Answer to Question #27791 in Inorganic Chemistry for cameo11

Question

There is a most annoying issue, about how to make sodium hypochlorite solution, from home bleaches that show different ways of strength.

Exactly, I have a bleach that literally says that "it contains cca 40 g/l of active chlorine in the moment of filling".

What is the explanation and calculation way, to make 5% NaOCl solution from it?

Strengths of bleaches are expressed in so many ways (%,vol%,grades of chlorine...) that it makes it very difficult to calculate amounts of bleach and solvent, to make a specific concentration.

What is the bleach strength determined by Cl- ion,ClO- ione amount of NaOCl(?) solved or something else?

Is there any source of comparative values so that this confusion be cleared up?

Looking forward to your response.

Thank you.