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# Nickel Oxidation States and Unbalanced Reactions

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1. Nickel commonly exists in the +2 and +3 oxidation states. If you are given a 1.47g sample of a mixture of the Ni(II) and Ni(III) salts; determine the % by weight of Ni(II) in the mixture if it required 20.31 mL of .050M KMnO4 to titrate to the end point.

The unbalanced reaction is: Ni2+ + MnO4  Ni3+ + Mn2+ (acidic)

2. Sodium dichromate, Na2Cr2O7, is a strong oxidizing agent. A solution is prepared, standardized and found to be .0360M. This solution is then used to titrate a sample of a Sn(II) salt weighing .986g It requires 35.39mL of the sodium dichromate solution to reach the endpoint. Determine the % by weight of the salt that is in Sn(II).

The unbalanced reaction is: Sn2+ + Cr2O7(2-)  Cr3+ + Sn4+ (acidic)

https://brainmass.com/chemistry/oxidation-reduction-and-electrochemistry/nickel-oxidation-states-unbalanced-reactions-277193

#### Solution Preview

1. Nickel commonly exists in the +2 and +3 oxidation states. If you are given a 1.47g sample of a mixture of the Ni(II) and Ni(III) salts; determine the % by weight of Ni(II) in the mixture if it required 20.31 mL of .050M KMnO4 to titrate to the end point.

The unbalanced reaction is: Ni2+ + MnO4  Ni3+ + Mn2+ (acidic)

The balanced equation is:

8H+ + 5Ni2+ + MnO4-  5Ni3+ + Mn2+ ...

#### Solution Summary

Nickels oxidation states and unbalanced reactions are examined.

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