Topic: Chemistry of hexaaquacobalt(II) with Potassium Nitrite and Acetic Acid (Read 7952 times)

Guest · « **on:** March 31, 2008, 07:22:34 AM »

In a laboratory "experiment" I added KNO₂ (potassium nitrite) to [Co(H₂O)₆]Cl₂ (hexaaquacobalt(II) Chloride). This gave a yellow precipitate which I have deduced to be "Cobalt Yellow" - [Co(NO₂)₆]K₃.

To this was added 2M acetic acid, causing a grey precipitate. I can't find this anywhere in previous textbooks, and I was wondering if anyone could tell me what the grey precipitate was?

Arkcon · « **Reply #1 on:** March 31, 2008, 07:56:03 AM »

The chemical reactions are unknown to me, but I can guess based on the chemical elements involved, 'tho I admit my guess may be far-fetched. Can you guess? And how can you test it?

AWK · « **Reply #2 on:** March 31, 2008, 11:01:57 AM »

CoCl2 + 7KNO2 + 2CH3COOH = K3[Co(NO2)6](s) + NO + 2KCl + 2CH3COOK + H2O
Diluted acetic acid is needed for synthesis of yellow solid

Topic: Chemistry of hexaaquacobalt(II) with Potassium Nitrite and Acetic Acid (Read 7952 times)

Guest

Chemistry of hexaaquacobalt(II) with Potassium Nitrite and Acetic Acid

Arkcon

Re: Chemistry of hexaaquacobalt(II) with Potassium Nitrite and Acetic Acid

AWK

Re: Chemistry of hexaaquacobalt(II) with Potassium Nitrite and Acetic Acid

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