Enoon wrote:...anyone any ideas?
(1) Find out what volume/weight/drops water you need to dissolve 1g of the (pure as possible) salt. Next time you can use this information to dissolve an amount of the salt in as little water as possible. So your solution will always be close to saturated. Use hot (tap)water and give the salt some time when you can see it starts to dissolve.
(2) Find out the weight/volume of your drops of water. Weigh 100 drops and repeat a couple of times to get a nice average that you can use to calculate how much volume/weight is 1 or 5 of
your drops of water.
(3) Now take 1L of acetone. Make sure it is a big volume (like 1L) and make sure you know the volume. Perhaps weigh a known volume of
your acetone to be sure of the density of your acetone. If you compare this with the density of pure acetone (see wiki or so) you should be able to calculate how much water is in your acetone. You need very pure acetone, about 99%. If you know the density of your acetone you can weigh a volume. Dunno if that is practical but still..
(Z) Dropwise add your fairly saturated salt solution to the known volume (1L) of acetone. At start the concentration of acetone will be near 99%, so the salt will probably crash out immediately. But as you add more drops you will add more water. At some point the drops wont give rise to precipitates anymore. This is the point where there is too much water in the acetone. The salt remains dissolved.
Now you have all the information you need to figure out roughly at what % of your acetone your pap salt precipitates, or stays in solution.
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