© 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

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Some substances dissolve in water e.g. nickel sulfate

coloured solid

coloured solution

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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

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SOLUTESubstance dissolving

SOLUTIONSolute dissolved

in solvent

SOLVENTLiquid the solute

dissolves in

There are many solvents:

e.g. water

Saline solution(salt dissolved in water)

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There are many solvents:

e.g. ethanol

Iodine tincture(iodine dissolved in ethanol)

used as an antiseptic

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Used to dissolve dirt in dry cleaning

There are many solvents:e.g. perchloroethylene

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