=(5.31 ± 0.15) X 101 23 and ß3 = (4.27 ± 0.18) X 10" where the errors are the standard errors of the mean.In an identical manner the calculations were made assuming the 1:1 and 1:2 hafnium:chloranilic acid complexes, obtaining as a result the value ß2 = 2.2 X 107 used in the following comparison calculation.Linear Regression Analysis. Equation 16written in the form Cm X [1 + 0,(L) + ß (L)n] = a,(L) + an(L)n ( 26) where = 2 or 3, is seen to be linear in the coefficients if the ß constants are known. At each one of the 21 wavelengths studied here, 12 equations were set up in the form of Equation 26and by a series of weighted least squares linear regression calculations using the program outlined in Reference (13), it was possible to determine which model best fit the experimental data, the model assuming one and three chloranilate ligands per hafnium ion or the model assuming one and two ligands.
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