# Peroxide

How much distilled water (in liters) must pharmacists pour into 300 ml of 23.6% solution of hydrogen peroxide to get 2.7% solution to gargle?

Correct result:

V =  2.4 l

#### Solution:

$V= \dfrac{ 300}{1000} \cdot ( \dfrac{ 23.6}{ 2.7} -1 + \dfrac{ 23.6}{ 100} ) = 2.4 \ \text{l}$

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