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A Group III unknown is colorless. What cations are probably absent? Why should one not rely...

A Group III unknown is colorless. What cations are probably absent? Why should one not rely definitely upon such an observation?

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Answer #1

The solution of Group III:

Co2+, Ni2+, Fe3+, Mn2+, Cr3+, Al3+, Zn2+

Co2+ = red

Ni2´= green

Fe3+ = yellow/orange

Mn2+ = transparent, slightly pink

Cr+3 = black

Al+3 = transparent

Zn2+ = transparent

Most likely:

Zn2+, Al3+ and even Mn+2 could be in solution

Colo depends in concentration, if concentraiton is too low, then it will seem to fade or be transparent.

Also, combination of different colors such as yellow + blue will form green, which might confuse us as well

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