11. a. Amphoteric
12. a. NH₄⁺, H₂O
Explanation:
11. A substance that can act as either an acid or a base is said to be amphoteric.
Water is an amphoteric substance because it can reaction with either and acid or a base.
HCl + H₂O → Cl⁻ + H₃O⁺
NH₃ + H₂O → NH₄⁺ + OH⁻
12. What are the acids in the following equilibrium reaction?
NH₃ (aq) + H₂O (l) → NH₄⁺ (aq) +OH⁻ (aq)
H₂O water is acid 1
NH₄⁺ ammonium ion is acid 2
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amphoteric substances
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