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196 Calcium Sulfite COMPONENTS: ORIGINAL MEASUREMENTS

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196 Calcium Sulfite COMPONENTS: ORIGINAL MEASUREMENTS 196 Calcium Sulfite COMPONENTS: ORIGINAL MEASUREMENTS: 1. Calcium sulfite; Cas03; [10257-55-3] Kuz'minykh, I.N.; Babushkina, M.D. 2. Sulfur dioxide; S02; [7446-09-5] Zh. Prikl. Khim. 1956, 29, 1488-93; *J. Appl. Chem. USSR (Eng. Transl.) 1956, 29, 3. Water; H20; [7732-18-5) 1607-11. VARIABLES: PREPARED BY: Five temperatures: 278 - 333 K H.D. Lutz, B. Engelen Partial pressure of S02 EXPERIMENTAL VALUES: Solubility data of calcium sulfite in aqueous sulfurous acid solutions at different pressures of sulfur dioxide given by the authors are: a a d PS02 PS02 ,b g S02/100 g H2O CaS03 m(CaS03)d 1O-3 c 1 mm Hg bar total combined g/kg H2O mol kg- 28.5 38.0 5.49 2.4 45.0 0.375 43.2 57.6 6.76 2.92 54.7 0.456 4.5 47.2 62.9 7.0 3.0 56.3 0.468 155.5 207.3 11.78 4.46 83.6 0.696 19.2 25.6 3.51 1.6 30.0 0.250 30.3 40.4 4.36 1.95 36.6 0.304 75.7 100.9 6.8 2.92 54.8 0.456 15 103.75 138.3 7.81 3.3 61.9 0.515 155.5 207.3 9.61 3.92 73.5 0.612 227 302.6 11.55 4.67 87.6 0.729 a Corrected for PH20 by the authors. b Calculated by the compilers. c S02 required to form the monosulfite. d Calculated from the amount of combined S02 by the compilers. (continued on next page) AUXI LI ARY INFORHATION METHOU M'PARATUS/PROCEDURE: SOlIRCb ANU PURITY OF HAH-RI ALS; Aqueous solutions of sulfurous acid were Not given. kept over a calcium sulfite precipitate for several days. The equilibrium pressure of S02 was determined dynamically in a special apparatus (1) by passing oxygen-free N2 gas through the solution-precipitate mixture, and analysing the moist inert gas for S02 with iodine. Gas volume was measured in an aspirator. The solution was analysed for ESTIMATbD ~;RROR: total S02 and calcium content (1). The Not given. results are the means of several measurements. The authors report good agreement. REFERENCES; 1. Kuz'minykh, I.N.; Kuznetsova, A.G. Zh. Prikl. Khim. 1954, 27, 816. Calcium Sulfite 197 COHPONl-.NTS: ORIGINAL MEASUREMENTS: 1. Calcium sulfite; CaS03; [10257-55-3] Kuz'minykh, I.N.; Babushkina, M.D. 2. Sulfur dioxide; S02; [7446-09-5] Zh. Prikl. Khim. 1956, 29, 1488-93; *J. Appl. Chem. USSR (Eng. Transl.) 1956, 29, 3. Water; H2O; [7732-18-5] 1607-11. EXPERIMENTAL VALUES (continued): PSO a,b t/°C PS02a 2 g S02/100 g H2O CaS03d m( CaS03)d 3 c 1 mm Hg 1O- bar total combined g/kg H2O mol kg- 31 41.3 3.64 1.68 31.5 0.262 49.3 65.7 4.55 2.08 39.0 0.325 102.5 136.6 6.19 2.68 50.3 0.418 25 121 161.3 6.74 2.88 54.0 0.450 136.5 182.0 7.18 3.05 57.2 0.476 159 212.0 7.81 3.29 61.7 0.514 73.4 97.9 3.3 1.5 28.1 0.234 74.9 99.9 3.41 1.55 29.1 0.242 50 165.2 220.2 5.15 2.3 43.1 0.359 319 425.3 6.6 2.91 54.6 0.454 39.3 52.4 2.15 1.01 18.9 0.158 71.1 94.8 2.75 1.28 24.0 0.200 60 81.8 109.1 3.04 1.4 26.3 0.219 88.9 118.5 3.11 1.43 26.8 0.223 123 164.0 3.6 1.66 31.1 0.259 182 242.6 4.6 2.13 39.9 0.332 308 410.6 5.47 2.54 47.6 0.396 a Corrected for PH20 by the authors. b Calculated by the compilers. c S02 required to form the monosulfite. d Calculated from the amount of combined S02 by the compilers. 198 Calcium Sulfite COMPONENTS: ORIGINAL MEASUREMENTS: 1. Calc~um sulfite; CaS03; [10257-55-3] Marusawa, T. 2. Sulfur dioxide; S02; [7446-09-5] Kogyo KBgBku Zasshi 1917, 20, 287-301. 3. Water; H20; [7732-18-5] VARIABLES: PREPARED BY: One temperature: 291 K B. Engelen Concentration of sulfur dioxide EXPERIMENTAL VALUES: The author reports the compos~tion of aqueous sulfurous acid solutions saturated with calc~um sulf~te at 18°C. Composition of the saturated solution (mol dm-1) 102x 102x 102x 102x 105x 103x c(Ca2+) c(HS0 -) a c(CaS03)b c(Ca(HS03)2) c(H2S03) 3 c(SO/-) c(W) c(total S02 ) 2.07 1.07 1.525 2.41 3.16 3.56 0.0762 0.036 15.25 5.06 8.39 17.3 10.9 5.25 0.5286 0.2364 18.23 5.74 9.70 19.9 13.1 5.22 0.6210 0.2793 28.43 8.58 13.50 27.5 15.7 5.95 0.9294 0.4193 42.15 11.9 17.5 35.6 18.4 6.40 1.3180 0.5965 2 a Calculated as 2[Ca(HS03)2] + [H 2S03] + [HS03-] + [S03 -] by the compiler. 