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OverviewGeneral Books publication date: 2009 Original publication date: 1902 Original Publisher: D. C. Heath Subjects: Chemistry, Analytic Science / Chemistry / General Science / Chemistry / Analytic Notes: This is a black and white OCR reprint of the original. It has no illustrations and there may be typos or missing text. When you buy the General Books edition of this book you get free trial access to Million-Books.com where you can select from more than a million books for free. Excerpt: GROUP II. ARSENIC, ANTIMONY, TIN, MERCURY(Ie, LEAD, BISMUTH, COPPER, AND CADMIUM. General Remarks. -- The second group of metals includes those which form soluble chlorides, but which are precipitated as sulphides in dilute acid solution by hydrogen sulphide. Lead is classed in this group because it is not completely precipitated in the first group by hydrochloric acid, but is precipitated by hydrogen sulphide. The use of hydrogen sulphide for the purpose of isolating the metals of the second group presupposes the previous acidulation of the solution with hydrochloric acid, even if no member of the first group be present in the mixture to be analyzed. Experiment 6. -- Arsenic. () To 5 cc. solution of sodium arsenite, Na3AsO3, add just sufficient hydrochloric acid, Hn, to react quickly with litmus. Is there any precipitate ? Heat until quite hot, and pass in hydrogen sulphide, H2S, until precipitation is complete. Filter. Wash the precipitate thoroughly with cold water and throw away the filtrate. (b) Pierce the filter with a glass rod and wash the precipitate into a small evaporating dish. (c) Add yellow ammonium sulphide, (NH4)2S. r, using no more than necessary, stirring for some time, and heating gently. The precipitate should dissolve. Note. -- (NH4)2Si may be prepared by gently warming in a test- tube a little (NH4)2S, ammonium sulphide, with a pinch of flowers of sulphur. Experiment 7. -- Antimony. Repeat Experiment 6, using solution of tartar emetic, KSbO(C4... Full Product DetailsAuthor: John Brewer GarvinPublisher: General Books Imprint: General Books Dimensions: Width: 22.90cm , Height: 0.70cm , Length: 15.20cm Weight: 0.177kg ISBN: 9781150534379ISBN 10: 1150534370 Pages: 114 Publication Date: 20 December 2009 Audience: General/trade , General Format: Paperback Publisher's Status: Active Availability: In Print  This item will be ordered in for you from one of our suppliers. Upon receipt, we will promptly dispatch it out to you. For in store availability, please contact us. Table of ContentsReviewsAuthor InformationTab Content 6Author Website:Countries AvailableAll regions |
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