Asked by Marie
How would you test a solution containing only Co2+ and Fe3+ ions?
Answers
Answered by
DrBob222
It helps us if you stick to the same screen name.
What are you testing the solution for?
What are you testing the solution for?
Answered by
Marie
Group III cations
Answered by
DrBob222
Fe^3+ is in group IIIA (the iron group of group III) and Co^2+ is in group IIIB (the Zn group of group III).
Group IIIA is pptd with NH3 in an NH4Cl solution. I would confirm Fe^3+ by dissolving a small amount of the Fe(OH)3 in HNO3 and adding KCNS. A deep red color due to FeCNS^2+ confirms iron(III).
To the solution from which iron was removed, saturate with H2S to ppt CoS. Dissolve the CoS in a little HNO3, add NaOH. A blue ppt of Co(OH)NO3 that turns pink due to the presence of Co(OH)2 confirms Co(II).
Group IIIA is pptd with NH3 in an NH4Cl solution. I would confirm Fe^3+ by dissolving a small amount of the Fe(OH)3 in HNO3 and adding KCNS. A deep red color due to FeCNS^2+ confirms iron(III).
To the solution from which iron was removed, saturate with H2S to ppt CoS. Dissolve the CoS in a little HNO3, add NaOH. A blue ppt of Co(OH)NO3 that turns pink due to the presence of Co(OH)2 confirms Co(II).
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