When we talk about acids and their tendency to dissociate in water, we use a term called pKa. This is the measure of the acidity of a compound, and it tells us exactly how much of the compound will give up a hydrogen ion when it is in an aqueous solution (i.e., mixed with water). The lower the pKa value, the more acidic the compound is, and the more completely it will dissociate in water. Essentially, a lower pKa means that the acid will more readily give up its hydrogen ions in water, resulting in a greater degree of dissociation.What is the molecule's pKa value?