An example of a three-component mixture

Before discussing more complicated models and systems with more than three components, we present a mixture design problem with real data, performed in the laboratory of Professor G. Oliveira Neto (Chemistry Department, Campinas State University). 

Pure components 1 and 3 produce average signals of 3.10 and 0.35 cm, respectively. For a 1 1 mixture of these two components, the average 

Study of a membrane for making a selective electrode. Mixture compositions and observed analytical signals are presented 

The analytical signal is the peak height, in centimeters. 

Substituting the average response value observed for each mixture in Eqs. (7.15a-c), we arrive at the following values for the coefficients of the quadratic model  

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