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The following chart shows the solubility of various ionic compounds in water at 1 atm pressure and room temperature (approx. 25 °C, 298.15 K). "Soluble" means the ionic compound doesn't precipitate, while "slightly soluble" and "insoluble" mean that a solid will precipitate; "slightly soluble" compounds like calcium sulfate may require heat to precipitate.
The tables below provides information on the variation of solubility of different substances (mostly inorganic compounds) in water with temperature, at one atmosphere pressure. Units of solubility are given in grams of substance per 100 millilitres of water (g/100 ml), unless shown otherwise. The substances are listed in alphabetical order.
The tetrahydrate Co 3 (PO 4) 2 •4H 2 O precipitates as a solid upon mixing aqueous solutions of cobalt(II) and phosphate salts. [4] [5] Upon heating, the tetrahydrate converts to the anhydrous material.
The result: 1 liter of water can dissolve 1.34 × 10 −5 moles of AgCl at room temperature. Compared with other salts, AgCl is poorly soluble in water. For instance, table salt (NaCl) has a much higher K sp = 36 and is, therefore, more soluble. The following table gives an overview of solubility rules for various ionic compounds.
Cobalt(II) nitrate exists in the anhydrous form and the hydrate form, of which the hexahydrate is the most common. Cobalt nitrate hexahydrate (Co(NO 3) 2 ·6H 2 O) is a red deliquescence crystal that is easily soluble in water, [12] and its molecule contains cobalt(II) hydrated ions ([Co(H 2 O) 6] 2+) and free nitrate ions. [13]
The following compounds are liquid at room temperature and are completely miscible with water; they are often used as solvents. Many of them are hygroscopic.
Solubility in water. Insoluble Solubility: soluble (with degradation) in acids and alkalis: Magnetic susceptibility (χ) +7380·10 −6 cm 3 /mol Structure Crystal ...
It is soluble in cold diluted sulfuric acid and produces Co 2 [SO 4] 3, which is blue in aqueous solution. Co 2 O 3 + 3H 2 SO 4 → Co 2 [SO 4 ] 3 + 3H 2 O Cobalt(III) ion is a strong oxidizer in acidic solution, its standard electrode potential is +1.84V in this situation.