The sulfur dioxide–oxygen–sulfur trioxide equilibrium is of interest to scientists who study acid rain.

The concentrations at the beginning of an experiment are [SO₂] = 0.015 M; [O₂] = 0.012 M; [SO₃] = 1.45 M; K_c = 5.0 = 10⁶ at 700 K. Calculate the reaction quotient, Q, and draw a number line with Q and Kc in the appropriate places. Will the system form more SO₂ or more SO₃, or is the system at equilibrium?

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2SO2(g) + O(g) = 2SO3(g)