Chemical Forums
Chemistry Forums for Students => Analytical Chemistry Forum => Topic started by: strewart on October 19, 2016, 01:31:26 AM
-
I have an odd solution of silver potassium sulfate (AgKSO4) which I can't find anything about online. I would like to determine concentration of the ions. Is it possible to analyse by gravimetric analysis? I could add NaCl to form AgCl precipitate. I imagine the Ag is pretty low concentration because Ag2SO4 is not very soluble. Then precipitate the SO4 with either Ca2+ or Pb2+.
Would this work?
-
I would do a titration for silver. Or if you have modern equipment AAS or ICP.
-
Then precipitate the SO4 with either Ca2+ or Pb2+
In gravimetric analysis rather Ba2+ is used.
-
I would do a titration for silver. Or if you have modern equipment AAS or ICP.
A method something like this?
Reverse titration, known NaCl solution in flask, unknown Ag+ solution in burette, chromate indicator in flask. AgCl binds preferentially until Cl runs out, then indicator turns orange when silver chromate starts forming.
Then precipitate the SO4 with either Ca2+ or Pb2+
In gravimetric analysis rather Ba2+ is used.
I will see if we have any, I suggested the others because we are much likely to have them.
-
A method something like this?
Reverse titration, known NaCl solution in flask, unknown Ag+ solution in burette, chromate indicator in flask. AgCl binds preferentially until Cl runs out, then indicator turns orange when silver chromate starts forming.
Why reverse titration? Can't you just try a direct approach? And there is no need to invent your own method, determining silver is about as old as modern chemistry.
http://www.titrations.info/precipitation-titration-argentometry-chlorides-Mohr
(Note: direct Mohr method is for chlorides, but when titrating Ag+ with the NaCl everything that has been told there holds).
-
A method something like this?
Reverse titration, known NaCl solution in flask, unknown Ag+ solution in burette, chromate indicator in flask. AgCl binds preferentially until Cl runs out, then indicator turns orange when silver chromate starts forming.
Why reverse titration? Can't you just try a direct approach? And there is no need to invent your own method, determining silver is about as old as modern chemistry.
http://www.titrations.info/precipitation-titration-argentometry-chlorides-Mohr
(Note: direct Mohr method is for chlorides, but when titrating Ag+ with the NaCl everything that has been told there holds).
Thanks for the link. Thats pretty much exactly the method I described anyway so good to see I was on the right track.