Required Practical - Making a salt from a Carbonate or a salt

Question 1

What is the point of the practical?

Answer 1

To find out how to make a pure, dry sample of a soluble salt from an insoluble carbonate or oxide.

Question 2

What is a salt?

Answer 2

An ionic substance

Question 3

What is soluble?

Answer 3

Something that dissolves in water

Question 4

What is insoluble?

Answer 4

Something that doesn’t dissolve in water

Question 5

Acid + Metal oxide?

Answer 5

metal salt + water

Question 6

Acid + metal carbonate?

Answer 6

metal salt + water + carbon dioxide

Question 7

Method:

Answer 7

• Add the metal oxide or carbonate to a warm solution of acid until no more will react.
• Filter the excess metal oxide or carbonate to leave a solution of salt.
• Gently warm the salt solution so that the water evaporates and crystals of salt are formed.

Question 8

Hazards:

Answer 8

• corrosive acid - eye protection

- Hot equipment - Gloves and be careful

Question 9

What can calcium hydroxide be used to show?

Answer 9

Production of CO2

Question 10

Hydrochloric acid (HCL) makes -

Answer 10

Metal Chlorides

Question 11

Sulfuric acid (H2SO4) makes -

Answer 11

Metal sulphates

Question 12

Nitric acid (HNO3) makes -

Answer 12

Metal nitrates

Question 13

Name 2 methods of testing PH:

Answer 13

• A PH probe

- Universal indicator

Question 14

What does litmus paper do?

Answer 14

It changes colour from Red to Blue or vice versa

Question 15

What does Universal indicator do?

Answer 15

Universal indicator is a mixture of dyes that show a range of colours to indicate how acidic or alkali a substance is.

Question 16

What is a strong acid?

Answer 16

an acid that is fully ionised in water

Question 17

A strong acid has what concentration of H+ ions?

Answer 17

A high concentration

Question 18

A strong alkali has what concentration of H+ ions?

Answer 18

A low concentration