Micro-chemical test for chloride: Difference between revisions
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== Literature == | == Literature == | ||
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[[category:Bläuer,Christine]][[category:inProgress]][[category: microchemistry]] | [[category:Bläuer,Christine]][[category:inProgress]][[category: microchemistry]] | ||
Revision as of 12:16, 30 May 2012
Author: Christine Bläuer
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back to Micro-chemical testing
More information about the necessary equipment and materials see Article Micro-chemistry.
Procedure[edit]
The drop to be tested is acidified with very little diluted nitric acid and then a drop of silver nitrate solution is added. If Cl- is present a white precipitate of AgCl will form instantly. After exposure to light this will turn brown with time Bild. Detection limit for Cl- = 0.05µg
Further observations[edit]
If sulfate is present typical silver sulfate crystals can be observed in the test drop. If in addition to chloride sodium or potassium are present in the solution, typical isotropic cubes of NaCl or likewise isotropic rectangular, cruciform structures of KCl will form near the fringe of the drop of the pure salt solution.
Ions that may inhibit the test or affect its delicacy:[edit]
Iodide and bromide also will produce white precipitations with silver nitrate solution, but these ions usually are not present in salt efflorescence from buildings.
Literature[edit]
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