Prelaboratory Questions And Problems

1. Look-up three applications of the concept of pzc and explain them in the light of the theory presented in the introduction.

2. In which cases is the point of zero proton charge, pzpc (or zero proton condition, zpc) different from the point of zero charge? Explain.

3. Predict the relative order of the pzc values of the metal oxides studied in this experiment on the basis of the ratio Z/R, where Z is the ionic charge of the cation and R = 2r0 + r+ (here, ro is the ionic radius of the oxide ion, and r+ is the ionic radius of the cation). The greater this ratio, the more acidic the oxide, and the lower the pzc.

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