What reactions does Br- have, ones that would distinguish it as a anion? As in a anion analysis scheme?
To determine the reactions of Br- (bromide) for an anion analysis scheme, we need to consider specific reactions that can identify the presence of bromide ions. Here is a step-by-step guide on how to determine the reactions of bromide:
1. Preliminary Test:
- Insolubility test: Add a few drops of a dilute solution of a soluble bromide salt to a test tube containing dilute nitric acid (HNO3) or silver nitrate (AgNO3). If a white precipitate forms, it indicates the presence of bromide ions (Br-). The precipitate is silver bromide (AgBr).
2. Confirmatory Test:
- Flame Test: Perform a flame test by heating a platinum wire loop or a wooden splint soaked in a hydrochloric acid (HCl) solution to a hot Bunsen burner flame, then dip it into a sample containing a bromide compound. The flame should turn pale yellow/orange due to the presence of bromide ions.
3. Additional Confirmatory Test (if required):
- Chloroform Test: Add a few drops of chloroform (CHCl3) to a test tube containing the bromide solution. Shake vigorously and allow it to separate into layers. The chloroform layer should develop a yellow color, indicating the presence of bromide ions.
It's important to note that the specific reactions and tests may vary depending on the analytical scheme and the presence of other anions in the sample. Following this process will help to identify Br- ions specifically.