Monobasic Acids also know as monoprotic acids

These are acids which yield one free hydrogen ion in solution for each molecule of acid ionized. An example of a monobasic acid is hydrochloric acid (HCl).
HCl → H⁺ + Cl ^–

Dibasic Acids also know as diprotic acids
These are acids which yield two free hydrogen ions in solution for each molecule of acid ionized. An example of a dibasic acid is sulphuric acid H₂SO₄.
H₂SO₄ → 2H⁺ + SO₄^2-

Tribasic Acids also know as triprotic acids
These are acids which yield three free hydrogen ions in solution for each molecule of acid ionized. An example of a tribasic acid is phosphoric acid (H₃PO₄).
H₃PO₄ → 3H ⁺ + PO₄^3-