Notes for students in chemistry : being a syllabus of chemistry compiled mainly from the manuals of Fownes-Watts, Miller, Wurz, and Schorlemmer / by Albert James Bernays.

  • Albert Bernays
Date:
1878
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Licence: Public Domain Mark

Credit: Notes for students in chemistry : being a syllabus of chemistry compiled mainly from the manuals of Fownes-Watts, Miller, Wurz, and Schorlemmer / by Albert James Bernays. Source: Wellcome Collection.

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    sp. gr. 0.988, which boils at ig^'.A C. Fuming-, \^Sn\j covvo^ve. Dangerous. The acid of sp.gr. 1..5 is a liy^l''^^to S.H,20H boils^at ,.o°C. Etches glass, owing to FH^onne'or^ Silicon a volatile gascons cmnponnd, si icon ^^^f SiF Tlu.s^ SiO + aFH = lOHo + SiF,. Prep, at HF. Galcilm fluoride & disWle:i iith sdl™-c ..'cid in vessels of {-^ or^Wer and the acid is received and preserved m ves^\s ot lead s vea, platinum, or gutta-percha. F,Ca + SO,(OH), = &0,(OXa) + 2rH. xil. Boron B = 11. B2 = 22. A triad element, never native. Contained in Boras Always in combination with oxygen. By Gay-Lussac and 'e'jai'd m • 1808. Amorphous boron, a dnll-greenish powder, which so Is the fin-ers and is slightly soluble in water. NO^OH attacks and dissolves it as bo^acic acid. It burns vivuUy mto boracic ANHYDRIDE B-.O,, whcn heated in oxygen. Prep by_ heating potassium bor8-fluoride KF.BF, with the metal potassium m a . small iron vessel, and removal of the soluble potassium fluoride by water. ^Cia^BF,] + jK^ = &KF + B,. There is also a crystalline variety of boron. Nearly colorless or brown, sp. gr. 2 U Always contains aluminum boride B.Al. Very Hard : .scratches the ruby. Acids have no aclion upon it. Infusible, and only partiaUy combustible in oxy-hydrogen. Prep, by dissolving amorphous boron in fused aluminiun at a high temperature^ and removal of aluminum by hydrogen chloride. Compounds, B and 0 Boracic anhydride B.,03, = 7°- Issues as boracic acid BO(OH) H„0 with jets of steam in the maremma ot 1 uscany. Fuses to transparent glass, which remains clear on cooling Prep by heating boracic acid to redness. Volatilized with great difaculty, hence it drives out many salt-radicles ^^:lien heiitecl with their salts. Boracic acid BO(OII),OI-L or HBO„OH.,. In pearly scales, soluble in 25 parts of water at 18 C, and in ■ 3 parts of boiling water. Turns turmeric paper browm. Soluble in alcoliol and gives green color to llame. Borates are its salts: all soluble in NO^OH. Chief salt: borax or sodium ei-bouate Na,0,2B/)3 or Na^B.O^ioOH,, which is found native Dis- solved in water, it is decompo.sed by dilute sulphuric acid, and furnishes boracic acid. B and N. [Boron nitride BN = 2^.^ White amorphous powder, insoluble in water. In current ot steam, yields NHjH-B.O,. Obtained by heating B m N or better boraK with ammonium chloride. NiijO,2B203-|- JNH^CI + 2NaCl + 4H,,0 + 2BN.] B and CI. [Boron chloride BCI3 - 117.^. Colorless, mobile licpiid, of sp. gr. t.?-;, lioilmg at lyP C. Decomposed by Water into boracic and hydroehloiic acids : hence fumes in air. i'rep. by heating mixture of B^Oj