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making sulphate ion visible

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m777182

Chemical
Joined
Sep 1, 2003
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SI
Does anybody know if there exist a compound that would, when applied over a surface, proved the presence of sulphate ion as colored spots?
m777182
 
What is the surface?
A little more details please.
 
Inert smooth ceramics covered with droplets of NaSO4 that were evaporated and left tinny crystals of said Na2SO4.
M777182
 
Here are specific ion test strips for sulphate. They are available through most large chemical supply houses.
I don't have any of my quantitative chemistry books around and I don't know if there is any spot test for sulphate. The old quick and dirty method was to add a little barium chloride to a solution and look for a white precipitate.


 
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