Det Kemiske Syrebegrebs Udviklingshistorie Indtil 1830

95 6 Atomer, og at Kaliumchlorat, som ogsaa indeholdt 6 At. Ilt, var en Forbindelse af CZ4-Æ0,1). Senere, da han havde opdaget Euchlorine, mente han, at denne Luftart „is probably combined with the peroxide of potassium in the hyper- oxymuriate“2). Gay-Lussac imødegik disse Ideer ved at fremstille Chlorsyren i vandig Opløsning ’) og sluttede, at Kaliumchlorat var sammensat aldeles analogt med de andre Iltsyresalte af en Syre CIO, og en Base KO. Men Dayy hævdede bestandig, at de chlorsure og jodsure Salte vare „triple compounds“, og at de for- holdt sig ganske anderledes end alle andre Iltsyresalte. De mistede ved Ophedning 6 At. Ilt og bevarede ikke desto mindre deres neutrale Karakter uforandret. Han fremstillede Jodsyreanhydrid (af Euchlorine og Jod), paaviste, at det dannede krystallinske Forbindelser med flere Syrer og udtalte sig sluttelig saaledes derom: „l am desirous of marking the acid character of oxyiodine [Jodsyreanhydrid] combined with water, without applying the name acid for the anhydrous solid. It is not at all impiobable that the action of the hydrogen in the combined water is connected with the acid properties of the compound; for this acid may be regarded as a triple combination of iodine, hydrogen, and oxygen, an oxyiode (Jodat) of hydrogen, and it is possible that the hydrogen may act the same part in giving character, that potassium sodium, or the metallic bases perform in the oxyiodes (Jodaterne)’; and as hydrogen combined with iodine forms a very strong acid, and as this acid would remain, supposing all the oxygen to be taken away from the oxyiodic acid (Jodsyre) it is a fair supposition that the elements must have an influence in producing the acidity of the substances“4). — Faa Dage efter opdagede Davy Chlor- ovenlte CZO4°) og fandt, at denne Forbindelse, skjøndt den indeholdt 4 At. Ilt, ikke var en Syre. Det blev derfor meget sandsynligt, at Gay-Lussac’s Chlorsyre „owes its acid poweis to combined hydrogen44, og al den er analog med de andre chlorsure Salte, som ere „triple compounds of inflammable bases, chlorine and oxygen1'. Men endnu tydeligere præciserer han sine Anskuelser saaledes: „Till a pure combination of chlorine and oxygen is obtained, possessed of acid properties, we have no right to say Ihat chlorine is capable of being acidifyed by oxygen, and that an acid compound exists in the hyperoxymuriates“. Vi vide med Sikkerhed, at Chlor kan omdannes til en Syre ved Brint, „and when this principle exists, its energies ought not be overlooked — and all the new facts confirm, that acidity does not depend upon a peculiar elementary substance, but upon peculiar com- binations of various substances“c). Davy forkaster altsaa bestemt „principium aciditatis" i Form af bestemte Stoffer, men han gaaer endnu videre, han bryder med Dualismen og erklærer de chlor- og jodsure Salte for ternære Forbindelser. Dette *) Phil. Trans. 1811 (Works 5, 330). 2) Ib. 1811 (Works 5, 356). 3) Ann. chim. 91, 105 ff. (1814). 4) Af et Brev, dat. Rom, 10. Febr. 1815; Phil. Trans. 1815, S. 212 (Works 5, 512). 5) Sml. S. 85, Note 7. 6) Af et Brev fra Rom, dat. 15. Febr. 1815; Phil. Trans. 1815, S. 218 (Works 5, 507—508).