Why does
water dissolve some substances and not others?
Purpose: To monitor different substances
solubility in water, and then investigate whether temperature and reactivity
(between substances) affect the overall solubility.
Investigate:
1) Oil
(hydrocarbon)
2) Ethanol
(Alcohol)
3) Salt
(Ionic & Polar)
General
Overview:
- Add each of these substances to
water to investigate their solubility. Use the same volume of water, and dye
the liquids so as to measure the amount of time to mix with the water. Monitor
the dissolution rate in increments of 5 seconds (some substances may take
longer). If the substance does not mix after one minute, observe where it goes.
Repeat these processes again, though stir the liquid instead of leaving it to
sit.
-
To measure the volume of the substance in the case that it is not soluble or
does not completely dissolve in one minute,
- For the
second stage of the experiment, investigate the solubility of the above liquids
in water after the liquid has been heated over a constant temperature of 50
degrees. Then in the repeat test heat water to the same temperature instead of
the liquid and compare the results.
- Then, for
the third stage of the experiment, mix:
1) Oil
(hydrocarbon) + Ethanol (Alcohol)
2) Ethanol
(Alcohol) + Salt (Ionic & Polar)
3) Salt
(Ionic & Polar) + Oil (hydrocarbon)
These are
mixed over a heat of 50 degrees before they are added to the water to
investigate the effect of temperature and mixing the substances together on the
water’s ability to mix with them.
How will I accurately measure the volume that doesn't dissolve?
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