Sno2 forms positively charged colloidal solution in acid medium and negatively charged in basic medium (VSA)

SnO 2 is amphoteric in nature. It reacts with acid eg. HCl to form SnCl4 in the solution. The common Sn+4 ions are adsorbed on the surface of SnO2 particles giving them a positive charge.
SnO2 reacts with a base eg. NaOH to form Sodium Stannate in the solution. The stannate ions are adsorbed on the surface of SnO2 particles giving them a negative charge.

​regards

  • 29
What are you looking for?