Amphoteric Behavior of Complex
نویسنده
چکیده
The hypothesis that a mixture of two ampholytes behaves, within certain limits, as an individual (1) with characteristics distinct from either component can also be semiquantitatively tested by certain conductivity experiments. These are based on the observation that the addition of such a substance as gelatin markedly decreases the observed conductivity of a phosphate solution. The magnitude of the decrease is a function of the pH and passes through a minimum at the isoelectric point of the gelatin. In other words, the specific contribution of the gelatin to the measured conductivity is negative. Consider the case of two such ampholytes, A and B. Their separate effects on the conductivities of buffer solutions will be as above, and will be a minimum at their respective isoelectric points. When mixtures of the two are observed, however, their effect is altered due to the fact that through a certain pH range, namely between their respective isoelectric points, there will also be a tendency for mutual "binding" of A and B with a resulting "release" of buffer, resulting in a measured conductivity greater than would be calculated from a knowledge of their behavior when observed separately. This difference between the observed and calculated value of the conductivity may be expected to pass through a maximum at or near what has been termed the isoelectric point of the system. In case the substances A and B have themselves conductivities comparable with those of the buffer, there is another possibility, which is much more probable, but which cannot be certainly predicted.
منابع مشابه
Amphoteric Behavior of Complex Systems
The amphoteric behavior of a system of two amphoteric components is theoretically examined; and this is shown to correspond more nearly with certain of the physical and chemical behaviors of living tissues than does the concept of a simple ampholyte.
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