Acidified Potassium Dichromate

suzyr · Post by **suzyr** » 30 Oct 2006, 08:37

Hi all
Could anyone please tell me a recipe to make 0.1M acidified Potassium Dichromate, I can't find it in any or our regular recipies.

Thanks Suzyr

Post by **Robb** » 30 Oct 2006, 09:30

Hi Suzyr,

If I could just ask why you wish to make up an acidic Solution of this..

If it is the solution I am thinking about I will have to give you some more info.

Cheers,

Robb.......

JudyM · Post by **JudyM** » 30 Oct 2006, 09:51

Hi Suzyr,

We always use 0.2M rather than 0.1M, but the recipe is as follows:

0.2M Potassium dichromate
Acidified with 25% Sulfuric acid at 1g acid/10ml dichromate

Cheers

Post by **Robb** » 30 Oct 2006, 12:46

Hi Suzyr,

Just to re-iterate what JudyM has mentioned, I would not go any higher in concentrations of 0.2M - 0.5M.

This is due to the fact that you are producing Chromic Acid. This acid at higher concentrations is Toxic and is known as a Carcinogenic compound. very Corrosive and Very poisonous.

Hope this helps..

Robb..........

Mother · Post by **Mother** » 30 Oct 2006, 14:13

For all of you out in Chemtalk land.
Robb is correct in saying Chromic Acid is produced when Potassium Dichromate is acidified.You also need to know that Chromic Acid is banned in all Public Schools!!!! Chemical Safety In Schools Vol.2 explains why, in greater depth.
Cheers
Mother

suzyr · Post by **suzyr** » 31 Oct 2006, 10:04

Hi all
Thanks for your reply's re acidified potassium dichromate, no wonder it is not in the recipe book!
cheers Susan

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