What is the colour of the compound "A"`with the UV absorption spectrum shown on the right? Explain.
What wavelength should be selected when determining the concentration of compound "A" in a sample of waste water? Explain why
A 0.100 g sample of water is to be analysed to determine the concentration of a particular metal ion. The absorbance of five different standard solutions was measured and the calibration curve plotted, as shown on the right. The absorbance of the sample was then measured at 0.25.
Why should the chemists conducting the test select the wavelength, at which absorbance measurements are taken, carefully?
What is the concentration for the known ion in the sample?
What is the percentage by mass
of the ion in the sample? Assume 1 litre of solution weighs 1 kilogram.
