Calcium chloride tetrahydrate

CjHjoO, Ca2+ Cl-2 4 H20 a-L-Arabinopyranose calcium chloride, tetrahydrate ALARCA 38 420... 

C6H1206 Ca2+ Cl2 4 H20 yS-D-Mannofuranose calcium chloride, tetrahydrate MANCAC 30 465... 

Calcium chloride tetrahydrate, physical properties of, 4 557t Calcium chromate, molecular formula, properties, and uses, 6 56It Calcium chromate(V), 6 536... 

Chemicals and solutions. Aqueous salt solutions were prepared from water purified through reversed osmosis (conductivity 5 to 10 pS/cm at 25 °C). The following salts were used calcium chloride tetrahydrate, CaCl24H20 (Merck Suprapur), sodium hydrogen carbonate, NaHCO, (Merck p.a.) and sodium chloride, NaCl (Merck Suprapur) as supporting electrolyte. Carbon dioxide, C02(g) was of analytical grade. 

C5H18CaCl209, a-L-Arabinose calcium chloride tetrahydrate, 44B, 389 CsHi9BaOi3P, Barium ribose-5-phosphate pentahydrate, 27, 792 CsHyNaOs, Sodium ascorbate, 34B, 247 CgHyOgTl, Thallium(I) L-ascorbate, 39B, 298... 

C5H1gCaClNOaP 4 H2O, Choline phosphate calcium chloride tetrahydrate, 45B, 482... 

Calcium chloride tetrahydrate CaCl3-4H30 26094-02-4 183.046 col trici cry 1.83 ... 

Meisingset KK, Grqnvold F (1986) Thermodynamic properties and phase transitions of salt hydrates between 270 and 400 K. IV. Calcium chloride hexahydrate, calcium chloride tetrahydrate, calcium chloride dihydrate, and iron chloride (FeCI3) hexahydrate. J Chem Thermodyn 18 159-173... 

Sonnenfeld, P., and Kuehn, R. (1993). An Occurrence of Calcium Chloride Tetrahydrate in Sergipe Tachyhydrite. Kali, Steinsalz 11(5-6), 187-189. 

The properties of calcium chloride and its hydrates are summarized in Table 1. Accurate data are now available for the heats of fusion of the hexahydrate, the incongment fusion of the tetrahydrate, and the molar heat capacities of the hexahydrate, tetrahydrate, and dihydrate (1). These data are important when considering the calcium chloride hydrates as thermal storage media. A reevaluation and extension of the phase relationships of the calcium chloride hydrates, has led to new values for the heats of infinite dilution for the dihydrate, monohydrate, 0.33-hydrate, and pure calcium chloride (1). 

These three equations represent saturation with respect to the hexahydrate, tetrahydrate, and dihydrate in the temperature ranges indicated. The phase relationships among calcium chloride, its hydrates, and a saturated solution are illustrated in the diagram in Figure 1. 

Method. The organothiophosphorus insecticides are separated on silica gel with hexane-acetone (2 1 or 3 1). The plate is dried in air and sprayed with a solution of calcein-palladium chloride (0.0005 M palladium chloride in 0.1 M hydrochloric acid mixed with an equal volume of 10-3 Af calcein, adjusted to pH 7.2 with phosphate buffer and diluted with water to obtain a 2.0 10 4Af solution of palladium equilibrated overnight) which is diluted 1 1 with a 50% solution of acetone—water. When the plate is translucent it is dried in air and stored for 18—24 h in a closed chromatographic tank containing a beaker of a saturated solution of calcium nitrate tetrahydrate. This procedure permits the full fluorescence to develop under controlled humidity. The plate is then observed under a UV light at 365 nm, or scanned quantitatively at 365 nm (excitation) and 518 nm (emission). 

Phosphocholine chloride calcium salt tetrahydrate (Sigma-Aldrich, P-Chol) catalog number P0378. 

Besides the hexahydrate, the solubility curve of which has already been described, calcium chloride can also crystallise in two different forms, each of which contains 4 molecules of water of crystallisation these are distinguished as a-tetrahydrate and jS-tetrahydrate. Two other hydrates are also known, viz. a dihydrate and a monohydrate. The solubility curves of these different hydrates are given in Fig. 79. 

Magnesium sulfate heptahydrate Calcium nitrate tetrahydrate Zinc sulfate heptahydrate Ferric sulfate heptahydrate Sodium Sulfate Sodium nitrate Potassium chloride Magnesium sulfate tetrahydrate Potassium iodide Aluminum chloride hexahydrate Boric acid... 

Calcium chloride may combine with six, four, or two, molecules of water of hydration or exist in the anhydrous state. The co-ordination number of the calcium in the hexahydrate is six, but what it is in the tetrahydrate is difficult to say, since it is not known whether the chlorine is in the inner or outer zone. In the di-hydrate it may be four, and in the zero hydrate it can only be two. The external physical conditions such as concentration, vapor pressure, and temperature, determine the number of molecules of water of hydration of the calcium chloride. This shows that the co-ordination number of the calcium is dependent upon external conditions just as the ordinary valence is. 

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