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jessica007 - The gas resulting from the citric acid + baking soda reaction is non-combustible carbon dioxide. Using the gas directed through an appropriate nozzle to turn an impeller or vane, as in a wind turbine, would produce some electricity. You could use a DC motor as your generator. Much more complex (and expensive) would be to use a piston engine similar to a model steam engine to turn a shaft which in turn would drive the electric generator. In any case, a fairly large volume of gas would be required to sustain even a small amount of electricity generation.