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Apparatus and techniques a re dc~crib ed for t h e t itration of acids a nd. bases by co nstantcurrent coulometry. The precision nnd accuraey of t he method aI~e JndLcated by tl traL lons of benzoic acid, potass ium acid pMhalate, adL piC aCld, hy droc~lo l'l c aCid, ~nd sod ium eal'-bon ate. Standard deviations of ± 0 .003 p er cent h ave been obtaIn ed which LndlCatp. that the reli abili ty of th e method is eq ua l to or exceeds t h at of class Ica l analytlcfLI proced ures.