2 b Calculated as [Ca +] + [Ca(HS03)2] by the compiler. AUXl 1.1 ARY INFORMATION METHOD N'PARATUS/PROClDURE: SOllRC~. ANlJ PURITY OF ~L\lI.RIAI.S: Saturation method. Time for establishing Calcium sulfite was precipitated by equil~br~um not given. Calcium was passing S02 through a suspension of CaC03 determined manganometrically after in water, and analysed for calcium and prec~p~tation as calcium oxalate. Sulfite sulfate. was determined iodometrically. The amount of sulfate formed by oxidation of the sulf~te was calculated from the d~fference between the calcium and sulfite concentrat~ons. ~.S1'1MATED ERROR: REFlRENC~.S : 1. Melcher, A.C. J. Am. Chem. Soc. 1910, 32, 50. Calcium Sulfite 199 COMPONENTS: ORIGINAL MEASUREMENTS: 1. Calcium sulfite; Cas03; [10257-55-3] Schwarz, R.; Muller-Clemm, H. 2. Sulfur dioxide; S02; [7446-09-5] z. AnoTg. Allg. Chem. 1921, 34, 272-5. 3. Water; H20; [7732-18-5] VARIABLES: PREPARED BY: Temperature: 275 - 306 K B. Engelen Concentration of sulfur dioxide EXPERIMENTAL VALUES: The authors report the solubility of calcium sulfite in aqueous sulfurous acid solutions at various temperatures. trC S02/mass % m(S02total)a m( CaS03)a total combinedb mol kg-1 mol kg-1 2 7.90 5.4 1.374 0.47 11 6.75 4.56 1.155 0.390 22 6.47 4.33 1.102 0.369 23 6.48 4.34 1.104 0.370 24 6.49 4.35 1.106 0.371 24 6.58 4.40 1.123 0.375 24 7.24 4.80 1.247 0.413 24 7.96 5.17 1.384 0.449 24 10.23 6.56 1.838 0.589 24 10.74 6.86 1.944 0.621 25 6.70 4.51 1.145 0.385 26 6.75 4.55 1.155 0.389 26 9.0 6.6 1.594 0.585 a Calculated from combinedb S02 by the compiler. b Amount required to form Ca(HS03)2. (continued on next page) AUXI LI ARY INFORNATlON METHOD M'PARATUS/PROCEDURE: SOlJRCI:. AND PURITY OF HAHRI ALS; Aqueous sulfurous acid solutions were Calcium sulfite was Merck "pure" grade. saturated with calcium sulfite within Sulfur dioxide was taken from a gas 30 - 48 hr, with exclusion of oxygen. cylinder. After stirring the solution-precipitate mixture, the solid phase was allowed to settle under the S02 equilibrium pressure of the solution for 12 hr. The supernatant solution was analysed for total and combined S02 by iodometric and acidimetric titration, for calcium manganometrically after precipitation of calcium as oxalate, and for sulfate gravimetrically. ESTIMATED ~RROR: REFERENCES: 200 Calcium Sulfite COHPONENTS: ORIGINAL MEASUREMENTS: 1. Calcium sulfite; CaS03; [10257-55-3) Schwarz, R.; Miiller-Clemm, H. 2. Sulfur dioxide; S02; [7446-09-5) Z. Anorg. Allg. Chem. 1921, 34, 272-5. 3. Water; H2O; [7732-18-5) EXPERIMENTAL VALUES (continued): t/OC S02/mass % m(S02total)a m( CaS03)a total combinedb mol kg-1 mol kg-1 27 6.69 4.50 1.143 0.385 29 6.32 4.22 1.074 0.359 29 6.65 4.50 1.136 0.384 29 10.32 6.76 1.858 0.608 30 6.65 4.44 1.136 0.379 33 6.53 4.42 1.114 0.377 33 8.30 5.52 1.451 0.483 33 9.25 6.12 1.639 0.542 33 9.90 6.49 1. 771 0.580 a Calculated from combinedb S02 by the compiler. b Amount required to form Ca(HS03)2' Calcium Sulfite 201 COMPONENTS: ORIGINAL MEASUREMENTS: 1. Calcium sulfite; CaS03; [10257-55-3) Humm, W. 2. Sulfur dioxide; S02; [7446-09-5) Untersuchungen an Sulfitlaugenturmen. Diss., ETH Zurich, 1929 Guntter-Sta~b 3. Water; H20; [7732-18-5) Verlag, Biberach-Ri8, 1929. VARIABLES: PREPARED BY: Temperature: 273 - 313 K H.D. Lutz, B. Engelen EXPERIMENTAL VALUES: The author reports the composition of aqueous CaO solutions saturated with S02 at 1 and 0.1 Atm (1.013 and 0.1013 bar, PS02 + PH20, compilers) pressure. p/bar t/oC total S02 free S02a CaO m(S02 total)b m(CaS03)b mass % mass % mass % mol kg-l mol kg-l 0.1013 14.94 1.52 5.87 2.945 1.322 0.1013 °5 14.34 1.27 5.72 2.800 1.276 0.1013 10 13.87 1.08 5.59 2.688 1.238 0.1013 15 12.91 0.90 5.25 2.462 1.144 0.1013 20 12.06 0.78 4.92 2.268 1.057 0.1013 22 11.73 0.74 4.81 2.194 1.028 0.1013 24 11.
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