Lessons in elementary physics / by Balfour Stewart.

  • Balfour Stewart
Date:
1895
Catalogue details

Licence: Public Domain Mark

Credit: Lessons in elementary physics / by Balfour Stewart. Source: Wellcome Collection.

    464/502 page 444
    that 3 of anj' other substance can be found by the following rule :— ^ _ H X A a where H is electro-chemical equivalent of hydrogen, A is the atomic weight of the substance, and a is its atomicity. Example.—Find the electro-chemical equivalent of copper in copper sulphate. Answer.—Since H = '0000105 grammes, ^ = ^3'5> a = 2. „ '0000105 X b-!'? Z =: ^2 li-P = 000333 2 The following table gives some of the more important electro-chemical equivalents. Table No. 46.- Name of Body. Hydrogen Gold Silver Cupric salts Cuprous salts Nickel . Oxygen -Electro-Chemical Eocivalents. (Irammes per Coulomb. . o'00001038 . o'00067911 . o'ooiiiSio . o'ooo328i . o'ooo6562 0-0003043 . 0-00008286 A knowledge of the electro-chemical equivalent will enable us to calculate the amount of substance liberated by a given current in a certain length of time. Thus if M be the number of grammes liberated, C the strength of the current in amperes, and / the time in seconds, then M = C/3. Example.—Find the .amount of copper deposited from copper sulphate by a current of to amperes in three hours. Answer.—The quantity of electricity passed is 10 X 3 X 60 X 60= 108000 coulombs. Hence M = 108,000 X '0003281 = 35'435 grammes. 4-37. Miscellaneous Effects.—If .a piece of heav}' glass be subjected to the action of a powerful electro-magnet, and it ;i
    No text description is available for this image
    No text description is available for this image
    No text description is available for this image