Identify the base and acid used to form the following salts: a. Zinc sulphate, b. Calcium phosphate, c. Silver acetate, d. Sodium carbonate.

Here are the base and acid used for the formation of each salt:

a. Zinc sulphate ($\text{ZnSO}_4$)

• The cation is $\text{Zn}^{2+}$, which comes from the base zinc hydroxide.
• The anion is $\text{SO}_4^{2-}$, which comes from the acid sulfuric acid. Answer: Base: $\boxed{\text{Zn}(\text{OH})_2}$, Acid: $\boxed{\text{H}_2\text{SO}_4}$

b. Calcium phosphate ($\text{Ca}_3(\text{PO}_4)_2$)

• The cation is $\text{Ca}^{2+}$, which comes from the base calcium hydroxide.
• The anion is $\text{PO}_4^{3-}$, which comes from the acid phosphoric acid. Answer: Base: $\boxed{\text{Ca}(\text{OH})_2}$, Acid: $\boxed{\text{H}_3\text{PO}_4}$

c. Silver acetate ($\text{CH}_3\text{COOAg}$)

• The cation is $\text{Ag}^{+}$, which comes from the base silver hydroxide.
• The anion is $\text{CH}_3\text{COO}^{-}$, which comes from the acid acetic acid. Answer: Base: $\boxed{\text{AgOH}}$, Acid: $\boxed{\text{CH}_3\text{COOH}}$

d. Sodium carbonate ($\text{Na}_2\text{CO}_3$)

• The cation is $\text{Na}^{+}$, which comes from the base sodium hydroxide.
• The anion is $\text{CO}_3^{2-}$, which comes from the acid carbonic acid. Answer: Base: $\boxed{\text{NaOH}}$, Acid: $\boxed{\text{H}_2\text{CO}_3}$