求翻译：To do the reaction, a 1000 ml round bottom flask is filled with 150 grams of ephedrine hydrochloride (or PPA-HCl). The use of the sulfate salt is unacceptable because HI reduces the sulfate ion, so this interferes with the reaction. Also added to the flask are 40 grams of red phosphorus and 340 ml of 47% hydroiodic acid. This same acid and red phosphorus mixture can be prepared from adding 150 grams of iodine crystals to 150 grams of red phosphorus in 300 ml of water. This should produce the strong hydroiodic acid solution needed. Exactly how strong the acid needs to be, I can't say . I can tell you that experiments have shown that one molar HI is ineffective at reducing ephedrine to meth. The 47% acid mentioned above is a little over 3.5 molar. I would think that so long as one is over 3 molar acid, the reaction will work.是什么意思？

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