ow figure is a thin layer chromatography (TLC) analysis of a reaction that a stu
ID: 104692 • Letter: O
Question
ow figure is a thin layer chromatography (TLC) analysis of a reaction that a student just performed·Rz where the pure starting material (initial reactant) was spotted before any reaction occurred. P = where the reaction mixture was spotted after the reaction had been allowed to react for about 20 minutes. . end line (4.0 cm) 2.5 cm 2.0 cm Start line (0 cm) a) Is the reactant consumed? (1 pt) Circle: YES NO b) What is the most polar, the reactant or the product? (1 pt) Circle: Reactant c) What is the Rf value of the product? (1 pt) Circle: 0.5 0.25 1.5 0.625 d) Using a more polar elution solvent would make only the reactant spot move farther. (1 pt) Product Circle: True Fals e) Using a less polar elution solvent would make only the reactant spot move farther. (1 ptj ircle: True FalseExplanation / Answer
Rf = distance moved by the compound or spot / distance moved by the solvent.
The more polar a compound has the lower Rf value. Because Polar compound want to bond with polar silica, while non-polar compound will move fast with eleuent hence this non-polar has highest Rf value.
The factors that influence the Rf of a compound on silica get TLC are following:
a)
Yes the reactant consumed because there is no spot at reactant distance.
b) reactant,R
The more polar a compound has the lower Rf value. Because Polar compound want to bond with polar silica, while non-polar compound will move fast with eleuent hence this non-polar has highest Rf value.
c) R f of product = distance moved by the compound or spot / distance moved by the solvent.
= 2.5 cm /4 cm
= 0.625
d) true
f) false
because reactant is more polar
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