Assignment:
Question 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)
Question 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)
Provide complete and step by step solution for the question and show calculations and use formulas.