Hoby Wedler helps student Jimmy Cong add baking soda, citric acid and water to a plastic bag at Chemistry Camp 2012. Jimmy is listening and feeling for the evolution of carbon dioxide gas produced when the citric acid and sodium bicarbonate react, indicating the reaction has taken place.

Hoby Wedler helps student Jimmy Cong add baking soda, citric acid and water to a plastic bag at Chemistry Camp 2012. Jimmy is listening and feeling for the evolution of carbon dioxide gas produced when the citric acid and sodium bicarbonate react, indicating the reaction has taken place.

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