Comments on: FREE O Level Chemistry Exam Questions & Answers (Topical)

By: Ray Seow

Ray Seow — Fri, 04 Sep 2009 17:02:48 +0000

I guess we have to say ACIDIFIED potassium manganate(VII) in order to have the colour change from purple to colourless. In neutral or alkaline condition, brown precipitate of manganese(IV) oxide, MnO2 is obtained instead.

By: sean

sean — Mon, 01 Jun 2009 17:33:35 +0000

Hi saba,

Although titration is carried out in this example, this chemistry question should be placed under the chapter of “REDOX: Reduction & Oxidation”.

Fe2+ are very good reducing agent.

KMnO4 is commonly used to test for a reducing agent.

In this case, KMnO4 change from Purple to Colourless.

Hope this information helps.

To Your Academic Success in Chemistry,
Sean Chua
Master Trainer @ SimpleChemConcepts.com
Author of Up Your Chemistry Grades Now! book

By: saba

saba — Thu, 14 May 2009 10:37:36 +0000

what’s the color change at da end of a titration experiment with fe 2+ ions and potassium manganate? explain please!!

By: SimpleChemConcepts | O Levels Chemistry Tips Blog Marathon - Part I

SimpleChemConcepts | O Levels Chemistry Tips Blog Marathon - Part I — Thu, 23 Apr 2009 16:40:10 +0000

[...] that, please check also the blogposts that i have discussed in 2008 on O Levels Chemistry Exam Questions & Answers (in topical basis). Again, this contains archives (older blogposts) on questions that were discussed for the 2008 [...]