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Homework Help: Redox/Balancing Equation Question

  1. Sep 19, 2009 #1
    CuS precipitates dissolve in hot HNO3. The hot HNO3 oxidizes the sulfide ion in the precipitates to free elemental sulfur, forming NO(g) as its reduction product. For CuS,

    3CuS(s) + 8H(aq) + 2NO3(aq) = 3Cu(aq) + 2NO(g) + 3S(s) + 4H2O(l)

    I have a few questions here.
    Why is HNO3 split up on the reactants side?
    Does it matter what the coefficient is of CuS?
    if so, how do know whether it 3 or 4 or 2?
  2. jcsd
  3. Sep 19, 2009 #2


    User Avatar

    Staff: Mentor

    First: there should be charges in the equation.

    Second: nitric acid is dissociated in water solutions.

    Third: do you know what it means "balanced reaction equation"?

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