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Color changes Transition metals-Unit 6 chemistry
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JacobBob
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In part c
They add drops of KMnO4 to a solution which contains Fe2+ ions and they ask about the color change
When I read the question
I thought, the color change they want is the color change of the solution but turns out
They want the color change of the KMnO4 ( from the MS)
How can I tell ?
In part c
They add drops of KMnO4 to a solution which contains Fe2+ ions and they ask about the color change
When I read the question
I thought, the color change they want is the color change of the solution but turns out
They want the color change of the KMnO4 ( from the MS)
How can I tell ?
Last edited by JacobBob; 3 years ago
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memeking
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JacobBob
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#3
(Original post by memeking)
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memeking
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#4
Because you are adding the MnO4 to the solution in the flask, which is Fe2+. At the end it will be pink (Mn2+)
However, it you were to add the Fe2+ to the MnO4, the MnO4 would be purple, and at the end will be pink again (Mn2+).
However, it you were to add the Fe2+ to the MnO4, the MnO4 would be purple, and at the end will be pink again (Mn2+).
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JacobBob
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#5
But the answer in the mark scheme is purple to colorless .
shouldn’t the brown color of Fe3+ overpower any other color anyway ?
shouldn’t the brown color of Fe3+ overpower any other color anyway ?
(Original post by memeking)
Because you are adding the MnO4 to the solution in the flask, which is Fe2+. At the end it will be pink (Mn2+)
However, it you were to add the Fe2+ to the MnO4, the MnO4 would be purple, and at the end will be pink again (Mn2+).
Because you are adding the MnO4 to the solution in the flask, which is Fe2+. At the end it will be pink (Mn2+)
However, it you were to add the Fe2+ to the MnO4, the MnO4 would be purple, and at the end will be pink again (Mn2+).
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