Standard Methods of Chemical Analysis: a Manual of Analytical Methods And ...
Standard Methods of Chemical Analysis: a Manual of Analytical Methods And ...
Wilfred W Wilfred Welday Scott
The book Standard Methods of Chemical Analysis: a Manual of Analytical Methods And ... was written by author Wilfred W Wilfred Welday Scott Here you can read free online of Standard Methods of Chemical Analysis: a Manual of Analytical Methods And ... book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Standard Methods of Chemical Analysis: a Manual of Analytical Methods And ... a good or bad book?
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IRON Hydrogen Sulphide Method. Weigh 10 grams of sample which has had any metallic iron particles or iron containing dust removed with a magnet. Place in a 250-cc. beaker, and dissolve with 50 cc. concentrated hydrochloric add. Let stand several minutes until violent action has ceased, then add about 1 cc. potassium chlorate solution (50 grams per liter), and boil until the chlorate is all decomposed. Cool, add 50 cc. of water and neutralize the solution with ammonia, adding a large excess, boi...l for two or three minutes, allow the precipitate to settle, filter and wash with hot dilute ammonia water and finaUy with hot water. Dissolve the precipitated hydroxide of iron into a 16-ounce Erlenme^^er flask, using 10 cc. dilute sulphuric acid (1 : 4). Wash the paper thoroughly with hot water, dilute to a volume of about 300 cc. and reduce the iron by passing hydrogen sulphide through the solution for five minutes, boil to expel excess of hydrogen sulphide, being careful to exclude the air by means of a Bunsen valve.
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