2) Phenolphthalein (C20H1404) is a dye very commonly used as indicator in acid-base titrations. The simplified generic expression for the dissociation of this molecule in water is shown in the equation below, where Hin
represents the phenolphthalein molecule and In is the phenolphthalein ion. Their appearance and relevant
properties are also shown below.
HIn (S) + H20 (1) = H30* (aq) + In" (aq)
a. Can this equilibrium be controlled by changing the pH of the solution? Briefly explain.
b. What color do you expect to see in the solution when you add acid to it? Briefly explain.

methyl orange is an indicator

a 20-cm-long, cylindrical graphite (pure carbon) rod is inserted into an oxidizing atmosphere at 1145 k and 1.013 x 105 pa pressure. the oxidizing process is limited by the diffu- sion of oxygen counterflow to the carbon monoxide that is formed on the cylindrical surface.

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.