When a 50 mL test tube of water is poured into 50 mL alchohol, what happens to the missing mL?
Answer:
Pure alcohol will actually dissolve in water, and water will actually dissolve in pure alcohol. The upshot is that when mixed, their molecules will actually partly fill up the space between the other molecules, and they will take up less space than the original fluids did.
In fact, it is normal for alcohol to dissolve enough water to form a concentration of 95% by weight. This property of alcohol and water is called azeotropism--a solution of 95% alcohol is called an azeotrope, because you can't distill alcohol to be any more pure than 95%. To get pure alcohol, you actually have to pass it through a drying agent.
The alcohol molecules are quite a bit bigger that the water molecules and don't fit together very well. This leaves a little bit of room between them to let the water molecules slip between and fill the spaces.
I think...
It is stuck to the sides of the test tube the water started out in. The water forms a very thin film on the test tube it was in. you can see this by touching the insides of the tube with a paper towel or colored sheet if you have one around
Density of water is approximately 1.00 and Density of Ethyl alcohol is 0.789. When you measure both for 50 ml and mix both, average density will be less than water and more than ethyl alcohol, here is the missing ml.
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