Hydrogen peroxide dilution

We need a 4% solution of H2O2 (hydrogen peroxide) for the disinfection solution. We only have a 40% solution available. How much water must we add to 100 ml of the original solution to obtain the desired concentration?

Final Answer:

x =  900 ml

Step-by-step explanation:


0.40 · 100 = 0.04(x+100)

0.40 · 100 = 0.04·(x+100)

0.04x = 36


x = 36/0.04 = 900

x = 900

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You need to know the following knowledge to solve this word math problem:

algebrabasic operations and conceptsUnits of physical quantitiesthemes, topicsGrade of the word problem

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