Strong ionic binding Structural

Figure 9.3 shows the relationship between ionic radius and proton affinity in a graphical way for monatomic ions having a — 1 charge. It is clear that to a good approximation there is a correlation between the size of the anion and its proton affinity. While this is in no way a detailed study, it is clear that the smaller (and thus harder] the negative ion (with the same type of structure) the more strongly it binds a proton. 

Several methods revealed that PECs between strong polyelectrolytes have a 1 1 end point stoichiometry and also a 1 1 stoichiometry of ionic binding under full release of the low molecular counterions at nonstoichiometric mixing ratios. However, it remains an open question whether the major component in such systems is bound in excess in the PEC structures, giving them a net excess charge. To solve this problem, viscometry, analytical or preparative ultracentrifugation, and fractionation techniques in combination with analyzing methods can be employed. 

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