Description of experiment
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Needed compounds:
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potassium ferricyanide : K3 [Fe(CN)6]
potassium ferrocyanide : K4 [Fe(CN)6] . 3H2O
chrome alum : KCr(SO4)2 . 12H2O
Class:
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elem=Cr,Fe
coordination
Summary:
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Cr (III) reacts with the hexacyanoferrate (II) and hexacyanoferrate (III).
Description:
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Make three solutions in water:
1) Chrome alum: pale purple liquid
2) potassium hexacyanoferrate (II): almost colorless liquid
3) potassium hexacyanoferrate (III): yellow liquid
Add part of (1) to (2): The resulting liquid is green (mossy color) and
clear.
Add part of (1) to (3): The resulting liquid is green (mossy color) and
clear. It appears to be slightly more yellowish. This may be due to the
color of excess hexacyanoferrate (III).