Activity #3 Analysis of Group V Cations Flashcards

You may prefer our related Brainscape-certified flashcards:
1
Q

What are the GV Cations

A

Ammonium, Potassium and Sodium

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Properties of GV Cations

A
  • soluble in water in any form
  • no simple precipitating agent can be used to
    separate them
  • ammonia is always use as a reagent throughout the cation analysis there is always a presence of it in the solution
  • necessary that test for ammonium will be done in the first step of all cation
    analysis
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Confirmation for Sodium ion

A
  • FLAME TEST: Color Intense yellow
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Confirmation for Potassium ion

A
  • FLAME TEST: Lilac (in Cobalt glass)
    Pink (w/o cobalt glass)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Confirmation for Ammonium ion:

A
  • strong base (either NaOH or KOH) to upset the equilibrium forming ammonia gas
  • NH4
    + + OH- . NH3 + H2O
    +
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Confirmatory test for Ammonium gas

A
  • formation of pungent odor or testing with litmus paper (red becomes blue)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly