Instrumental methods

Question 1

instrumental methods

Answer 1

use machines to detect and analyse substances

Question 2

advantages of instrumental methods

Answer 2

offer improved:

• sensitivity, can detect very small amount of different substances
• accuracy, measure amounts very precisely
• speed of tests, carry out each analysis quickly, can run all the time

Question 3

flame photometry

Answer 3

-instrumental method of analysis based on flame tests

• measures the light intensity of the flame colours produced by metal ions
• separates the flame colours to produce an emission spectra

Question 4

What can the data from a flame photometer do?

Answer 4

• identify the metal ions present in the sample
• compares the spectrum with a reference spectrum from a known substance

-determine the concentration of ions in a solution using a calibration curve

Question 5

disadvantages of a flame photometer

Answer 5

• more expensive

- can only be done where there is a machine