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Redox question help, final oxidation state

I don’t understand what you do after calculating the moles, can someone help me?
if u look at the equation they’ve given u, in order for the dichromate ions to become reduced to chromium3+ ions, u need 6 electrons. the reacting ratio of dichromate ions to manganese2+ ions is 1:3 so if 1 mole or dichromate ions gain 6 electrons, this is because 3 moles of manganese2+ ions lose the 6 electrons. that means 1 mole of manganese2+ loses 2 electrons each. this changes the oxidation of manganese ions from 2+ to 4+.
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Original post by nnnn6666
if u look at the equation they’ve given u, in order for the dichromate ions to become reduced to chromium3+ ions, u need 6 electrons. the reacting ratio of dichromate ions to manganese2+ ions is 1:3 so if 1 mole or dichromate ions gain 6 electrons, this is because 3 moles of manganese2+ ions lose the 6 electrons. that means 1 mole of manganese2+ loses 2 electrons each. this changes the oxidation of manganese ions from 2+ to 4+.


Thanks for the explanation

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