Form 1:
Classification of substances

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Solutions/solid-liquid dissolved mixture

Experiment:

To make a solution of copper (II) sulphate (VI) /Potassium mangnate(VII) /sodium chloride

Procedure

Put about 100 cm3 of water in three separate beakers. Separately place a half spatula end full of copper (II) sulphate (VI), Potassium manganate (VII) and sodium chloride crystals to each beaker. Stir for about two minutes.

Observation

Copper (II) sulphate (VI) crystals dissolve to form a blue solution. Potassium manganate (VII) crystals dissolve to form a purple solution. Sodium chloride crystals dissolve to form a colourless solution

Explanation

Sodium chloride crystals dissolve to form a colourless solution

Some solids, liquids and gases dissolve in some other liquids.

A substance/liquid in which another substance dissolves is called solvent.

A substance /solid /gas which dissolves in a solvent is called solute.

When a solute dissolves in a solvent it forms a uniform mixture called solution.

A solute dissolved in water as the solvent exists in another state of matter called aqueous state. Water is referred as the universal solvent because it dissolves many solutes.

A solute that dissolves in a solvent is said to be soluble. Soluble particles uniformly spread between the particles of water/solvent and cannot be seen.

Solute + Solvent --- solution

Solute + Water --- aqueous solution of solute

The solute dissolved in water gives the name of the solution e. g.

1. Sodium chloride solution is a solution formed after dissolving sodium chloride crystals/solid in water. Sodium chloride exists in aqueous state after dissolving.

Sodium chloride + Water -> Sodium chloride solution

NaCl(s) + H2O(l)-> NaCl(aq)

2. Ammonia solution is a solution formed after dissolving ammonia gas in water.

Ammonia exists in aqueous state after dissolving.

Ammonia gas + Water -> aqueous ammonia

NH3 (g) + H2O(l)-> NH3 (aq)

3. Copper (II) sulphate (VI) solution is a solution formed after dissolving Copper (II) sulphate (VI) crystals/solid in water. Copper (II) sulphate (VI) exists in aqueous state after dissolving.

Copper (II) sulphate (VI) + Water -> Copper (II) sulphate (VI) solution

CuSO4(s) + H2O(l)-> CuSO4 (aq)

4. Potassium manganate(VII) solution is a solution formed after dissolving Potassium manganate(VII) crystals/solid in water.

Potassium manganate(VII) exist in aqueous state after dissolving.

Potassium manganate(VII) + Water -> Potassium manganate(VII) solution

KMnO4(s) + H2O(l)-> KMnO4 (aq)

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