A dictionary of chemical solubilities : inorganic / by Arthur Messinger Comey.

  • Comey Arthur Messinger, 1861-
Date:
1896
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Licence: Public Domain Mark

Credit: A dictionary of chemical solubilities : inorganic / by Arthur Messinger Comey. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

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    Wlieii an excass of pulverised AsoOj la left to digest for sovfral days with cold IloO— , . , „a » 1 pt. dissolves in 50 pts. (BuclioU); In 66 pta. •FiscWr); iu 80 pts. at 15'(Hergnian); in 80 pts. if a, iM 103 pt.s. if fl (Guibort); 90 pU at 10° (Spelnian); IS. at 85-5' (Ilalin.>mann); 820 pts. H2O at 20 lol'and Xasse, 1S12.) ,0/. r\ U..O at 15'6° or below dis-solves less tlian i % AsaUs. rUaUon.) . . To dissolve 1 pt A9..O3 in 12 pts. JIM, it is necessary to boil an excess of Asoi);, with UoO ; if 1 pt. As.jO;j is ' > I nI with 12 pts. H..O, considerablii remains undis- U and even with 1 pt. AsoOa to 60-60 pts. HoO oontinued boiling is necessary to efloct solution. 11 .1 clear solution siiturated by long boiling witli an \r of As..Oa is poured off and evaporated con- iisly to I its original bulk, no AsoOg separates lud the solution contains 1 pt As^Osto 6 pts. HoO. ,i .-k lior.) 100 pts. aqueous solution of pAs.iO;) sat at 15° contain 0-90 pt. As-O i, and 1V6S pts. when sat at 100°. (Guibort) If 1 pt. pulverised AS0O3 be digested 10 ilays at 19-25° in 5-10 pts. U-iO, the sohition contains 1 pt AsoOn to 50 pts. H-iO. A solution of same strength is obtained in 25 days by digasting 1 pt. As-.O.-j iu 40 pts. HoO. If 1 pt. As..Ot be immersed in SO pts. B.-/), the resulting solution contains 1 pt AsoOs to 90 pts. Hot); if in 160 pts. H-iO, 1 pt. AS0O3 to 180 pts. H.jO; if in 240 pts. H.,0, 1 pt. AS..O3 to 280 pts. HoO; if in 1000 pts. iH»0, I'pt. ASV.O3 to 1200 pts. HoO; and even when 1 jpt! AS0O3 is digested at onliuary temperatures for Several days with 16,000-100,000 pts. H.jO, a portion lins undissolved. Pulverised aAsoOj was .set aside H.>0 iu closed bottles for 18 years; when 1 pt. > ■ was present in 1000 pts. HoO, a perfect solution 'btained ; when 1 pt AS0O3 in 100 pts. HoO, 0-017 % '; was undissolved ; when 1 pt. AsoO» in 35 pts. . 0-35 X AS0O3 was undissolved, so that the solution lined 1 pt.'As.203 to 54 pts. H2O. (Ginelin.) eolaneous mollification (aA-s-jOg) is much more'sol. •0 than the vitreous (/SAsoO;)). 100 pts. HoO at . :iary temperature dissolve 0-96 pt. /3AS..1O3 aiul 1-25 pts. aAsoOg; 100 pts. boiling HoO dissolve 9'08 pts. 3A.S0O3 and 11-47 pts. oAs-jOs ; and when the tempera- Uire'ofthis solution has fallen to 15°, the solution from 3As._.03 retains 1-78 pts., and that from oAsoOs retains 2-9 pts. (Berzelius [citing Guibort].) /3AS.2O3 dissolves more quickly and abun- iantly than aAso03. The same amount HoO HThich will take up 36-:38 pts. jSAs-^Ogat 12-13° B'ill dissolve only 12-14 pts. aAs.^03, or 100 pts. H,0dissolve4 pts./3As._,03aud 1 '2-1 '3 pts. aAsoO.,. By long boiling with HoO, aAsjOg is converted into /3AS2O3, and thus acquires the solubility of the latter, so that 100 pts. boiling HoO can take up 11 pts. As.