[Chemistry] Amphoteric Oxides

• Garrick_3658

  14 Oct 08, 20:01

  I need help with WORD equations.

  At O level, the only oxides we need to know are:

  Aluminium oxide Al2O3

  Zinc oxide ZnO

  Lead (II) oxide PbO

  So assuming that they react with sodium hydroxide,

  Aluminium oxide + Sodium Hydroxide --> Sodium Aluminate + water

  Zinc oxide + sodium hydroxide --> Sodium Zincate + water

  Lead (II) oxide + sodium hydroxide --> Sodium Plumbate + water

  Are the bold words correct?

  If so, do Aluminite, Zincite and Plumbite exist?

  If so, when do we use them?

  Thanks for any help. It is greatly appreciated. :D

• UltimaOnline

  14 Oct 08, 21:37

  Originally posted by Garrick_3658:

  I need help with WORD equations.

  At O level, the only oxides we need to know are:

  Aluminium oxide Al2O3

  Zinc oxide ZnO

  Lead (II) oxide PbO

  So assuming that they react with sodium hydroxide,

  Aluminium oxide + Sodium Hydroxide --> Sodium Aluminate + water

  Zinc oxide + sodium hydroxide --> Sodium Zincate + water

  Lead (II) oxide + sodium hydroxide --> Sodium Plumbate + water

  Are the bold words correct?

  If so, do Aluminite, Zincite and Plumbite exist?

  If so, when do we use them?

  Thanks for any help. It is greatly appreciated. :D

   

  Garrick, at 'O' levels, you need only know (the names, not the formulae of) "Aluminate", "Zincate" and "Plumbate", for amphoteric salts. No "Aluminite, Zincite and Plumbite", rest assured.

   

  Of course, your 'O' level question might give you a question that includes the formula of these amphoteric salts, but the formulae would be given to you as part of the question. You will only be required to answer questions based on the data (including formulae) given; you're not required to memorize the formulae of these amphoteric salts.

   

   

   

• Garrick_3658

  15 Oct 08, 01:09

  Don't mind my words, but you talk as if you had seen the paper already :D At least that's what I felt when I read your post :D Don't take it to heart.

  These salts have a range of different varied formulas, isn't it?

  Anyway, thanks for clearing my doubts! :D

• UltimaOnline

  15 Oct 08, 02:45

  Originally posted by Garrick_3658:

  Don't mind my words, but you talk as if you had seen the paper already :D At least that's what I felt when I read your post :D Don't take it to heart.

  These salts have a range of different varied formulas, isn't it?

  Anyway, thanks for clearing my doubts! :D

   

  

   

  Cya back here in a few months' time for 'A' level chem discussions!