A text-book on chemistryFor the use of schools and colleges . s acid may be formed by burning sulphur in oxy-gen or in air; in the latter case the gas is mixed withnitrogen. The combustion may be conducted under abell-jar, the sulphur being placed on a stand. A betterprocess is to partially deoxidize sulphuric acid by heat-ing it with mercury, an oxide of mercury forming, whichis converted into a sulphate by the excess of sulphuricacid. It may also be produced by the action of sulphur-ic acid on charcoal, copper filings, or sulphur. A mix-ture of three parts of black oxide of manganese and one
A text-book on chemistryFor the use of schools and colleges . s acid may be formed by burning sulphur in oxy-gen or in air; in the latter case the gas is mixed withnitrogen. The combustion may be conducted under abell-jar, the sulphur being placed on a stand. A betterprocess is to partially deoxidize sulphuric acid by heat-ing it with mercury, an oxide of mercury forming, whichis converted into a sulphate by the excess of sulphuricacid. It may also be produced by the action of sulphur-ic acid on charcoal, copper filings, or sulphur. A mix-ture of three parts of black oxide of manganese and oneof sulphur yields it. It must be collected either overmercury or by displacement, unless a solution in wateris wanted. Sulphurous acid is usually a transparent colorless gas,of a sour taste, and suffocating, sulphurous odor. It is Of what use is sulphur in the arts? What are the oxygen com-pounds of sulphur? How may sulphurous acid be made? Whatother processes are there for its manufacture ? What are the prop-erties of sulphurous acid ? 268 SULPHUROUS entirely irrespirable, and extinguishes flame at once, be-ing for this reason employed to put out fires in chim-neys, a handful of sulphur being burnt at the bottom ofthe flue. Its specific gravity is ; one hundred cu-bic inches weigh grains. If a stream of it, whichFig. 246. has been cooled by flowing from the generating flask, a,Fig. 246, through a bent tube,#, immersed in cold water, becarried to the bottom of ajar, c, the gas will displacethe atmospheric air, floating itout of the vessel. This pro-cess, called the method of dis-placement, is useful in collecting gases soluble in taper put in a jar of sulphurous acid gas is extin-guished at once. If the jar be inverted over water, thegas rapidly dissolves, the liquid taking up about fiftytimes its volume. Alcohol absorbs 115 volumes. Veg-etable colors submitted to it are bleached, but not per-manently, as in the case of chlorine, where the coloringma
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