Elementary chemistry Volume 2 ; progressive lessions in experiment and theory - F. R. L. Wilson, Paperback

• Release Date   5/21/2012
• ISBN-13   9781236421159 | 978-1-236-42115-9
• ISBN   1236421159 | 1-236-42115-9
• Format   Paperback
• Author(s)   F. R. L. Wilson
• This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1906 Excerpt: ...the free wire of the galvanometer to the other binding-screw of the voltameter. After the circuit is closed note whether the needle is deflected or not. Place the following liquids successively in the voltameter so as to cover the platinum plates (electrodes):--(a) Pure distilled water. (h) solution of sugar in distilled water. (r) distilled water containing a few drops of sulphuric acid (test the liquid with blue litmus-paper after the current has been passing for some time). (d) dilute solution of sodium hydroxide. Siphon off each liquid and thoroughly rinse the voltameter with water before adding the next. Note the effects on the needle and liquid (if any) in each case. If any gas is produced, invert test-tubes full of water over each plate of the voltameter. When one tube is nearly full, break the circuit, by releasing the wire from any bindingscrew. remove the tubes, carefully closing the open end with your thumb. Test each for hydrogen and oxygen, noting from which plate the particular gas came. Roughly estimate the relative volumes of the gases. Laboratory Notes. Careful observations for each liquid. Diagram of apparatus used. Questions, (i) Which liquids conduct electricity, and which do not? (ii) Which solutions yield gases 1 (iii) Name the gases and state from which electrode they come in each case. (iv) Is the sulphuric acid solution still acid after the current has passed for some time 1 Problem (XL 6). Devise a means of modifying Exp. 6 (c) so as to find whether the whole of the acid remains after a current from a battery of 3 cells has been passed through the voltameter for 15 minutes. If your method is approved, carry it out. Exp. 7. To observe the effect of passing a current of electricity through solutions of metallic salts. Required:--As i...