Spectral and chemical data are presented which show that bromine and bromate ion in acid solution are unstable with respect to, formation of hypobromous acid. At higher concentrations of hypobrornous acid, the reactiorl is reversed, and this species decomposes relatively rapidly to bromine and bronlate. Some aspects of the kinetics of these reactions are described, from which dedwtions are made regarding possible mechanisms of the two processes.
Radiotracer studies ivith BrS' show that bromine and bromate ion i l l perchloric acid solution 1111dergo isotopic eschange a t a measurable rate. 'The ki~leticli of the process suggest that secouclary chen~ical reactions occur, leading LC) thc iormation of signihcant co~~ccntrations of hypohrornous acid i l l the systc~n. The isotopic exchange betiveen h > , p o b r o n~o~~s acid and bromine is complete ivithin the ti~iie required to separate these slx.c:ics.
A method is described for the precise meas~~relnelit of the activity coefficients of salts in mixed electrolytic solutions. I t involves the use of synthetic ion exchange resins and radioactive tracers. The activity coefficients of the chlorides of sodium, potassium, rubidium, and cesium were measured a t effectively zero concentration in hydrochloric acid solutions from 0.005 to 1.5 m. The activity coefficient of sodium chloride in solutions of lithium and potassium chlorides was also determined. The results are discussed in terms of both the Harned rule and the Stolies-Robinson theory of activity coefficients.
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