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Topic: Salt identification  (Read 2165 times)

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Offline shafaifer

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Salt identification
« on: June 12, 2014, 06:26:19 AM »
What is/are the product/(s) of the following reaction:

Co(OH)2(s) + OH-(aq)    (Eq. 1)

I can inform you of the earlier reaction leading up to this one:

[Co(H2O)6]2+(aq) + 2OH-(aq)  :rarrow: Co(OH)2(s) + 6H2O(l)  (Eq 2)

The precipitate formed in (Eq. 2) is blue. This precipitate then turns red/grey as conc. NaOH(aq) is added. What is/are the product/(s) formed in equation 1?

Best regards
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Offline Hunter2

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Re: Salt identification
« Reply #1 on: June 12, 2014, 02:45:00 PM »
Complexing. [Co(OH)4]2- and others
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Offline shafaifer

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Re: Salt identification
« Reply #2 on: June 12, 2014, 05:19:42 PM »
Quote from: Hunter2 on June 12, 2014, 02:45:00 PM
Complexing. [Co(OH)4]2- and others

Thank you very much. My lab manual only tells me that the precipitate, if containing Co2+, will turn red/grey upon addition of very concentrated sodium hydroxide.

Best regards,

Shafaifer
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