unit 3: colorimetry

Question 1

colorimetry uses the relationship between

Answer 1

the colour intensity of a solution and the concentration of the coloured species present

Question 2

the higher the intensity

Answer 2

the higher the concentration

Question 3

a colorimeter (spectrophotometer) is used to

Answer 3

measure the absorbance of light of a series of standard solutions at a specific wavelength

Question 4

a filter is used in the colorimeter which ensures

Answer 4

only light of the chosen wavelength passes into the samples

Question 5

colour of the filter

Answer 5

should be the complementary colour of the solution being analysed

Question 6

calibration curve

Answer 6

the graph of absorbance vs concentration

Question 7

the graph should form a

Answer 7

straight line

Question 8

if the measured absorbance lies out with the calibration curve

Answer 8

the sample must be diluted until it falls within range

Question 9

dilution calculation

Answer 9

c1v1=c2v2

Question 10

dilution calculation is used to

Answer 10

calculate the concentration of standard solutions made by dilution

Question 11

what should be tested in between concentrations

Answer 11

distilled water