The stabili ty of mill t s ih:er, purified mint silver, and Pyrex fr itted crucibles in aq ueou s solutIO ns of p erchlonc aC I~, In aq ueo us solutions of p erchloric a cid containing silver perchlorate, and 111 cond uctIvI ty water at room t emperature was determined . The stabili t y of the silver in vario us s tates of subdivision was st udied . The corrosion cu rrent-density for mint sil ver i n sheet form is 1.1 X lO-8 amp cnr2 for 20 percent aq ueous solution s of perchloric ncid , 1.3 X 10-9 a mp cm-2 for 20 p ercen t nqueo us solu tions of perchloric acid contallll ng 0.5 p ercent s il ver perchl orate, and withi n the limits of detection is zero for conductivity water. . Pyrex has high stabi li ty at 25 C i n 20 percent aq ueou s sol utions of perchlo nc aCId and In 20 pe rce nt aqu eous solutions of p erchloric acid conta ining 0.5 percen t silv er p crchlorate. Finely-d ivided silver contained in Pyrex crucibles was found to be highly stable whe n the crucibles were filled repeatedly with aqu eou s solutions of perchloric acid containing silver perchlorate, rinsed with conductivity water, and dried a t 105 C. These observations are importa nt in the determination of th e farad ay by the a nodic disso lu tion of silv er in aq ueou s solu tions of perchlor ic a cid which is now underway a t th e K ational Bureau of Standards.
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Craig et al. (1960) studied this question.