Colorimetry

Question 1

EQ : suggest why it is important that the container for each sample has the same dimensions in a colorimeter (1)

Answer 1

Absorption depends on distance travelled through solution

Question 2

EQ : suggest why the coloured filter is used (1)

Answer 2

• to select the colour / frequency / wavelength that is absorbed by sample

Question 3

EQ : suggest one reason why a colorimetric method might be chosen in preference to titration (1)

Answer 3

• quicker to analyse extracted sample than by titration
• Uses smaller volumes of solution