perplexus.info :: Science : Mixture Mix Muse

Mixture Mix Muse (Posted on 2022-04-16)

In a high school science class, Riley was given 50 milliliters of water and 50 milliliters of ethanol. His task was to mix them together and then run an experiment on the mixture.

When the teacher came to check on him, however, Riley's mixture only contained 94 milliliters. The teacher accused him of drinking some of the mixture in an attempt to get intoxicated and immediately sent him to the principal. Riley swore that he did NOT drink the mixture and he didn't lose any of the liquids by any means.

What happened to the other 6 milliliters and how could Riley prove his innocence?

See The Solution Submitted by K Sengupta

Rating: 5.0000 (1 votes)

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| Comment 4 of 8 |

First, yes - the miscibility (dissolving) of ethanol in H20 was the answer sought, not my evaporation explanation.

However, I do think I had the evaporation of pure ethanol correct as well. This second effect will continue to drop the ethanol level, in 20 min about 5 more mL.

What I am not completely sure of is if the ethanol in mixture will evaporate at the same rate as pure ethanol. I am pretty sure (from recalling partial pressures) that it will.

Edited on April 17, 2022, 4:53 pm

Posted by Steven Lord on 2022-04-17 12:19:00

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