The Dissociation of Water in Potassium and Sodium Bromide

T H E DISSOC'I-ATIOS OF KAATERI S POTASSIUM - 4 S D S O D I U l I BROMIDE SOLTTIOSS*

I n the preserot investigation, the method iisetl liy Harned, Harnetl and Sn-intlells: antl Alierlof' for the tleterinination of the activity coefficient of nxter as an electrolyte and therefrom its dissociation in neutral aqueous potassium. sotliiini, lithiiini chloride antl suIphate solutions has been used for determining these same qiiantities in aqueous potassium and sodium bromide solutions. The (lata necessary for the evaliiations of these quantities include measurements of the cells : H? ' HBr!ni,7I. 3IBr(mi AAlpRr1 -Alp. H, ' 3IOHini,I. 31Brinii 31,Hg ~3IOH(ni,'i H!. and -Ag AgBr 1 3IBrlm+nl,i ' 31,Hg ' 3 1 B r ~ m 0 ~ i XgBr i I Ag. In this stii(!y, meesiirements of tl:c first of these cells containing 0.0131 ant1 0.I Si hylrohromic ncitl in potnssiiini ant1 sodium lironiide solutions antl measiirenients of the .Gecontl of the a h \ - e cells containing c. I 31 potassium hy,lrositle in pot::asiiim lnmniile solutions have heen made. The necessary t h t a on cells containing sotliiiiii hytlrosit!.e in sodium bromide solution5 as IT-ell 2.s the dat:? for the third t:-l;e of cells containing sodium bromide have heen ohininetl from the !-et unpu1)lislietl work of 31r. Stuart' D. Doiiglas. The tlatn of the thirtl tyI:e of cells containing potassium bromide were ohtainetl from the nmisiireiiients of Pearce nntl Hart .? supplemented hy some -mhes for the concentratetl solutions o1)taiiietl Iiy 3Ir. Douglas.3 ~

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Materials

Potmsiuiii nn?algini containing o . 0 1 ~ ; pjtnssiiuii was made liy the method tlescrihetl liy 31acInnes and Parker, I