滴定
a measured amount of a solution of unknown concentration is added to a known volume of a second solution until the reaction between them is just complete the concentration of the unknown solution (the titer) can then be calculated
量を測定した未知濃度の溶液を容積の分かっている第二の溶液に溶液同士の反応が終了するところまで加える それによって未知の溶液の濃度（力価）が算定できる