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Created by: jatyization
Created on: 30-12-14 14:48

Explain why pH of an acidic buffer remains almost constant despite the addition of small amount of NaOH.

Added OH– removed by reaction with H+; HX H+ + X– moves to right; Ratio [HX]/[X-] remains almost constant

1 of 7

Outline briefly why chromatography is able to separate a mixture of compounds.

Eluent/solvent is mobile; Silica stationary phase; Separation depends on balance between solubility or affinity of compounds in each phase; Different adsorption or retention; Travel at different speeds or take different times: Different Rf values

2 of 7

Suggest why CDCL3 is a more effective solvent than CCl4 for polar molecules.

CDCl3 is polar

3 of 7

Give the formula of the peak that is used as a standard and produces a peak at &=0.

Si(CH3)4

4 of 7

Suggest advantages of using a racemate rather than a single enantiomer in medicines.

Cheaper medicine due to cost or difficulty of separation;

5 of 7

Suggest disadvantage of using a racemate rather than a single enantiomer in medicines.

May be side effects from one enantiomer in the mixture; Only half the product works as one enantiomer may be ineffective; Double dose required

6 of 7

Suggest how the rate of reaction of propanone with HCN would compare with the rate of reaction with propanal with HCN.

propanal faster; Inductive effects of alkyl groups

7 of 7

Other cards in this set

Card 2

Front

Outline briefly why chromatography is able to separate a mixture of compounds.

Back

Card 3

Front

Suggest why CDCL3 is a more effective solvent than CCl4 for polar molecules.

Back

Card 4

Front

Give the formula of the peak that is used as a standard and produces a peak at &=0.

Back

Card 5

Front

Suggest advantages of using a racemate rather than a single enantiomer in medicines.

Back

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