Don't understand how to conduct a sugar/water solution experiment [closed]








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I am helping my some with simple chemistry experiments by following a book on experiments. I don't understand how to conduct one experiment thought (please see pic, experiment 16). It says


1. dissolve sugar in hot water till saturation point
2. let the water evaporate.


How will the water evaporate on its own? Will it evaporate on its own even when I am not heating the water?


[![enter image description here](https://i.stack.imgur.com/sNzza.png)](https://i.stack.imgur.com/sNzza.png)




Evaporation is not the most efficient way of obtaining sugar crystals, because usual sugar is extraordinarily soluble into water. $100$ mL water dissolves $170$ g sugar at $0°$C. And it dissolves $450$ g sugar at $100$°C.


So if you want to get not too tiny sugar crystals, you better try to get them by cooling down the hot saturated solution. As it may take quite a long time to dissolve $450$ g sugar in $100$ mL water at 100°C, I would start to mix $400$ g sugar and $100$ mL water, heat the whole to boiling temperature, until a nice solution is obtained, and simply let it cool down slowly. If the cooling step is fast, you will obtain a lot of tiny crystals, like the usual sugar powder from the market. If the cooling step is slow, individual crystals can find the time to grow slowly.


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