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This tag is for questions concerning coordination compounds including but not limited to ligand properties, metal properties, orbital splitting, micro- and macroscopic properties of entire complexes etc. For complexes where carbon monoxide is the only ligand, use the [carbonyl-complexes] tag instead. For organic catalysts or proteins, the tag is applicable if the question is about the metal’s direct coordination sphere.

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What is primary valency

I am sorry to see that they are still teaching these concepts of the 19th century as facts. The concept of primary valence and secondary valence is a translation of Werner's terminology (Nobel) as Hau …
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3 votes
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Reaction of coloured metal complexes with water and sulfuric acid

If a metal is made to react with sulfuric acid, it will form a sulfate salt. When you dissolve those sulfates in water, you would be studying the color of the aquated metal ion. Sulfate is just a coun …
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4 votes
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Ambiguity in definition of primary valency in Werner's theory

George B. Kauffman has edited an excellent book, "Coordination chemistry: A century of progress." It was published as an ACS Symposium Series. In the chapter, he writes, "If history teaches us anythin …
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10 votes

Explanation for why nickel turns green in hydrochloric acid

Anhydrous nickel chloride is yellow. However most simple divalent salts of nickel are green. This should be good enough for high school. The question is poorly worded because it is ambiguous (hopefull …
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4 votes
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Predicting colors of aqueous solutions

There is no simple way to predict beforehand as far as I know. This is a general knowledge type of chemistry question, you will have to know or memorize the colors of common anions and cations. It wil …
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4 votes

Colour of metal complexes with the same type and number of ligands

When electrons come back down they emit the same wavelength of light and that's the colour we see. I think this is a major misconception held by students. The color of these transition metal comp …
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Products of the reaction between chromium(III) chloride, zinc and sulfuric acid

I know that chromium(III) reduces to chromium(II), but I'm not sure about the reaction. Would it be $$\ce{CrCl3·6H2O + Zn -> Cr(H2O)6Cl2 + ZnCl + H2}?$$ Your concept is right and I am glad nobody …
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1 vote
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Crystal field splitting of other orbitals

According to Crystal Field Theory, d-orbitals of central metal atom splits due to non uniform repulsion of ligands around the metal atom. Why isn't p-orbital splitting discussed? To be blunt, the …
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4 votes
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Why does my EBT indicator not turn pink in EDTA titration?

Classical volumetric titrations are meant for relatively clean samples free from organic stuff. Dyes can adsorb on particles, that can interfere. One has to destroy the organic components/colored comp …
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6 votes
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Why is it advised to use neutral ferric chloride solution while performing confirmatory test...

Theory guides and experiment decides (I. M. Kolthoff). Sometimes thermodynamics predicts a reaction but it does not occur very fast because its kinetics is slow. If you dissolve iron (III) chloride in …
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6 votes
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What is the chemical composition of Ferrous Ferrocyanide?

It is not common to find the ferrous ferrocyanide because it oxidizes rapidly. As you can see the remaining salts or pigments are pretty stable in air. This one is white. I quote from a very old Analy …
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2 votes
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Are carboxylic anhydrides in graphene oxides considered adsorption sites for metals? If so, ...

There are no surprises that the metal adsorption literature is silent about carboxylic anhydride on carbon surfaces. These groups do exist on carbon surfaces but as you can guess from the name "anhydr …
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