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Regarding organic chem lab questions

1. Why is the stemless funnel Used instead of the longstem funnel To

filter Hot solutions Through fluted Filter paper? After recrystallization,Why is the final product Be isolated by Vacuum Filtration But not by Gravity filtration?

2.One student Re-crystallized 3 g of impure napthalene Which was 90% purity,However only 0.4Grams of the pure product was Obtained.From the 10 Choices Given below,Choose five reasons Which could Lead to The low yield.

a)That heating time was too long When dissolving the impure napthalene In methanol

b)The heating temperature was too lowWhen dissolving the impure napthalene in methanol

c)When doing The gravity filtration,The longstem funnel is used

d)When doing the gravity filtration, The filter paper is fluted

e)Some solution was left in the flask after decanting

f)The calcium chloride Was not added enough when drying the solution

g)When doing The suction filtration,The solution was chilled

h)when doing the suction filtration,The filter paper was fluted

i)When doing the section filtration,The vacuum was not good

j)Mind giving the suction filtration,Methanol is used to wash

3.One student distilled A mixture Of methanol And 1-butanol With simple distillation And collected the distallate in 3 vials But each distallate in Vials was not pure. Please list two methods To improve the separation effect and explain.

4.Please write the reaction For the synthesis of methyl orange From the starting material Of sulfanic acid and N,N-dimethylanaline.

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