Problem: A solution of household bleach contains 5.25% sodium hypochlorite, NaOCl, by mass. Assuming that the density of bleach is the same as water, calculate the volume (in mL) of household bleach that should be diluted with water to make 500.0 mL of a pH = 10.26 solution.

FREE Expert Solution

Assume 100 g of bleach solution:

mass NaOCl = 5.25 g
molar mass NaOCl = 74.44 g/mol
density = 1 g/mL

moles NaOCl=5.25 g×1 mol74.44 g

moles NaOCl = 0.07052 mol

volume=100 g×1 mL1 g×10-3 L1 mL

Calculate the molarity of the bleach solution:

molarity=0.07052 mol0.100 Lmolarity=0.7052 molL

molarity = 0.7052 M


500.0 mL of a pH = 10.26 solution solution:

Calculate the concentration of NaOCl:

NaOCl → Na+ + OCl-

OCl- + H2O → HOCl + OH-

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Problem Details

A solution of household bleach contains 5.25% sodium hypochlorite, NaOCl, by mass. Assuming that the density of bleach is the same as water, calculate the volume (in mL) of household bleach that should be diluted with water to make 500.0 mL of a pH = 10.26 solution.

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