concept of dissolving (in water) 10 pts~

jason

2006-12-08 3:24 am

Actually wt is dissolving? What does it mean by soluble in H2O? Many questions about dissolving in water......

Some electrolytes (e.g. NaCl) dissolve in H2O and and ions become mobile.
(BTW, are all electrolytes soluble in H2O?)

Sugar is soluble in H2O 2.(BTW, why do sugar dissolve in hot water but hard to dissovle in cold water?)

What the difference between dissolving table salt and sugar in H2O?
After dissolving, what's happened to solute molecules and H2O molecules?

更新1:

just NaCl into mobile ions sugar into ??? They are all called dissoling in water? How many types of dissolving in water? definition?

回答 (1)

教你開智慧

2006-12-08 7:40 pm

✔ 最佳答案

Dissolving means solute（e.g.NaCl）dissloves in solution（e.g.water）.

Are all electrolytes soluble in water? It depends on the polarity（極性）of the electrolytes. If the polarity of the electrolyte is low, it cannot dissolve in water.

Hot water dissolves sugar easier than cold water because the solutes (i.e. sugar) have more kinetic energy (or heat energy) provided by the hot water. The solutes move with higher velocity and collide more frequently with the water molecules. As a result, the solutes dissolve in water molecules more readily.

There are no big difference between dissolving table salt and sugar in water.
After dissolving, sloute dissolves in water molecules.

參考: my knowledge

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