Question

how can you get crystal of sugar from its solution ?

Answer 1

by the process of evaporation........

Answer 2

Answer

I can't give you a firm answer, but do have a few suggestions that might be helpful.

The substance you're seeing probably isn't the beginning of crystals. Once they've begun to develop, they're usually pretty clear crystals.

The smell and slim could be something else in the water or sugar. When doing the experiment be sure to use distilled relatively pure water and pure sugar without any additives or other substances mixed in. Also, be sure to cover the mixture after it's prepared to keep outside things from getting into the mixture. Lastly, it's probably best to clean the glassware (acetone then alcohol then water) and to store the mixture in a place that doesn't receive direct sunlight to prevent things other things from "growing" along with your crystals.

One question, are you heating the water sufficiently before adding the sugar? The point at which water becomes saturated with sugar (unable to dissolve anymore) varies with temperature. The idea is to heat the water so it can have a higher concentration of sugar than it would at room temperature. Then as the water cools the solution becomes "super-saturated" making it much easier (and more quickly) for the crystals to grow as the sugar needs to come out of solution. Evaporation can also be used to achieve a super-saturated solution, but that takes a bit longer.

Lastly I'll offer a suggestion based on personal experience. I've often had better luck growing Alum crystals (a kind of salt) than I have with growing sugar crystals. It's true you can't eat them in the end, but the crystals often turn out a bit better in my opinion. Alum is found in grocery stores and is the salt used to pickle things. While you don't want the kids to eat it (any more than you'd want them to eat table salt), I don't think it a dangerous substance and can be handled well with supervision. The procedure is the same; take a clean pot, get the water hot (even boiling), reduce the heat, stir in the Alum until no more is capable of being dissolved, then wait. Within a few hours you'll begin getting little crystalites. By the next day you'll have significantly large crystals. To grow bigger ones, take the best specimens from one batch and use them as starters for the subsequent batches(and tie a piece of string around the crystals so they can be suspended in the solution, thus growing more or less equally on all sides).

Hope it's helpful

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