How can halides be tested for?

Question

Nolan Allen · Accepted Answer

By addition of a soluble silver salt; typically #AgNO_3(aq)#.

#Ag(NO_3)(aq) + X^(-) rarr AgX(s) darr + NO_3^-# #"Silver chloride"# forms a curdy, insoluble white precipitate. #"Silver bromide"# forms a curdy, insoluble cream-coloured precipitate, #"Silver iodide"# forms a fine yellow precipitate. On standing, the precipitate reduces to metallic silver. For further information, view this page. All silver halides are extremely insoluble.

Christian Anderson · Answer

undefined Halides can be tested for using various chemical tests. One common method is the silver nitrate test. When a halide ion (chloride, bromide, or iodide) is mixed with silver nitrate solution, a precipitate forms. The color of the precipitate can indicate which halide is present: white for chloride, cream/yellow for bromide, and yellow for iodide. Additionally, further confirmation tests can be conducted, such as adding ammonia solution to the precipitate, which dissolves the silver chloride but not the silver bromide or silver iodide.

Ava Andrews · Answer

undefined Halides can be tested for using various chemical tests. Here are some common methods:

1. Silver Nitrate Test: Add silver nitrate solution (AgNO3) to the halide solution. Different halides form different colored precipitates with silver nitrate. Chlorides form white precipitate (AgCl), bromides form cream precipitate (AgBr), and iodides form yellow precipitate (AgI).

2. Chlorine Water Test: Add chlorine water (Cl2) to the halide solution. Chlorine water oxidizes bromides and iodides to bromine (Br2) and iodine (I2), respectively. Bromides form an orange color with chlorine water, while iodides form a purple color.

3. Sodium Nitrate and Concentrated Sulfuric Acid Test: Add sodium nitrate (NaNO3) and concentrated sulfuric acid (H2SO4) to the halide solution. This test is specific for chlorides. Chlorides react with sodium nitrate and concentrated sulfuric acid to form chlorine gas (Cl2), which can be identified by its characteristic odor and bleaching effect.

These tests help identify the presence of halides (chlorides, bromides, and iodides) in a given solution.