Difference between basic and acidic stains?

Answer 1

Acidic oxides form acids with water: eg SO2 + H2O --> H2SO3

Basic oxides form basic salts (alkaline) with water: eg. CaO + H2O --> Ca(OH)2

Amfotheric oxides have both acidic and base properties:

eg. Aluminium oxide is an amphoteric oxide, which means that it displays

both acidic (1) and base (2) properties:

1. Al2O3 + H2O --> 2 Al(OH)2- + 2 H+

2. Al2O3 + H2O --> 2 Al3+ + 3 OH-

Answer 2

An acidic stain has a negatively charged chromogen and a basic stain has a positively charged chromogen.