题目
单项选择题
A student runs a TLC of a red pigment using a silica plate an ethyl acetate as the solvent. The red pigment was found to move 2.3 cm and the solvent front was measured to be 5.5 cm. What is the Rf of the red pigment?
选项
A.a. 0.42
B.b. 0.52
C.c. 0.55
D.d. 0.23
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标准答案
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思路分析
The question asks for the Rf value of the red pigment in a TLC run, where Rf is defined as the distance traveled by the compound divided by the distance traveled by the solvent front.
Option a: 0.42. If you compute 2.3 cm divided by 5.5 cm, you get 2.3 ÷ 5.5 ≈ 0......Login to view full explanation登录即可查看完整答案
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Question textAn example of Thin Layer Chromatography (TLC) results: Solvent used in developing a TLC plate: 50:50 hexane : ethyl acetate. Calculate the Retention factor (Rf) value for each component (ρ-aminobenzoic acid (PABA) and Benzocaine) on the plate. (to 2 significant figures) Please refer to p.47 in the lab manual for more information. [table] TLC results | Rf (retention factor) ρ-aminobenzoic acid (PABA):Distance travelled: 2.1 cm Benzocaine: Distance travelled: 3.5 cm Solvent front: Distance travelled: 4.1 cm | Rf (PABA)= Answer 1 Question 6 Rf (Benzocaine)= Answer 2 Question 6 [/table] Based on the information above, which compound is less polar? Multiple choice 1 Question 61. PABA2. Benzocaine3. NeitherMark 1.00 out of 1.00
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