© KS3 022 04-Jan-14. Some substances dissolve in water e.g. salt white solid colourless solution

SOLUTIONS

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Some substances dissolve in water e.g. salt

white solid

colourless solution

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Some substances dissolve in water e.g. copper sulfate

coloured solid

coloured solution






Some substances dissolve in water e.g. nickel sulfate

coloured solid

coloured solution






SOLUBLE Dissolves

(e.g. salt in water)

INSOLUBLE Does not dissolve(e.g. sand in water)





Is each substance SOLUBLE or INSOLUBLE in water?

sugar flour

gloss paint

sandglass

salt








When a substance dissolves:

• the solid “disappears” • the solution is see-through• the solution is coloured (if a coloured

solid) or colourless (if a white solid)

When a substance does NOT dissolve:• the solid is still visible in a colourless

liquid or • the liquid is cloudy






SOLUTESubstance dissolving

SOLUTIONSolute dissolved

in solvent

SOLVENTLiquid the solute

dissolves in






There are many solvents:

e.g. water

Saline solution(salt dissolved in water)




There are many solvents:

e.g. ethanol

Iodine tincture(iodine dissolved in ethanol)

used as an antiseptic




Used to dissolve dirt in dry cleaning

There are many solvents:e.g. perchloroethylene




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© KS3 022 04-Jan-14. Some substances dissolve in water e.g. salt white solid colourless solution