Define buffer capacity. a. buffer capacity is the amount of acid or base that can be added to a buffer without destroying its effectiveness. b. buffer capacity is the amount of acid that can be added until all of the base is used up. c. buffer capacity is the amount of base that can be added until all of the acid is used up. d. buffer capacity is the amount of acid that can be added until all of the acid is used up. e. buffer capacity is the amount of base that can be added until all of the base is used up.