Topic: Cu3[Fe(CN)6]2 + NaOH (Read 7838 times)

sliekius · « **on:** May 15, 2013, 03:58:59 PM »

Hello,

The reaction was supposed to be

Cu₃[Fe(CN)₆]₂ + 6NaOH

3Cu(OH)₂ + 2Na₃[Fe(CN)₆]

and the result was (I'm sorry for the bad photo, phone camera did not focus three times in a row, so i just gave up)

It certainly does not look like Cu(OH)₂ has formed. Test tube should have been clean. Professor did not know what has formed there, too.

If anyone could tell what happened there, I would be very grateful.

Borek · « **Reply #1 on:** May 15, 2013, 05:09:56 PM »

Quote from: sliekius on May 15, 2013, 03:58:59 PM

Cu₃[Fe(CN)₆]₂ + 6NaOH 3Cu(OH)₂ + 2Na₃[Fe(CN)₆]

Can you elaborate on the experiment? Inorganic reactions in water by Ronald Rich suggests Cu₃[Fe(CN)₆] is insoluble. Have you tried to dissolve it in the NaOH solution, expecting metathesis reaction?

sliekius · « **Reply #2 on:** May 16, 2013, 09:00:41 AM »

Yes, exactly that.

After pouring NaOH on Cu₃[Fe(CN)₆]₂, it all dissolved and the mixture turned greenish-blue color, but after few seconds this precipitate formed. Exactly the same experiment was done with Cu₂[Fe(CN)₆], everything was like it was expected (Cu(OH)₂ precipitated).

opsomath · « **Reply #3 on:** May 16, 2013, 10:13:41 AM »

Did it immediately degrade to CuO?

AWK · « **Reply #4 on:** May 16, 2013, 11:40:26 AM »

NaCu[Fe(CN)6] ?

Topic: Cu3[Fe(CN)6]2 + NaOH (Read 7838 times)

sliekius

Cu3[Fe(CN)6]2 + NaOH

Borek

Re: Cu3[Fe(CN)6]2 + NaOH

sliekius

Re: Cu3[Fe(CN)6]2 + NaOH

opsomath

Re: Cu3[Fe(CN)6]2 + NaOH

AWK

Re: Cu3[Fe(CN)6]2 + NaOH

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