Dental chemistry and metallurgy / Clifford Mitchell.

  • Mitchell, Clifford, 1854-1939.
Date:
1893
Catalogue details

Licence: Public Domain Mark

Credit: Dental chemistry and metallurgy / Clifford Mitchell. Source: Wellcome Collection.

    48/440 (page 28)
    Ascertain the weight of a bottle, put into it the proper weight of solid then add liquid enough to make up the final weight. For example, suppose it is required to make a 4 per cent, solution of cocaine hydrochlorate: weight of bot- tle, 400 grains; weight of bottle plus cocaine, 404 grains. It is evident that enough water must now be poured into the bottle, while in the scale-pan, to make the final weight 500 grains. Result, four grains of cocaine in nine- ty-six of water, or a four per cent solution. Examples: supposing weight of bottle to be 400 grains how would a one per cent solution of corrosive sublimate be made? a one in iooo?f a 20 per cent solution of car- bolic acid? Give total weights (bottle included) and the weights of the separate ingredients. Answers: one grain of corrosive sublimate and ninety- nine of water. One grain of the solid and nine hundred and ninety-nine grains of water. 98. Specific Volume.— The relative bulks of equal weights of different bodies is their specific volume. Water being taken as a unit, the specific volume of any substance is the volume of a certain weight of it com- pared to that of an equal weight of water at 150 C. (59.6° F.). To find specific volume, divide the volume of a given weight of the liquid by the volume of an equal weight of water, or divide the specific gravity of water (which is 1 or 1000) by the specific gravity of the liquid. For example: what is the specific volume of glycerine? 100 grains of glycerine measure 84 minims; 100 grains of ■fCarefully notice the difference between one in a thousand and one to a thousand.