posted by HELP PLEASE .
Why did you need to know the density of the bleach solution? Why didn't you measure the density of h2o2 solution as well?
Stoichiometry lab problem
You don't provide enough information for me to know what you did. Did you titrated with H2O2? If so you knew the molarity and that's all you needed. Were you titrating bleach? You wanted to know % w/w and for that you had to know the mass of the bleach solution?