Instrumentation in organic chemistry

Question 1

What is chromatography?

Answer 1

Chromatography is a separation technique is which a moblie phase carries a mixture of components through a stationary phase
The componests in the mixtire are selectively adbsorbed onto the stationary phase and pass through at different times

Question 2

What is a mixture

Answer 2

substance consisting of two or more substances migled together but not chemically combined

Question 3

Name the thee types of chromotography

Answer 3

paper chromatography/
Gas chromatography/
High performance liquid chromotography (HPLC)

Question 4

Describe the procedure

Paper chromatography

Answer 4

Using a dropper, place a drop of ink or indicator 2cm up from the bottom of the chromotography paper on a pencil line drawn.
Place the chromatography paper into a beaker with 1cm of suitable eluent
leave for 1 hour

Question 5

Describe the result

Paper chromatography

Answer 5

As the eluent moblie phase moves up the chromotography paper, each component colour in the ink is selectively adsorbed and appears in the chromotography paper stationary at differnt times

Question 6

what is the mobile phase and the stationary phase

Paper chromatography

Answer 6

Moblie phase : liquid eluent/ solvent
Stationary phase: chromatography paper

Question 7

Name a suitable solvent for a soluable mixture and an insoluble solvent

Paper chromatography

Answer 7

Water
(Insoluble - methanol)

Question 8

Why is the line drawn on to the chromotograpy in pencil

Paper chromatography

Answer 8

avoids contamination with other types of ink

Question 9

Where should the pancil line be drawn on the chromotography paper

Paper chromatography

Answer 9

2cm up the chromotopraphy paper