Chemical Analysis And Instrumental Methods

Question 1

What are the stages of paper chromatography?

Answer 1

• put spots of the ink on a baseline on filter paper
• roll the sheet and place it in a beaker with a small amount of solvent
• the solvent seeps up the paper, taking the ink with it
• the dyes stop in different places

Question 2

What are the advantages of using instrumental methods?

Answer 2

• very sensitive so can detect smaller amounts
• faster
• more accurate

Question 3

What are the stages of gas chromatography?

Answer 3

• a gas is used to carry the substance through a column
• the substances travel at different speeds so they separate
• the time they take is called the retention time and is used to identify the substance
• the recorder draws a gas chromatograph (the number of peaks is the number of substances)
• a mass spectrometer can be added to identify the substances accurately

Question 4

What are the two methods of identifying substances?

Answer 4

Paper chromatography and gas chromatography