Flask containers
Chemistry
Level
2
A flask contains 500 ml of an 80% alcohol solution in water. How much of this solution must be drawn off and replaced by water to obtain a solution of 25% alcohol?\
None of the above
1000 ml
800 ml
900 ml
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I think the answer should be 343.75 ml (275/0.8) as removing this much solution and adding pure water would remove 275ml of alcohol leaving 125ml in 500ml which is 25%. Of the 343.75ml removed 275ml would be alcohol, as it’s concentration is 80%