To Conduct Demonstration Lift the balloons one at a time so that the Mg falls into the HCl in each flask. Swirl to speed up reaction. Make sure all the Mg is emptied out of the balloon. Each flask ...

Effervescence is an indicator of a chemical reaction taking place. Watch this video to see how magnesium and dilute hydrochloric acid react to produce bubbles of hydrogen gas.

A cotton swab is dipped into concentrated hydrochloric acid (producing hydrogen chloride gas) while a second on is dipped into concentrated aqueous ammonia (producing ammonia gas). Both cotton swabs ...