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问1:如果在配无水甘油酒精时,加的酚酞、NaOH都多,甘油酒精出现深红色,放置时间长红色也不消失,怎样消除红色?深红色变为浅红色后能否影响fCaO的测定呢? 答:配制无水甘油酒精时加的酚酞、NaOH多了,甘油酒精溶液出现的深红色,虽经长时间放置,红色也不消失。说明加的NaOH确实多了,在这种情况下,可用0.1N苯甲酸无水酒精溶液中和至红色消失。再用0.01NNaOH无水酒精溶液中和呈微红色。甘油酒精溶液由深红色变成浅红色后不影响fCaO的测定,因由深红色变成红色的过程表示甘油酒精溶液的pH值逐渐减弱而已。问2:回收甘油无水酒精后,怎样处理方能测定fCaO? 答:按其所问,是指已经回收的甘油酒精溶溶,不知甘油是如何回收的。目前,一般不回收甘油
Question 1: If there is phenolphthalein and NaOH added in the case of anhydrous glycerin alcohol, the alcoholic alcohol will appear dark red and the red color will not disappear for a long time. How to eliminate red? Determination of it? A: The preparation of anhydrous glycerol plus phenolphthalein, NaOH more, glycerol alcohol solution appears dark red, although the long time to place, the red does not disappear. Description added NaOH is indeed more, in this case, can be neutralized with 0.1N benzoic acid anhydrous alcohol solution to red disappear. Then 0.01N NaOH anhydrous ethanol solution and was reddish. Glycerol alcohol solution from dark red to light red after the determination of fCaO does not affect, as the process from dark red to red indicates that the pH of glycerol alcohol solution gradually weakened only. Question 2: How to determine fCaO after recovering glycerol anhydrous alcohol? A: According to its question, it refers to the glycerol alcohol that has been recovered, and it is unknown how glycerol is recovered. Currently, glycerin is not normally recovered