Answer the following questions regarding the anion tests for halogens. If you ha

Question

Answer the following questions regarding the anion tests for halogens. If you had an unknown that could contain both bromine and iodine, you must test for iodide before testing for bromide. Why? Remember the trends in the periodic table. Why can you not use the iodide or bromide test procedure to identify chloride? Why would the presence of bromide or iodide show up as a false positive in the test for chloride? Include chemical reactions in your explanation. Why might phosphate and carbonate show a positive result in the hydroxide test? Explain using net ionic equations.

Explanation / Answer

c) bromide and iodide interferes in the test of chloride when present in solution, silver nitrate test is used for testing chlorides. They form precipitates of silver chloride with silver nitrate, iodide and bromide may interfere in the test if present as they too will react with silver nitrate to form silver bromide and silver iodide in the solution.

d)these are interfering radicals they form complex with third group reagents and lead to incomplete precipitation of third grp ions.

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