A Suggestion for Cleaning Glassware Coated with MnO2 ROBERT E. SCHAFFRATH, Department of Chemistry, C. W. Post College, Brookville, N Y., has a su~eestionfor others who m m have encountered difficultv in removine MnOlstains from vessels inuwhioh MnOl- oxidations were performed, stains whir& are generafy immune to soapand-brush treatment. Rather than take recourse to concentrated HCI, a method which is rapid but usually rather unpleasant as well ss somewhat hazardous, he recommends using sodium bisuliite, NaHSOs. I t is equally effective in destroying MnO. deposits and, as acidification is not necessary, there is no problem of the liberation of SOB. The bisulfite may he employed as s 2&30% solution or, alternatively, s. small quantity of solid bisulfite is added to the article to he cleaned, after which a few ml of water are added and the solotion distributed aver the stained areas.
578
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Journal of Chemical Education
