Strong and Weak are terms that refer to degree of ionization, not concentration. Repeat light bulb glow test for solutions of hydrochloric acid, ammonium hydroxide, and acetic acid. Observe some indicators in action, and make note of the colors. The initial solutions will be basic. Solid CO 2 will be added to cause a change to acidic conditions.
Indicators are weak acids and bases, having varying degrees of dissociation.
M NaOH 4. Concentrations of hydrogen and hydroxide ions can vary over a very wide range of magnitudes. A much more convenient way of dealing with this wide range of numbers is made possible by using a log scale of concentrations, i.e., the pH scale. Determine the pH and pOH for each of the solutions in problems 1 - 4 above. Similar options are possible for all other substances appearing in the equilibrium expression.