Division

Note: It is necessary that the combined volume of water and sodium hydroxide solution total 370 ml to enable approximately 150 ml of distillate to be collected just before irregular boiling (‘bumping’) ensues (6.4.). Thus, if a larger equivalent volume of a sodium hydroxide solution which is less concentrated than 47 % (m/m) is added, the volume of water added shall be reduced accordingly. For example, if 85 ml of 40 % (m/m) or 125 ml of 30% (m/m) sodium hydroxide solution are to be added, the volume of water added shall be 285 ml or 245 ml respectively.