Peroxide

How many litres of distilled water must a pharmacist add to 300 ml of 32.7% hydrogen peroxide solution to obtain a 2.8% gargling solution?

Final Answer:

V =  3.2 l

Step-by-step explanation:

V1​=300 ml→ l=300:1000  l=0.3 l r1​=32.7%=10032.7​=0.327 r2​=2.8%=1002.8​=0.028  V1​⋅ r1​=(V+V1​)⋅ r2​ 0.3⋅ 0.327=(V+0.3)⋅ 0.028  0.028V=0.0897  V=0.0280.0897​=3.20357143  V=280897​≐3.203571=3.2 l

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