TEACHING LABORATORY
Chemical Reactions
VIRTUAL CHEMLAB
PERFORMANCE LABORATORY
The Laboratory
Challenge
The MCQ Challenge
ChemQuest
  VIRTUAL CHEMLAB
 


Cation Lab Manual

b) Some metal ions e.g. Cu2+ and Zn2+ form complexes with ammonia.
Hence, their hydroxides are soluble in excess ammonia.

 
Cu2+ (aq) ion

1a) Add dilute NH3 (aq) until a change is observed.

1b) Add an excess of dilute NH3 (aq) to the mixture in test 1(a).

View video 1a

View video 1b
Observation

a) blue precipitate formed,

b) ppt. dissolved in excess NH3 (aq) to form a dark blue solution.
Name and formula of precipitate Copper(II) hydroxide, Cu(OH)2
Type of chemical reaction(s)

a) Precipitation of Cu(OH)2

b) Formation of complex salt solution, i.e. Cu(OH)2 reacts with excess ammonia solution to form a soluble salt.
Ionic equation Cu2+ (aq) + 2OH- (aq) ---> Cu(OH)2 (s)

 

Prev     1     2     3     4     5     6     Next

 
 

Copyright © 2001 Crescent Girls' School, ASKnLearn.com Pte Ltd.

All rights reserved.