Acetic acid is a weak acid because it only ionises to a minimal extent in solution to produce hydrogen ions. CH3COOH <-> CH3COO- + H+ By definition, a weak acid is a substance which only...
Acetic acid's systematic name is ethanoic acid (CH3COOH)
Hydrofluoric acid's molecular formula is HF a combination of hydrogen and fluroine, which is acidic dissolved in water.