Question

a student performs an experiment to study the turbidity of water from a nearby pond. the turbidity of the water is measured using a mass spectrophotometer. the student repeats the experiment three times using the same sample of water. the readings are provided in the table.

	wavelength (in nm)	absorbance (in %)
reading 2	450	0.223
reading 3	450	1.340

what might have caused the inconsistent results?
use of an uncalibrated mass spectrophotometer
repeated use of the same wavelength of light
using the same sample of water
use of a spectrophotometer to measure the readings

Explanation:

An uncalibrated spectrophotometer can give inconsistent readings. Using the same wavelength and sample are normal experimental procedures and using a spectrophotometer is appropriate for absorbance - related measurements.

Answer:

use of an uncalibrated mass spectrophotometer