Activity 2.14
- Collect the following salt samples – sodium chloride, potassium nitrate, aluminium chloride, zinc sulphate, copper sulphate, sodium acetate, sodium carbonate and sodium hydrogen carbonate (some other salts available can also be taken).
- Check their solubility in water (use distilled water only).
- Check the action of these solutions on litmus and find the pH using a pH paper.
- Which of the salts are acidic, basic or neutral?
- Identify the acid or base used to form the salt.
- Report your observations in Table 2.4.
|
Salt |
pH |
Acid used |
Base used |
|
|
|
|
|
✅ Answer:
|
Salt |
pH |
Acid used |
Base used |
|
Sodium chloride |
7 |
HCl |
NaOH |
|
Potassium nitrate |
7 |
HNO3 |
KOH |
|
Aluminium chloride |
7 |
HCl |
Al(OH)3 |
|
Zinc sulphate |
7 |
H2SO4 |
Zn(OH)2 |
|
Copper sulphate |
<
7 |
H2SO4 |
Cu(OH)2 |
|
Sodium acetate |
>
7 |
CH3COOH |
NaOH |
|
Sodium carbonate |
>
7 |
H2CO3 |
NaOH |
|
Sodium hydrogen carbonate |
>
7 |
H2CO3 |
NaOH |