Disinfecting solution

How much distilled water is necessary to pour into 500 ml of 33% hydrogen peroxide to obtain a 3% disinfecting solution?

Correct answer:

x =  5000 ml

Step-by-step explanation:

V=500 ml r=33%=10033​=0.33 k=3%=1003​=0.03  r⋅ V=k⋅ (x+V) 0.33⋅ 500=0.03⋅ (x+500)  0.03x=150  x=0.03150​=5000  x=5000=5000 ml

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