Why does Mn+2 not show color?
Understand the Problem
The question is asking about the reason behind the lack of color in the Mn+2 ion. This is typically related to the electronic transitions and the oxidation state of manganese, where Mn+2 has a filled d-subshell that does not allow for color due to the absence of d-d transitions.
Answer
Mn+2 is almost colorless due to spin-forbidden d-d transitions.
Mn+2 does not show color because it's a d5 system and the d-d transitions are spin-forbidden and weak.
Answer for screen readers
Mn+2 does not show color because it's a d5 system and the d-d transitions are spin-forbidden and weak.
More Information
Mn+2 ions are nearly colorless because they have a high spin d5 electronic configuration. The transitions that could produce color are spin-forbidden, making them extremely weak and thus resulting in very faint color.
Tips
A common mistake is to assume that Mn+2 forms completely colorless solutions. It's actually very pale pink, but this is often difficult to see.
Sources
- Why is MnSO4 colourless? - Chemistry Stack Exchange - chemistry.stackexchange.com
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