24小时热门版块排行榜    

查看: 2552  |  回复: 1

miao19901118

新虫 (正式写手)

[求助] 如何正三价铈离子(Ce3+)氧化成正四价的铈离子

如何正三价铈离子(Ce3+)氧化成正四价的铈离子??
氧化剂是什么?如何检测溶液中的Ce4+已经生成和Ce3+已经完全转化为Ce4+?以及化学反应方程式,反应条件与注意事项!(20个金币)
利用CeO2溶解于酸是否可以??如果可以,用浓度为多少的什么酸溶液,?以及化学反应方程式(10个)
Ce4+水溶液中离子的稳定性如何??

[ Last edited by miao19901118 on 2013-7-8 at 22:34 ]
回复此楼
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

R2BBr

木虫 (知名作家)


【答案】应助回帖

★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★
493070060: 金币+1, 鼓励交流,欢迎常来精化版! 2013-08-01 14:06:26
miao19901118: 金币+15, ★★★很有帮助 2013-08-01 15:07:12
http://en.wikipedia.org/wiki/Ceric_ammonium_nitrate  [CAN]

The anion [Ce(NO3)6]2−  is generated by dissolving Ce2O3 in hot concentrated HNO3.

Ce2O3 (無色) + 14 HNO3  --> 2 [Ce(NO3)6]2- (橙红色) + 2 NO2  +  4 H3O+  +  H2O
Ce3+ in Ce2O3  ---> Ce4+ in [Ce(NO3)6]2-
N5+ in HNO3 ---> N4+ in NO2
3O + 42O + 14H + 14 N  ---->  36O + 4O + 4O + 1O + 12H + 2H + 12N + 2N

Ce4+ is a stronger oxidizing agent (E° ~ 1.61 V vs. N.H.E.) than even Cl2 (E° ~ 1.36 V). Few shelf-stable reagents are stronger oxidants. In the redox process Ce(IV) is converted to Ce(III), a one-electron change, signaled by the fading of the solution color from orange to a pale yellow (providing that the substrate and product are not strongly colored). CAN is useful as an oxidant for many functional groups (alcohols, phenols, and ethers) as well as C–H bonds, especially those that are benzylic. Alkenes undergo dinitroxylation, although the outcome is solvent-dependent. Quinones are produced from catechols and hydroquinones and even nitroalkanes are oxidized.
2楼2013-08-01 12:43:58
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
相关版块跳转 我要订阅楼主 miao19901118 的主题更新
信息提示
请填处理意见