After appearance fluid joins distillation unit, answer to use seal of a place of strategic importance of strong record glass first, add watertight to seal, prevent flat. Next rejoin lye, this order cannot make a mistake, can cause otherwise determine result on the low side. Should notice lye wants at the same time slow join, cannot too fast.
The solution of titrate of hydrochloric acid standard that titration uses must accurate, before using, answer solvent bottle fluctuating a few, make sure solution chroma agrees equably. The attention when titration discharges the bleb of empty burette bottom, ensure titration result is accurate. (Author: Tan Xu is believed; Lan Zunhai; Li Mei orchid)
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