Compounds Precipitation

Question 1

Soluble Substances

Answer 1

Substances which dissolve in particular solvents

Question 2

Insoluble Substances

Answer 2

Substances which do not dissolve in particular solvents

Question 3

Solvent

Answer 3

A liquid that a substance dissolves in (usually water)

Question 4

Solute

Answer 4

Substance dissolved

Question 5

Solution

Answer 5

Solute in solvent (mixture)
= solute + solvent

Question 6

Salt

Answer 6

Ionic compound

Question 7

Salt Solution

Answer 7

Soluble salt dissolved in water

Question 8

Mixing Two Different Salt Solutions

Answer 8

No reaction : ions in solution remain free and now new compounds are formed.
Reaction : some of the ions join together to form a new compound that is insoluble. This is called a precipitation reaction.

If one of the salts is insoluble, then it will precipitate from the solution

Question 9

Mixing Two Different Salt Solutions

Answer 9

No reaction : ions in solution remain free and now new compounds are formed.
Reaction : some of the ions join together to form a new compound that is insoluble. This is called a precipitation reaction.

Question 10

Precipitate

Answer 10

Insoluble compounds formed after mixing two salt solutions

Question 11

Precipitation Reaction Formula

Answer 11

AB (aq) + CD (aq) –> CB (s) + AD (aq)
- A and C are different metal cations
- B and D are different non-metal cations
- (aq) means substance in aqueous solution
- (s) mean substance is solid (precipitated)

Question 11

Precipitation Reaction Formula

Answer 11

AB (aq) + CD (aq) –> CB (s) + AD (aq)
- A and C are different metal cations
- B and D are different non-metal cations
- (aq) means substance in aqueous solution
- (s) mean substance is solid (precipitated)

Question 12

Chemical reactions

Answer 12

• A colour change
• Precipitate forming
• Energy being produced (fizzing, burning)
• An odour being produced