Chemistry - Science (Dr. Bob222)

Ammonium metavanadate reacts with sulfur dioxide in acidic solution as follows (hydrogen ions and H2O omitted):
xVO3^–^ + ySO2 → xVO^2+^ + ySO4^2–^
What is the ratio of x : y?
A. 1 : 1
B. 1 : 2
C. 2 : 1
D. 1 : 3
E. 3 : 1

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asked by Ana
  1. x = 2
    y = 1
    How did I do that?
    V on the left has a oxidation state of +5 and on the right it is +4.
    S on the left is +4 and on the right is +6.
    V has changed by 1e
    S has changed by 2e
    So V couple must be multiplied by 2 and S couple by 1 to make each lose/gain 2 electrons.

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    posted by DrBob222
  2. thank you!!

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    posted by Ana

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