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编辑同志: (一)化学通报54年7月号,卢维真同志所写的“侯氏法中的B母液和C母液的循环关系”一文中,第四段说:“省先,将5克的氯化铵溶解在20毫升的水中,所成氯化铵水溶液的浓度,大约等於25％。实际所成氯化铵的水溶液应约为25克。所以,这时氯化铵水溶液的浓度应约为5克/25克=1/5即20％。卢同志所说约为25％,显然是错误的。 (二)同期所载,“高中化学——‘溶解时的吸热放热现象’的教学”一文,第335页第八项“板书计划”一栏内:“(1)物质溶解时有两种反应:①溶
Editor comrades: (a) of Chemistry Bulletin July 54, Comrade Lu Weizhen wrote “Hou’s law in the mother liquor and B liquid C cycle relationship,” a fourth paragraph said: “The province first, the 5 grams of Ammonium chloride is dissolved in 20 ml of water and the concentration of aqueous ammonium chloride solution is approximately equal to 25%. The actual aqueous ammonium chloride solution should be about 25 g, so the concentration of ammonium chloride aqueous solution should be about 5 grams / 25 grams = 1/5 or 20% .Lu commented that about 25%, obviously wrong. (B) contained in the same period, ”high school chemistry - ’endothermic exothermic dissolution phenomenon’ Teaching, “a text, p. 335, eighth” plank “plan column:” (1) there are two kinds of material dissolution reaction: ① dissolved