Final answer:
The formula for the conjugate acids of the given bases are NH₄⁺, H₃O⁺, CH₃COOH, and H₂O.
Step-by-step explanation:
The formula for the conjugate acid of each of the given bases is as follows:
a) NH₃: The conjugate acid is NH₄⁺
b) H₂O: The conjugate acid is H₃O⁺ (hydronium ion)
c) CH₃COO⁻: The conjugate acid is CH₃COOH (acetic acid)
d) OH⁻: The conjugate acid is H₂O (water)