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[单选题]
称取蔗糖试样5.000g,用水溶解后,稀释为50.00mL,20℃时,用2dm旋光管,黄色钠光测得旋光度为+12.0°,蔗糖的纯度为()
A.93.1%
B.95.2%
C.90.2%
D.92.5%
提问人:网友lixin080108
发布时间:2022-02-11
A.93.1%
B.95.2%
C.90.2%
D.92.5%
A. 93.1%
B. B.95.2%
C. C.90.2%
D. D.92.5%
A.+82.0°
B.52.0°
C.82.0°
D.+52.0°
称取葡萄糖10.00g,加水溶解并稀释至100ml,于20℃用2dm测定管测得溶液的旋光度为10.5°,其比旋度为
A、52.5°
B、-26.2°
C、-52.7°
D、+52.5°
E、+105°
A.52.5°
B.+105°
C.+52.5°
D.+26.5°
A.52.5°
B.一26.2°
C.一52.7°
D.+52.5°
E.+105°
A、53.0°
B、-53.0°
C、0.53°
D、+106°
E、+53.0°
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