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Topic: Acidified with...  (Read 3833 times)

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Offline iyc

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Acidified with...
« on: December 26, 2004, 04:58:10 AM »
Why should we acidified some oxidzing agent like KMnO4, KCr2O7 with dilute H2SO4?  ???Why not using dilute HNO3 or diluteHCl to acidified?

Offline Donaldson Tan

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Re:Acidified with...
« Reply #1 on: December 26, 2004, 09:04:32 PM »
the half reactions for oxidisng process by these reagents are favoured by acidic environment.

You cant use HNO3 or HCl becuase their conjugate based will be oxidised to form hazardous products. Oxidising chloride ions yield chlorine gas and oxiding nitrite ions produce NO2. Both gas are hazardous..
"Say you're in a [chemical] plant and there's a snake on the floor. What are you going to do? Call a consultant? Get a meeting together to talk about which color is the snake? Employees should do one thing: walk over there and you step on the friggin� snake." - Jean-Pierre Garnier, CEO of Glaxosmithkline, June 2006

Offline AWK

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Re:Acidified with...
« Reply #2 on: December 27, 2004, 06:13:58 AM »
HCl reacts with KMnO4 and K2Cr2O7 to produce chlorine.
Sometimes nitric acid is used instead of H2SO4, eg when you oxidise something using PbO2 or sodium bismuthate (NaBiO3) to prevent precipitation
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