This shows my simple test for peroxide concentration---necessary because stock solutions can lose their punch. The test tube received a few milliliters of hydrogen peroxide solution, which has now decomposed to release oxygen, filling the balloon. Although you can't see it in this picture, my fingers are holding in place a fat rubber band wrapped around the mouth of the balloon to keep a tight seal on the tube. Once all the peroxide has broken down, the balloon is carefully removed and the oxygen is measured by releasing it into an inverted graduated cylinder filled with water. [Next]
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