This
activity explains the nature of metal oxides, whether they are acidic or basic.
What happens when copper oxide reacts with dilute hydrochloric acid?
Aim of the activity
To observe
the chemical reaction between copper oxide and HCl
Materials used in the activity
|
S.N. |
Materials |
|
1 |
Copper
oxide Powder |
|
2 |
Dilute
HCl |
|
3 |
Glass
/Beaker |
|
4 |
Dropper |
|
5 |
Gloves/goggles |
Procedure
We take a small amount of copper oxide in a beaker, and
add dilute hydrochloric acid slowly with the help of a dropper and stir continuously.
We keep adding acid until copper oxide reacts completely.
Observation
1. Copper oxide is a black-coloured powder.
2. It
turns blue-green after reacting with `HCl`
3. No
gas is evolved during the chemical reaction
Explanation
Copper
oxide reacts with dilute hydrochloric acid to produce salt (`CuCl_2`) and water. So
this indicates that copper oxide (metals oxides) are basic in nature.
`CuO + 2HCl →CuCl_2 + H_2O`
Conclusion
This
activity shows that metal oxides are basic in nature.
Multiple Choice Questions
1. What is the colour of copper oxide powder?
a) White
b) Black
c) Green
d) Blue
Correct
answer – (b) Black
2. What is the nature of copper oxide?
a) Acidic
b) Neutral
c) Basic
d) Amphoteric
Correct
answer – (c ) Basic
3. What type
of chemical reaction takes place between copper oxide and hydrochloric
acid?
a) Displacement
reaction
b) Decomposition reaction
c) Combination
reaction
d) Neutralisation reaction
Correct
answer – (d) Neutralisation reaction
4. What is
the colour of the solution in this activity?
a) Red
b) Blue-green
c) Yellow
d) White
Correct
answer – (b) Blue-green
5. Name
the salt formed when copper oxide reacts with HCl.
a) Copper
sulphate
b) Copper chloride
c) Copper carbonate
d) Copper nitrate
Correct
answer – (b) Copper chloride
Related Topics -
1. Activity 2.8
2. Activity 2.6
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