Ionization excercise

About ionization, what is not correct?

• Acids and bases are completely ionized in methanol

• Acids and bases are completely ionized in water

• Acids and bases are completely ionized in chloroform

• None is correct

pKa, what is correct?

• Only strong acids or strong bases have pKa.

• pKa indicates the dissociation rate of all substances.

• pKa = -log [H⁺]

• pKa indicates the acidity and alkalinity of substances.

Kw = Ka x Kb is equivalent to which following relationship

• 14 = pKa + pKb

• -log Kw = -log Ka x -log Kb

• pH = pKa + log [A^-]/[HA]

• A buffer solution of a weak base

• pH can be calculated if the salt and base (or acid) molar concentrations are known.

• A- is the acid form

• HA is the acid

• the maximal capacity at [A^-] = [H3O⁺]

• at 0.1 M of A^- and 0.2 M of HA can give maximal buffer capacity

• at 0.1 M of A^- and 0.1 M of HA can give maximal buffer capacity acid form

• The Ka of the acid must be known to prepare the buffer solution with maximal capacity

• the maximal capacity = 0.576 x 0.1

• the maximal capacity = 0.576 x (0.1+0.1)

• maximal buffer capacity acid form cannot be reached.

from pKa1, pKa2, and pKa3 in a solution of pH 7.4, what is correct?

• all acidic and basidic parts will dissociate

• only the part with pKa > 7 will dissociate

• only the part with pKa < 7 will dissociate

• after dissociation, the ionized form with negative charge will be resulted.

from pKa1, pKa2, and pKa3 in a solution of pH 7.4, what is correct?

• all acidic and basidic parts will dissociate

• only the part with pKa > 7 will dissociate

• only the part with pKa < 7 will dissociate

• after dissociation, the ionized form with negative charge will be resulted.