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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
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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
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Suggest why CDCL3 is a more effective solvent than CCl4 for polar molecules.
CDCl3 is polar
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Give the formula of the peak that is used as a standard and produces a peak at &=0.
Si(CH3)4
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Suggest advantages of using a racemate rather than a single enantiomer in medicines.
Cheaper medicine due to cost or difficulty of separation;
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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
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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
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Card 2

Front

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

Back

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

Card 3

Front

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

Back

Preview of the front of card 3

Card 4

Front

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

Back

Preview of the front of card 4

Card 5

Front

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

Back

Preview of the front of card 5
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