Abstract Determination of the formula and stability constant of a complex by the continuous variation method is a standard experiment for chemistry students in universities. But when the metal to ligand complexation formation is 1:2 or 1:3, the experiment designs in all the experiment textbooks may have the same flaw, which is too few sampling points, or too few solutions being prepared. If the solutions were prepared according to these textbooks, there would be no solution with the metal to ligand ratio which corresponds to the stoichiometry of the complex. With all the points showing good linearity, there would not be enough data to estimate the curve so as to calculate the stability constant. This paper discussed the reason, consequences and solutions of this flaw in this kind of experiment design.
WANG Rong, WANG Qing. Possible Flaw in Experiment Design on Continuous VariationMethod for Determining the Stability Constant of a Complex[J]. Chinese Journal of Chemical Education, 2018, 39(16): 75-77.
