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Exercises in Practical Chemistry

Exercises in Practical Chemistry


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About the Book

Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: SECTION II. PREPARATION AND EXAMINATION OF GASES. EXERCISE 1. Oxygen. Apparatus required?Pneumatic trough; argand burner, and fish-tail burner, or spirit lamp; retort-stand; sand-bath; piece of wire-gauze; corks; cork-borers; rat-tail file; three-square file; Florence flask; glass tubing, about 6 or 7 mm. in external diameter; porcelain mortar; two small porcelain dishes; scales and weights; sheets of writing-paper; deflagrating jar; deflagrating spoon; two wide-mouthed stoppered bottles, holding about 700 c.c.; three ditto, holding about 300 c.c.; cylindrical gas jar, 18 X 5 cm.; ground-glass disc, 8cm. in diameter; taper on wire (Fig. 9); cedar matches; pieces of watch-spring; German tinder, or fusee; crucible tongs; jug of water; blotting-paper; potassium chlorate; manganese dioxide; sulphur. In the first place the materials for the preparation of the gas should be got ready, as it is important that they should have time to dry thoroughly. If this precaution be neglected, the flask in which they are to be heated is not unlikely to crack during the experiment, owing to the moisture condensing in the neck and dropping down upon the hotter portions of the glass. When potassium chlorate is heated it fuses, and at a higher temperature gives off all the oxygen which it contains1. A very pure gas may be obtained by these means, but the temperature at which the decomposition takes place is so high that ordinary glass flasks cannot support it without softening. It is found, however, that if the salt be mixed with manganese dioxide, the decomposition takes place at a much lower temperature, and with greater rapidity. The manganese dioxide does not, apparently, give up any of the oxygen which it contains: at any rate, it is found at the close of the action to be ...


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Product Details
  • ISBN-13: 9780217832632
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 152 mm
  • No of Pages: 206
  • Spine Width: 12 mm
  • Width: 229 mm
  • ISBN-10: 0217832636
  • Publisher Date: 14 Oct 2010
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 308 gr


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