^jOg. But at low temperature SA.s.jOa is converted into aAsoOa when in contact with H._,0, so that the solution becomes weaker after a while, and retains only the B)roportion of A.S0O3 corresponding to tlie solu- lility of aAso03. Comminution, which hastens the rate of solubility of aAsoOg without in- creasing the amount di.ssolved, diminishes the 3olul)ility of /3A.S0O3, as this is converted into aAH.p.) by the friction or contact with H.^O. As._,0m, which has been rendered opaque by XH4OH, and that whicli has been crystal- lised from an aqueous solution, arc equally sol. in K.fi. (Bussy, C.R. 24. 774 ; A. 64. 286.) 100 pts. H2O dissolve 1-707 i)ts. /SAs.jO., in 2iyears ; 100 pts. boiling H.p dissolve 11-40 pts. SAsPa in 3 hours, and 11-86 [its. in 12 hours ; 10-14 pts. oA.s.jO., in 3 hours, and 10-18 pts. in 12 hours. (Rose, Ann. Phys. (1) 36, 494.) A cold sat. solution wliich stood over excess of A.S2O:, for 10 months at 10-20° contains 1 2 % As.p.,; hot .sat. solution a few days after satura- tion contains 2-25-2-50 % Aa^O.j. If trace of HCl is present, the solution contains 3*8% AsjOa. Hot sat. solution of jiorcelaiu mod. of A&fis contains 4 days after saturation 2-4 % A.S0O3 at 24°; after 82 days at 14°, 1 '5 % ; after 4 months at 12°, 1-3 % AsA- (Bacaloglo, J. pr. 83. 111.) According to later experiments, 1 pt. aAs.Pa dissolves in 355 pts. HoO iu 1 day at 15°, wliilc 1 pt. /3AS2O3 dissolves in 108 pts. H„0 under the same conditions. 1 pt. aAsjOg dissolves in 46 pts. H2O, if solution is prepared at 100°, and allowed to stand 24 hours at 15°, while 1 pt. /3A,SoO., dissolves in 30 pts. HgO under the same conditions. (Buchner, N. Rep. Pharm. 22. 265.) 100 pts. HgO dissolve pts. aAsfi^ and /SAsoOs at ordinary temperature Time. oAs.jOs /3AS2O3 1 hour 0-023 1-589 3 hours 0-088 2-356 6 hours 0-353 3-666 12 hours 0-364 3-361 24 hours 0-956 3-306 2 days 1-627 2-629 4 days 1-814 2-429 1 week 1-673 1-763 3 weeks 1-776 1-713 2J years 1-712 1-707 In the solution of /SAsoOj octahedral crystals were deposited on the sides of the vessel after 12 hours, which continued to increase. There was no such deposit in the case of aAsgOj. From the maxima in the above table, 100 pts. HjO can dissolve 3 *7 pts. /SAsoOs and 1 -7 pts. aAsoOs at ordinary temperature. . ' 100 i5ts. boiling H2O dissolve 11-46 pts. jSAsgOs and 10-140 pts. aAs.,03 in 3 hours; 11-86 pts. /SAsoO., and 10-176 pts. aAs.,0 in 12 hours. (CI. Winkler, J. pr. (2) 31. 24'7.) 100 pts. H.,0 dissolve 1-75 pts. of a third modification (hexagonal crystalline) at ordinary temperature, and 2-75 pts. at 100°. (Claudet, Chem. Soc. (2) 6. 179.) /3As.,0., dissolves more rapidly in HCl-f Aq than aAsoOg. (Schultz-Sellac, B. 4. 109.) While 106 ccm. HoO dissolve 0-8507 g. i3As.,0., at 18-5°, 100ccm. H3Ocontaining 1 -3195 g. HC'l dissolve 1-1513 g. pAsoO^; containing 6-09 g. HCl, 1-2724 g. iSAsjOs. (Chodounsky, Listy Chemickd, 13. 114.) Much more easily sol. in many acids than iu HoO. Easily sol. in fuming HgSOj. (Schultz- Se'llac.) 100 pts.'dilutc H2S04 + Aq of various strengths dissolve at t° : t Pts. jSAsaOa f Pts. /3AH0O3 Ratios of anits. <lis- solved at 80°: 18-5' 80 1-0195 18-5 0-5422 1-88 :1 1-3664 0-7203 1-89 : 1 1-1933 0-6522 1 -84 : 1 (Chodounsky, f.c.)