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Author: Subject: Cobalt chloride making
Hazard to Self

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[*] posted on 8-11-2022 at 12:33
Cobalt chloride making

From Wiki: Cobalt chloride heptahydrate can be synthesized by reacting two moles of hydrochloric acid with one mole of cobalt carbonate.

From other posts:
cobalt chloride by dissolving the hydroxide or carbonate. If it is Co(III) hydroxide, then you need to dissolve in a presence of a reducing agent such as H2O2.

but I got no Cobalt salt, but Cobalt metal.
Can I react it with HCL directly? (H2O2 is needed?)
Heat is needed?

or need to make a salt and then HCL?


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Mood: It's chromium time.

[*] posted on 8-11-2022 at 13:54

Cobalt should react with HCl just fine.

An alternative scheme would be to dissolve in nitric acid, precipitate cobalt carbonate and then react that with HCl. But I see little point in this. It would mean less HCl to evaporate off your product.

In my experience, CoCl2 is used in very small quantities. A little goes a long way. My advice would be to make a few grams and store it for later projects.
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[*] posted on 8-11-2022 at 15:18

Cobalt metal with react with HCl, but the reaction is very slow (days) at room temperature. And of course you need good ventilation because you don't want a mist full of cobalt in the lab from the hydrogen bubbles during the long time the reaction is occurring.
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