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Acid-Base Character of Group 4 Oxides
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Down Group 4

  • The metallic character increases

  • The +2 oxidation state gets more stable and the +4 oxidation state less stable

Acid Base reactions of Group 4 Oxides

CO2

Weakly Acidic

CO2 + H2O --> H2CO3

SiO2

Acidic

SiO2 + 2NaOH --> 2Na2SiO3 + H2O

SnO and SnO2

Amphoteric

As an acid: SnO + 2NaOH + H2O --> Na2Sn(OH)4
As a base: SnO + 2HCl --> SnCl2 + H2O
SnO2 + 4HCl --> SnCl4 + 2H2O

PbO and PbO2

Amphoteric

As a base: PbO + 2HCl --> PbCl2 + H2O
As an acid: PbO + NaOH + H2O --> Na2Pb(OH)4 As a base (at room temperature): PbO2 + 4HCl --> PbCl2 + Cl2 + H2O

Other Notes in this Category

  1. Acid Base Character of Period 3 Oxides
  2. Acid-Base Character of Group 4 Oxides
  3. Covalent Radius
  4. Defintions: Electrophile, nucleophile, radical
  5. Equations of reactions of period 3 elements with oxygen and chlorine.
  6. Ionization Energy and Electron Affinity
  7. Ionization Energy and Electron Affinity 2
  8. Thermal Stability of gp1 and 2 carbonates.

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