A student wishes to obtain a calibration curve of absorbance versus concentration for…
CHEMISTRY · Single correct · AP · Chemistry · Properties of Substances and Mixtures · Properties of Substances and Mixtures
Problem
A student wishes to obtain a calibration curve of absorbance versus concentration for a compound whose molar absorptivity is known to be constant at the measurement wavelength. Which of the following changes is most likely to increase the slope of the calibration line without altering the true value of molar absorptivity?
(a) Increase the electronic gain setting of the photodetector.
(b) Replace the 1.00cm cuvette with a 2.00cm cuvette.
(c) Measure absorbance at a wavelength 50 nm away from λmax.
(d) Prepare solutions over a concentration range that is one-half of the original range.