SOLUTION: I'm using a solution of 40% Hydrogen peroxide and 60% water. I want to dilute it to 3% Hydrogen peroxide and 97% water. In the recesses of my brain I remember a formula for thi

Question 172991: I'm using a solution of 40% Hydrogen peroxide and 60% water. I want to dilute it to 3% Hydrogen peroxide and 97% water.
In the recesses of my brain I remember a formula for this but I can't seem to dig it out.
Any help?
Thanks,
Pete Ouellette
Lab Manager
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
I'm using a solution of 40% Hydrogen peroxide and 60% water. I want to dilute it to 3% Hydrogen peroxide and 97% water.
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You have to state a volume. If you start with 1 liter of 40%, eg, then that's 400 cc of HP. To make that 400 cc 3%, water has to be 97%.
So you add 400*(97/3) cc of water.
=~12.933 liters
That might be a lot, but it's scaleable, and you see how it's done.
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As an equation,
Volume of 40% *(40/3) = the total volume of 3%

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