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In the Kjeldahl method, what is the purpose of the digestion step using concentrated sulfuric acid?

To release ammonia gas

To oxidize nitrogen

To neutralize the sample

To measure pH

Buchi offers Rotavapor R-300 Evaporation Flask in 2 sizes:

5L and 2L

5L and 1L

5L and 3L

3L and 1L

If we increase the vacuum, will it have an effect on boiling temperatures?

Yes

Buchi Sepiatec SFC Chromatography Systems offer detection using:

ELSD

All of the above

Flash chromatography is often used in which field of science?

Cytology

Geology

Pharmacology

Food and Feed

Buchi offer Kjeldahl Digesters with the following number of samples:

6 and 9

9 and 12

6 and 12

6 and 18

Which of the following statements about preparative separations by SFC chromatography is true?

SFC is primarily used for gas-phase separations

SFC employs supercritical fluids as the mobile phase

SFC uses liquid solvents exclusively

SFC is less efficient than HPLC for preparative separations

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