Chem lab exam
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40 Terms
Actual over theoretical
Percent yield is what over what?
Phenols
What does FeCl3 test for?
Purple
What color does tube turn when reacts with phenol?
2 degrees
What is pure organic compounds melting range?
Lower and widen
What two things do impurities do to melting range?
Chemical for each lane
What proved the TLC plate to be pure samples?
CCl4
Is CCl4 or water more dense
Carbon and hydrogen
Non polar bonds?
Polar bonds larger than 3 carbons
What compounds are soluble in non-polar substances like water?
Polar bonds and 3 carbons or less
What compounds are soluble in polar solvents?
Deprotonate (negative)
In acid/base what does removal of hydrogen do?
Yes but they separate from polarity automatically
With chlorophyll and beta carotene would they separate with acid and base?
Polar
What type of compounds move slowly through the column?
Non-polar
What type of columns move fast through the column?
Steals binding sites fast polar still comes out last
What happens with 70:30 hexane solution?
Polar still comes out last
What happens with 90:10 hexane solution?
Polar
Smallest ref value ?
Less polar, slow so smaller ref values because of less travel
70:30 to 80:20 tlc plate
3200-3650
O-H bond
3100-3500
N-H bond
2850-3000
Sp3
3000-3100
Sp2
2100-2250
Carbon carbon triple bond
2240-2260
Carbon nitrogen triple bond
1670-1780 unique
Carbons doubled oxygen
1640-1680
Carbon carbon alkene
1600 and 1500-1475
Carbon carbon benzene
Sharp narrow melting range
How does melting point asses purity ?
R-CH3
What is acety
Carbonyl and nucleotide groups
How to transfer an acyl group ?
Dry to solid
Why vacuum?
Assess purity
What does FeCl3 do?
Acetylsalicytic acid
What is the filtrate in aspirin lab?
Distance of travel/distance of solvent
RF value calculation?
uV light
How to see organic compounds on plate?
Less polar substance
What compound travels farthest tlc plate?
More polar substances
What leads to faster elation?
Solvent bond shows through that wasn’t only only glove IR
What shows impurity in gloves?
Sink
Acid base and aqueous solution disposal
Mass in g measured/molar mass x moles
How to find LR?
Note 
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