this spectroscopy question seems very basic but i cant get it which is making me go crazy
i would appreciate anyones help
this is the question
The phosphate content of a detergent may be analysed by UV–visible spectroscopy. In one analysis, a 0.250 g sample of detergent powder was dissolved in water and the solution made up to 250 mL. The solution was treated with a small volume of sodium molybdate solution to form a blue-coloured phosphorus compound. The absorbance of the solution at a wavelength of 600 nm was measured as 0.17.
The absorbances of five standard phosphate solutions were measured in a similar fashion and the calibration graph shown was obtained.
a What is the concentration of phosphorus in the 250 mL detergent solution?
b Determine the percentage by mass of phosphorus in the detergent powder.
c Why was a wavelength of 600 nm selected for this analysis?
heinemann chemistry 2 chapter 7 q12 page 88
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