✔ 最佳答案
1. No reaction with water.
- Reaction with dilute HNO3 (forming NO gas);
conc. HNO3 (forming NO2 gas);
conc. H2SO4 (forming pungent SO2 gas)
- Reaction with NaOH --> forming white ppt.
2. It is basic in nature.
3. Br- in MgBr2 is a strong reducing agent.
2011-04-26 20:59:31 補充：
Reaction with dilute HNO3:
2NO3^- + 3Br^- + 8H+ ---> 2NO + 3Br2 + 4H2O
Colourless NO gas is evolved, (which can further react with oxygen in air to form brown NO2 gas). And the solution turns from colourless to brown.
2011-04-26 20:59:41 補充：
Reaction with conc HNO3:
2NO3^- + 2Br- + 8H+ ---> NO2 + Br2 + 4H2O
Brown NO2 gas is evolved. And the solution turns from colourless to brown.
2011-04-26 20:59:45 補充：
Reaction with conc H2SO4:
H2SO4 + 2Br- + 4H+ ---> SO2 + Br2 + 2H2O
Pungent SO2 gas is evolved. And the solution turns from colourless to brown.
2011-04-28 12:15:47 補充：
I know that dilute nitric acid has oxidizing property which can be reduced to colorless NO gas by strong reducing agent, like Br-. But the actual value of cell potential is unknown to me.
2011-04-28 12:15:59 補充：
The answers are based on my theoretical knowledge. If there are any missing/wrong concepts, please tell me and I can correct it.
2011-04-28 12:16:27 補充：
ppt. is the abbreviation of precipitate.
參考: Knowledge is power.
