Acid anhydrides, acid rain, air pollution. Wear goggles, lab coat and gloves. Parts 1 and 2 should be performed only by the instructor and only in a fume hood or outdoors. Both of theses gases are considered to be acid anhydrides because the solution becomes acidic when they dissolve.
Sulfur is one of the elements commonly found in coal.
You may illustrate the formation of acid rain by performing the following experiment. Place a couple drops of universal indicator in the bottom of an Erlenmeyer flask and note the color. Measure the pH of the water using a pH probe, universal indicator, or wide range Hydrion pH paper. Working in the fume hood, ignite a clump of sulfur the size of a pea in a deflagrating spoon. The sulfur will burn with a deep blue flame.