Identify the parent acids and bases of the following salts. Name each salt. $N a_{2} C O_{3}, N a_{2} S O_{4}, C a C O_{3}, C u S O_{4}, A l_{2} {(S O_{4})}_{3}$ .

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Solution

The parent acids in the given salts are:
An acid is a substance which gives $H^{+}$ ions when dissolved in water. The $p H$ of acids is less than 7. Some examples of acids are, $H_{2} S O_{4}, H C l, H N O_{3}, H_{2} C O_{3}$
A base is a substance which gives hydroxide ions when dissolved in water. The $p H$ of bases is more than 7. Some examples of bases are, $N a O H, K O H$ .
The reaction of acid and base gives a salt. For the formation of salts, the anionic part of acid and cationic part of base is involved.
The parent acids and bases in given compounds are:
1. $N a_{2} C O_{3} -$ Sodium Carbonate (salt), Acid = $H_{2} C O_{3}$ and Base = $N a O H$
2. $N a_{2} S O_{4}$ -Sodium Sulphate (salt), Acid = $H_{2} S O_{4}$ and Base = $N a O H$
3. $C a C O_{3}$ - Calcium Carbonate (salt), Acid = $H_{2} C O_{3}$ and Base = $C a {(O H)}_{2}$
4. $C u S O_{4}$ - Copper Sulphate (salt), Acid = $H_{2} S O_{4}$ and Base = $C u {(O H)}_{2}$
5. $A l_{2} {(S O_{4})}_{3}$ - Aluminium Sulphate (salt), Acid = $H_{2} S O_{4}$ and Base = $A l {(O H)}_{3}$

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