colorimetry

Question 1

two things you need to do before using a colorimeter

Answer 1

• zero with water
• choose a filter of complementary colour (highest abs)

Question 2

method to find the concentration of a solution

Answer 2

• make 5 solns of known concentration (near the predicted unknown value, above and below)
• measure abs
• plot a calibration curve (abs/conc)
• measure abs of unkown
• use graph to find conc

Question 3

how can you use a colorimeter to find the formula of a complex?

Answer 3

• mix TM ion with different ratios of the 2 ligands and measure abs
• plot abs/conc graph (2 rows on the x axis, one for each ligand)
• draw 2 lines of best fit
• where lines intersect, connect to x axis