Transcript Slide 1
Color Changes for the titration of
NaCl AgNO3
using K2CrO4 indicator
(Mohr’s Method)
Note: Actual colors in the lab may vary somewhat from what is shown. These pictures are intended as a rough guide
only.
Before starting
titration
Cl- sample
+ CrO4-- ind.
Clear Bright
Yellow Soln.
X
During titration
(AgCl is formed)
End Point
Just after
the end point
Cl- sample
+ CrO4-- ind.
+ AgCl ppt
CrO4-- ind.
+ AgCl ppt
+
few
Ag2CrO4 ppt
CrO4-- ind.
+ AgCl ppt
+ Excess
Ag2CrO4 ppt
Turbid Bright
Yellow Soln.
Turbid Dark
Yellow Soln.
The same Color Changes occur
during the titration of
NaBr AgNO3
using K2CrO4 indicator
(Mohr’s Method)
Color Changes for the titration of
NaCl AgNO3
using Fluorescein indicator
(Fajan’s Method)
Note: Actual colors in the lab may vary somewhat from what is shown. These pictures are intended as a rough guide
only.
[A] During titration
(before E.P.)
[B] 1st drop excess of AgNO3
immediately after the E.P.
White ppt in
green fluorescence
Pink ppt
in faint colored solution