaClO

Convert the mass of sodium hypochlorite into moles:

$\begin{array}{rcl}Moles of NaClO& =& 20.5 g NaClO\times \frac{1 mol NaClO}{74.44 g NaClO}\\ & =& 0.275 mol NaClO.\end{array}$

Step 2: Calculating the molarity

Now, divide the mole number to find the molarity:

$\begin{array}{rcl}Molarity& =& \frac{0.275 mol NaClO}{375\times {10}^{-3}L so\ln }\\ & =& 0.733 Mol.\end{array}$