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KMnO4,K2Cr2O7要acidified?
係用咩acid黎acidified?
2006-10-18 17:38:13 · 5 個解答 · 發問者 2003 2 in 科學 ➔ 化學
Consider hydrochloric acid(HCl)
The chloride ion will undergo reduction to become chlorine gas
redox reaction occur when acidify KMnO4,K2Cr2O7 , it cannot be used
Consider nitric acid(HNO3)
The nitrate ion will reduce to nitrogen dioxide
The result is just like HCl ,it cannot be uesd
Finally , only sulphuric acid can use
2006-10-18 18:30:34 · answer #1 · answered by Alan 2 · 0⤊ 0⤋
ywh1472004的答案非常正確，相信他吧！
2006-10-21 11:15:15 · answer #2 · answered by ? 7 · 0⤊ 0⤋
Acidification can increase the oxidation strength of the reagent (H+ as catalyst)
KMnO4 can be acidified by H2SO4, but not HCl, as Cl2 will be eliminated.
K2Cr2O7 can be acidified by H2SO4 and HCl though.
2006-10-18 18:21:30 · answer #3 · answered by pf_kcmk_09112001 3 · 0⤊ 0⤋
唔可以use dil HCl
because the Cl ion will act as Reducing agent
so use dil H2SO4
2006-10-18 18:08:09 · answer #4 · answered by Yiu Chung 2 · 0⤊ 0⤋
因為在它們的氧化還原過程中需要有H+才可以產生反應, acidified就是要提供所需的H+
可以用dil HCl
2006-10-18 17:59:36 · answer #5 · answered by ? 3 · 0⤊ 0⤋