Abstract
Difficulties in the precipitation of Group II of the classical scheme of qualitative inorganic analysis are discussed. Three reagents for the destruction of permanganate and dichromate have been examined; hydrogen peroxide was found to be most suitable. Conditions have been established whereby As 2S 5 can be precipitated, thus avoiding the necessity for reducing As V before passing hydrogen sulphide. A simple separation of the Group IIB elements, based on the stepwise precipitation of their sulphides from solutions of controlled acidity, is proposed. These modifications have been adapted to the procedures of Holness 2 and Holness and Trewick 1, for adjusting the acidity and for dividing the sulphide precipitates into the two sub-groups.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
