The reason for this lab was to find the equilibrium constant for the formation of a
complex ion using a spectrophotometer. Then, graphing techniques will be used to evaluate the
data. This would help in finding the equilibrium constant for a soluble equilibrium. There were
three parts to this experiment. The first part was to set up a calibration curve from a set of
standard solutions. The second part was to discover the absorbance of the test solutions. The last
part was to calculate the K
. The techniques used were cleaning the glassware, preparing
solutions, properly discarding chemical waste, reading and recording, and lastly using a pipet. A
spectrophotometric is a measuring instrument that measures transmitted light intensities of a
source in different visible wavelengths.
Some possible errors were not properly cleaned
glassware, fingerprints outside the cuvette, inaccurate measurements, spectrophotometer not
working, and inaccurate readings. The results were average equilibrium constant, the standard
deviation, and the percent relative standard deviation.
The goal for this lab is determining the equilibrium constant for the formation of a