测定阿司匹林含量看起來很簡單,但初次操作時测定結果常超過100%。怎樣避免差誤的發生呢?操作時應注意下列兩點: 1) 加热時的溫度。加热時須在均匀的電熱板上加熱,如電熱板溫度不均,须時時倒换位置,使空白与二份檢品所受的热均相同。先將電熱板加热,然後將裝有阿司匹林與氢氧化鈉液的圓錐燒瓶與空白同時放於電爐上,徐徐煮沸。溫度過高時,沸騰時易致溶 Determination of aspirin content may seem simple, but the initial results of the operation often more than 100%. How to avoid the error occurs? The operation should pay attention to the following two points: 1) The temperature when heating. Heaters must be heated in a uniform heating plate, such as uneven temperature of the heating plate, to be switched from time to time, so blank and two seized goods suffered the same heat. First electric heating plate, and then equipped with aspirin and sodium hydroxide solution conical flask blank at the same time on the electric stove, slowly boil. When the temperature is too high, easy soluble when boiling