D. Substance that can act as either an acid or a base is amphoteric. Strong acid and strong base always found on same side of eq. Ka is a meas of the strength of an acid. The greater the value of Ka, the stronger the acid and the greater the degree of dissociation.
Polyprotic acids lose their H one at a time.
Each step has its own Ka. The smaller the value of Kb, the weaker the base. A salt is an ionic comp that forms from an acid base neutralization rxn. Only the H in a very polar bond is ionizable. C. Oxyacids contain H,O and another ele.