An introduction to practical chemistry : including analysis . rong acid with twoparts of distilled water. Nitrohydrocldoric Acid (Aqua Regia). 698. This is always prepared when required, bymixing together strong nitric and hydrochloric acids,usually in the proportion of one part of nitric to fourof hydrochloric. Its chief uses depend on its intenseoxidizing or chlorinizing properties, whereby the mostrefractory metals, some of which resist the action of allother acids, are brought into solution. Hydrosulphuric Acid (HS). (Sulphuretted Hydrogen?) 699. This reagent, whether required in the gaseo
An introduction to practical chemistry : including analysis . rong acid with twoparts of distilled water. Nitrohydrocldoric Acid (Aqua Regia). 698. This is always prepared when required, bymixing together strong nitric and hydrochloric acids,usually in the proportion of one part of nitric to fourof hydrochloric. Its chief uses depend on its intenseoxidizing or chlorinizing properties, whereby the mostrefractory metals, some of which resist the action of allother acids, are brought into solution. Hydrosulphuric Acid (HS). (Sulphuretted Hydrogen?) 699. This reagent, whether required in the gaseousform or in solution, is always prepared in the of sulphide (sulphuret) of iron (FeS) areplaced in a bottle, a (Fig. 102), and treated with dilutesulphuric acid (which for this purpose should consistof one part of acid and eight parts of water), which dis-engages the gas. FeS-{-HO, S03= Fe 0, £ 0.,+HS. REAGENTS. 237 The gas thus formed, is passed through water containedin the second bottle, b, for the purpose of purifying it Fig. Sulphuretted Hydrogen Apparatus. from any sulphuric acid and iron that may have beencarried over mechanically, and is then conducted, bythe bent tube,/, into a bottle of distilled water, whenan aqueous solution of the gas is required, or into ajarcontaining any solution which it is intended to actupon (95). It must be borne in mind, when experimenting withthis gas, that it is not only highly offensive, but poison-ous, and induces headache and nausea even when largelydiluted with air: on this account it should be preparedeither near a ventilating flue, or in the open air; neverin a close room. 700. In most cases of mere testing, the aqueous solu-tion is the most convenient form in which to apply water should be saturated with the gas, of whichit is capable of retaining in solution about its ownvolume; this may be judged of by its strong disagree-able smell, resembling that of rotten eggs, and by itsgiving a copious wh
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectchemistry, bookyear18
