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A1 Because water is a solvent, and as long as the material, in this case salt, has less density than the liquid itself, it should sink. But, other solutes like sugar, are denser and water, and will simply sink.

A2 Strictly, there are many many salts, and common table salt, NaCl is the one we meet most commonly. This dissolves readily in water as you remark.

Copper Sulphate 'bluestone' is another salt. Some salts are essentially insoluble, such as many of the Mercury salts - especially the Mercurous ones.

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Rubye Mante

Lvl 13
3y ago

What else can I help you with?