# Solubility Curves

Topics: Water, Solubility, Oxygen Pages: 2 (318 words) Published: November 29, 2012
Water
Chemical formula- H2O
State at room temperature- Liquid
Colour- Clear
Melting point- 0oC
Boiling point- 100oC

Water- good solvent and a range of substances will dissolve in it.

What happens when a sugar lump dissolves in water?
When the sugar dissolves...
-The moving water molecules crash into the sugar particles
-The sugar particles then break away from the crystal and into the water -The sugar and water particles then mix and diffuse evenly throughout.

Copper sulphate- blue crystals, hydrated because they have water trapped within them. When they are heated this water evaporates, the crystals become dehydrated and turn white.

Equation for this Reaction.
CuSo4 5H2O ---> CuSo4 + 5H2O

Solute- Solid which is dissolving

Solvent- liquid in which the solute dissolves

Solution- the solute and solvent mixed together

Sodium hydroxide- Soluble
Copper Oxide- insoluble
Calcium hydroxide- Insoluble
Silver iodide- insoluble
Aluminium nitrate- soluble

Most ionic substances will dissolve in water but covalent substances usually wont dissolve.

Solubility of a solute = mass of a solid required to a saturate 100g of water at a particular temperature.

Calculating Solubility
2g potassium chlorate dissolves in 20g water at 28oC what is its solubility?

2 x 100/20 = 10.0g potassium chlorate/100g water

4g potassium sulphate dissloves in 30g water at 50oC what is its solubilty?

4 x 100/30 = 13.33g potassium sulphate/100g water

30g sodium chloride dissolves in 75g water at 10oC what is its solubility?

30 x 100/75 = 40g sodium chloride/100g water

Solubility Of Gases
Carbon dioxide is the gas which is dissolved in fizzy drinks to make the fizz.

What happened when you placed sprite in a boiling tube and gave it a shake? The sprite fizzed up.

What happened after you heated the sprite then gave it a shake again? If fizzed just a little

Carbon dioxide is more soluble in cold liquid.

The solubility of gases...

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