September 24, 2021, 09:14:33 AM
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Topic: why use sulphuric acid as solvent for potassium dichromate and K. permanganate?  (Read 4200 times)

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gracie

  • Guest
 Just a quick question on why sulphuric acid is used as the solvent when making up potassium dichromate and potassium permanganate?
 In the case of the KMnO4 i know that HCl is unsuitable as the Cl is an oxidising agent but other than the stability of potassium dichromate in H2SO4, im not sure.
            Thanks.

Garneck

  • Guest
Cl- is a reducing (not oxidising) agent for KMnO4. (Or my chemistry english is getting bad)

I'd say it's because of the same reason. K2Cr2O7 is a strong oxidiser.

Oh, and when they reduce, H+ causes them to reduce to lower oxididation states. In H+, permangate MnO4- reduces to Mn2+, while in OH- only to MnO42-

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