Explosives . 100-00 122-5 1-984 1-814 The strength of the fuming acid is generally expressed as per cent, free CalculationsS03, but sometimes as total S03. When determining the strength by analysisit is most convenient to express it first as per cent. H2S04, and there are otheradvantages in expressing it thus. A figure is, of course, obtained which isgreater than 100, but it gives at once the quantity of sulphuric acid that willbe formed if 100 parts of it be added to a mixture, and if 100 be deducted fromit, the remainder is the amount of water that will disappear from the mixtureto form this
Explosives . 100-00 122-5 1-984 1-814 The strength of the fuming acid is generally expressed as per cent, free CalculationsS03, but sometimes as total S03. When determining the strength by analysisit is most convenient to express it first as per cent. H2S04, and there are otheradvantages in expressing it thus. A figure is, of course, obtained which isgreater than 100, but it gives at once the quantity of sulphuric acid that willbe formed if 100 parts of it be added to a mixture, and if 100 be deducted fromit, the remainder is the amount of water that will disappear from the mixtureto form this sulphuric acid. This remainder multiplied by S03/H20 ( =1 Lunge and Hurter, Alkali-Makers Pocket-book. SULPHURIC ACID FUSION CURVEMELTING POINT CURVECRYSTALLISATION CURVE MELTING POINT CURVEETC. OP OLEUM NOTYET POLYMERISED 3C ~ ? » * „-**« z • i\ ft ~ _ *„ / ^v / \. J 1 \ H , . , —^ -\ V~ / \ \ IJ I / \ , > i r * / v \ / / \ H^SO,, 75 j v w[.v;h2S Fig. 17. Melting-Points of Sulphuric 104. S03free -A3°C Acid and Oleum (Knietsch) 105 106 EXPLOSIVES &> i ?- — -t&l— ... |._ * > » tti * O-r • A^ p >o*+ j m (••- 4 - J N • , i| • . < f*«S „ 91 *• t 4*& _A 1 New *Reconcentratid* MinReS. oil HNOj (-ojv JSL^ ^^ u* «$ 1SS^V»^^ X -O 14*0 tMv ^5^-^s^? */_^ ^ My 1 Per Cent. H2S04Fia. 18. Specific Gravities of Sulphuric Acid 80/18 = 4-44) gives the percentage of free »S03. The percentage of H2S04multiplied by 80/98 ( = 0-8163) gives the total S03. Similar rules may bemade for converting any of these three expressions into any other : if F be the percentage of free S03 and T „ total SO, and H „ H,S04 then F = 4-444 (H — 100) = 5-444 T — 444and T = 0-8163 H = 01837 F +81-63and H = 0-225 F + 100 = 1-225 T The conversion can also be effected by means of the stales at the base of Fig. countries timing the war are Buffering more or less from a shortage ofsulphuric acid due to the enormous demands and the disturbances in thesu
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