reaction problem

Question

我想問concentrated sulphuric acid 在什麼情況下會react and redow

dilute sulphuric acid

conc nitric acid

dilute nitric acid

它們會不會react with acidicfied potassium　ｐｅｒｍａｎｇａｎａｔｅ?

Acidified potassium permanganate 能react with sodium sulphite,why?

能不能react 或者redox 是根據什麼原則呢?

Answer 1

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Redox reaction 係consist of Oxidation and Reduction

involve change in oxidation number of atoms

一個Oxidizing Agent 同 一個Reducing Agent 做反應

Oxidizing Agent做Reduction (半個反應)

Reducing Agent做Oxidation (半個反應)

呢兩個加埋就叫 Redox reaction

concentrated sulphuric acid

dilute sulphuric acid

conc nitric acid

dilute nitric acid

以上都係Oxidizing Agent

佢地之間係唔會有反應

以上4個acid係唔會同Acidified potassium permanganate有反應

Acidified potassium permanganate都係Oxidizing Agent

sulphite ion係Reducing Agent

Acidified potassium permanganate係strong Oxidizing Agent

sulphite ion做Oxidation

Acidified potassium permanganate做Reduction

sulphite ion 半方程式(Oxidation)為:

SO2 + 2H2O ----- SO4^2- + 2e^- + 4H^+

Acidified potassium permanganate 半方程式(Reduction)為:

MnO4^- + 8H^+ + 5e^- ----- Mn^2+ + 4H2O

將兩條加埋就係

5S03^2- + 2MnO4^- + 2H2O ----- 5SO4^2- + 2Mn^2+ +4H^+

Source(s): 自己~~~~~~有咩唔明再問