Hydroxyethylcellulose - HYDROXYETHYLCELLULOSE...

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Unformatted text preview: HYDROXYETHYLCELLULOSE Hydroxyethylcellulosum Hydroxyethylcellulose l cellulose c O-(2-hydroxyethyl) ha m t ph n. Tnh ch t H t hay b t tr ng, tr ng ng hay tr ng xm. Tan trong n c nng v n c l nh t o dung d ch keo, th c t khng tan trong aceton, ethanol 96% v toluen. nh tnh Dung d ch S: Phn tn m t l ng ch ph m t ng ng 1,0g ch ph m lm kh trong 50 ml n c khng c cacbon dioxyd (TT). Sau 10 pht, pha long n 100 ml v i n c khng c cacbon dioxyd (TT) v khu y cho n khi tan hon ton. A. un 10ml dung d ch S n si, dung d ch v n ph i trong. B. L y 10 ml dung d ch S, thm 0,3 ml dung d ch acid acetic long ( TT) v 2,5 ml dung d ch acid tannic 10% . Xu t hi n t a bng, mu tr ng ng, t a ny tan trong dung d ch amoniac long (TT) . C. Trong ng nghi m c chi u di kho ng 160 mm, tr n u 1 g ch ph m v i 2 g b t m n mangan sulfat (TT) . t m u gi y l c c t m h n h p m i pha g m 1 th tch dung d ch diethanolamin 20% (TT) v 11 th tch dung d ch natri nitroprusiat 5% (TT) . v c i u ch nh pH n khong 9,8 b ng dung d ch acid hydrocloric 1 M (TT) vo ph n trn c a ng nghi m su kho ng 2 cm, un cch d u silicon ng nghi m sao cho ph n ng p trong d u kho ng 8 cm nhi t 190 200 o C. Gi y l c c mu xanh d ng trong vng 10 pht. Ti n hnh song song m u tr ng trong cng i u ki n. D. Ha tan han tan 0,2 g ch ph m, khng un nng, trong 15 ml dung d ch acid sulfuric 70%. V a dung d ch vo 100 ml n c v a khu y u, pha long n 250 ml v i n c . L y 1 ml dung d ch trn cho vo ng nghi m lm l nh ng nghi m trong n c , thm b ng cch nh gi t 8 ml acid sulfuric (TT). . un trong cch th y chnh xc trong 3 pht, sau lm l nh trong n c ngay l p t c. Khi h n h p l nh, thm c n th n 0,6 ml dung d ch ninhydrin (TT 2 ) , tr n u. yn 25 o C. Mu h ng xu t hi n ngay l p t c v khng chuy n thnh mu tm trong vng 100 pht. trong v mu s c dung d ch Dung d ch S khng c h n h n d ch i chi u III (Ph l c 9.2) v khng m mu h n mu m u (Ph l c 9.3, ph ng php 2) ....
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Hydroxyethylcellulose - HYDROXYETHYLCELLULOSE...

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