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20 mL of a '20 volume' H2O2 solution is diluted to a total volume of 80 mL. The volume strength of the resulting solution is:

1. '80 vol'
2. '25 vol'
3. '5 vol'
4. '8 vol'

Correct answer: '5 vol'

Solution

Diluting from 20 mL to 80 mL is a 4-fold dilution, so 20 vol becomes 20/4 = 5 vol.

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