Precipitation reactions with sodium hydroxide and ammonia

• Precipitation reactions with sodium hydroxide and ammonia
• [Cu(H2O)6 ]2+

  blue solution forms blue ppt

  
• [Mn(H2O)6 ]2+

  very pale pink solution forms pale brown ppt

  
• [Fe(H2O)6 ]2+ (aq) 


  green solution make green ppt

  
• [Fe(H2O)6 ]3+

  yellow/brown solution forms brown ppt

  
• [Cr(H2O)6 ]3+

  green solution form green ppt

  
• • With ammonia when added in limited amounts the same hydroxide precipitates form.
  • The ammonia acts as a base, removes a proton from the aqueous complex and becomes the ammonium ion