. A student transferred a 10-mL aliquot of a stock sodium hypochlorite solution into a 50-mL volumetric flask using a volumetric pipet. The solution was then diluted to the mark with distilled water. Assuming that the concentration of a stock sodium hypochlorite is 6.25% (w/v), calculate the molarity of the diluted sodium hypochlorite solution. Molar mass of sodium hypochlorite

0.1679 M is the molarity of the diluted sodium hypochlorite solution.

Explanation:

Concentration of a stock sodium hypochlorite solution = 6.25%(w/v)

This means that 6.25 grams of sodium hypochlorite is present in 100 mL of solution.

Moles of sodium hypochlorite =

Volume of the solution = 100 mL = 0.100 L ( 1 mL=0.001 L)

Molarity of the solution =

Molarity of the of a stock sodium hypochlorite solution =

Volume of stock sodium hypochlorite solution taken for dilution =

Molarity of stock sodium hypochlorite solution after dilution =

Volume of stock sodium hypochlorite solution after dilution =

0.1679 M is the molarity of the diluted sodium hypochlorite solution.

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