Soluble and insoluble substances
Pure substances are made of only one substance eg: water, copper
Mixtures are made of more than one substance eg wood, plastic,
Soluble means the substance dissolves (clear)
insoluble means the substance doesn’t dissolve (cloudy, particles are seen)
Aim:to mix 6 substances in water to find out whether they are soluble or insoluble
Materials:
Equipment Needed: 6 test tubes, test tube rack, 2 rubber stoppers
Chemicals: Copper sulphate, Sodium chloride, Copper carbonate, Sugar, salt, sand
Method:
1. Collect equipment
2. Half fill 6 test tubes with tap water.
3. Go to the chemical container and put a small spoonful in the test tube
4. Stopper and shake
5. Put back in test tube rack
6. Go to the next station
Results.
| Mixture | Initial observation | Observations after 5 mins | Type of mixture (solution or suspension) |
| Copper sulfate & water | Particles disappeared; solution turned blue | Still clear blue | Soluble/solution |
| Sodium chloride & water |
Clear, particles disappeared |
clear | Soluble/solution |
| Copper carbonate & water | Green and cloudy
|
All the green particles fallen to bottom | Insoluble/suspension |
| Sugar & water | Particles disappeared; clear
|
Still clear | Soluble/solution |
| Chalk & water | Murky, white, particles visible
|
White particles settle to the bottom | Insoluble/suspension |
| Sand & water | Murky, particles visable | Sand settles to bottom | Insoluble/suspension |