Abstract
A new term, the masking coefficient, has been derived and introduced in analytical considerations involving masking of precipitation reactions. The masking coefficient is expressed by an equation : ▪ where the first term is related only to the properties of the precipitate, the second to masking of the cation, and the last to masking of the anion. If suitable diagrams have been prepared for calculating the “side reaction coefficients”-log α M and logα A -all calculations can be easily performed. The utility of the masking coefficient criterion to predict whether masking or precipitation occurs has been confirmed experimentally. Some examples of calculation of the masking coefficient for well known analytical reactions are given.
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