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?
In a stoichiometry lab problem, it's important to know the density of the bleach solution because it helps us determine the concentration of the active ingredient, usually sodium hypochlorite (NaClO), in the bleach. The concentration of the active ingredient is a crucial factor in stoichiometric calculations.
By knowing the density of the bleach solution, we can calculate the mass of bleach solution used, and from there, calculate the moles of NaClO present. This information is then used to determine the stoichiometric ratios and perform calculations related to the reaction.
On the other hand, the density of the H2O2 (hydrogen peroxide) solution may not be necessary for this specific stoichiometry lab problem. It depends on the specific reaction being studied and the information needed for the calculations. If the specific lab problem involves only the bleach solution, then measuring the density of the H2O2 solution may not be relevant.
It's important to always carefully read and understand the lab instructions or problem statement to determine which information is necessary for the calculations and measurements.