I\'m not sure if someone can answer this because it\'s from a lab experiment Bas
ID: 893263 • Letter: I
Question
I'm not sure if someone can answer this because it's from a lab experiment
Based upon the observations of the second TLC plate, which reactant was in excess, and which was the limiting regent?
A- Napthalene was in excess, 2-Br-2-methylpropane was limiting
B- Napthalene was limiting, 2-Br-2-methylpropane was in excess
C- The two reactants were in schichiometric ratio; neither was in excess
D- The two reactants were both in excess, neither was the limiting regent
Part 2- Did you confirm the above answer from the number and location of spots present? Yes or No.
Some more info from the lab step that this question involves.
I had to take a TLC plate and put it under the lamp, and the TLC image appeared on the monitor. The TLC spots were present in each of the 4 vertical channels. The first three channels, from left to right corresponded to napthalene, 2-bromo-2-methylpropane, and t-butylnapthalene. Unfortunately that's really all the info that I have to give.
Explanation / Answer
To answer this question, one should check if the spot of naphthalene is brighter than the spot of 2-bromo-2-methylpropane in the TLC plate. If it is so, the naphthalene is in excess and 2-bromo-2-methylpropane is the limiting reagent. If the reverse is true, i.e, the the spot of naphthalene is lighter than the spot of 2-bromo-2-methylpropane in the TLC plate. If it is so, the naphthalene is limiting and 2-bromo-2-methylpropane is the excess reagent. If two spots have equal intensity, then they are in stoichiometric amounts.
For this, I need the image of TLC.
For the second question, the location of the spots corresponds to the identity of compound i.e naphthalene or 2-bromo-2-methyl propane and the number of spots corresponds to number of species present which cannot be used to confirm the answer.