Volume 1

A manual of chemistry for medical students / [Arthur P. Luff].

  • Arthur P. Luff
Date:
1925
Catalogue details

Licence: In copyright

Credit: A manual of chemistry for medical students / [Arthur P. Luff]. Source: Wellcome Collection.

    284/600 page 268
    probably containing true carbonic acid (H,CO,), thus: COs 4) H.07 =e, It is for this reason that carbon dioxide is also called carbonic anhydride (the anhydride of carbonic acid) and carbonic acid gas. Carbon dioxide is not a poison if swallowed into the stomach, as in the form of effervescent waters and drinks it is taken in considerable quantities, but if inhaled in quantity it produces death from suffocation, not that it unites with the hemoglobin of the blood, but because it dilutes down and keeps out the necessary oxygen of the air. After explosions in coal-mines it is the carbon dioxide, mixed with some carbon monoxide (after-damp), produced by the explosion of the marsh-gas, or fire-damp, with the air, that causes in so many cases the suffocation of the miners. Since carbon dioxide is evolved, as previously mentioned, from limekilns, it is not an uncommon occurrence for tramps and others sleeping close to a limekiln, for the sake of the warmth, to die in their sleep, suffocated by this gas. If pure carbon dioxide is inhaled it produces spasm of the glottis, and conse- quent death from asphyxia, unless the inhalation of the gas is immediately stopped. Carbon dioxide, as previously explained, is largely used in the so-called aerated waters, to give to them their effervescent character and their pleasant sharp taste. Carbon dioxide, when passed into a solution of an alkali, forms first a carbonate, and then converts the carbonate into a bicarbonate. Thus, with caustic potash it first forms potassium carbonate : By its further action it converts the carbonate into the bicarbonate : K,0Os + CO, + H,O = 2KHGO;

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