用摩尔法测定溶液中的氯离子时,铬酸钾指示剂加入过多或过少,即 CrO_4~(2-)离子浓度过高或过低,那么铬酸银沉淀的析出,就会提前或推迟。如果加入铬酸钾浓度过高,会妨碍铬酸银沉淀的观察,影响终点的判断。反之,则终点变化不明显。这样滴定就会产生一定的误差。本文将讨论加入铬酸钾的量多少恰 Moore method for the determination of chloride ions in the solution, potassium chromate indicator added too much or too little, that CrO_4 ~ (2) ion concentration is too high or too low, then precipitation of silver chromate precipitate, it will advance or put off. If the addition of potassium chromate concentration is too high, it will prevent the observation of silver chromate precipitation, affecting the judgment of the end point. On the contrary, the end point change is not obvious. This titration will produce some error. This article will discuss the amount of potassium chromate added just how much