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    Home > Chemicals Industry > Chemical Technology > Solubility of alkaline earth metal salts

    Solubility of alkaline earth metal salts

    • Last Update: 2021-06-30
    • Source: Internet
    • Author: User
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    Alkaline earth metal salts also show characteristic colors in high-temperature flames (flame color test), such as orange-red for calcium flames, magenta for strontium flames, and green for barium flames
    .

    1.
    Solubility of salt

    Except for beryllium, alkaline earth metal salts are all ionic compounds, and salts formed with monovalent anions are generally soluble in water
    .
    Nitrate , chloride, acetate , bicarbonate , dihydrogen phosphate, etc.
    are easily soluble in water

    .
    Among the halides, only fluoride is insoluble

    .

    Alkaline earth metal salt solubility and high negative charge of the anion generally small, such as carbonates, phosphates and oxalates are insoluble
    .
    BeSO
    4 and MgSO 4 are easily soluble in water, CaSO 4 , SrSO 4 , and BaSO 4 are insoluble; BeCrO 4 and MgCrO 4 are easily soluble in water, and CaCrO 4 , SrCrO 4 , and BaCrO 4 are insoluble
    .

    The solubility of salts formed by complex anions with large radii and cations with large radii is generally small
    .
    The large cation radius can avoid contact between the anions in the crystal, and the crystal lattice energy is larger

    .

    2.
    Salt crystal water and double salt

    The charge of alkaline earth metal ions is higher than that of alkali metals, and the salt has a greater tendency to carry crystal water, such as MgCl 2 ·6H 2 O, CaCl 2 ·6H 2 O, MgSO 4 ·7H 2 O, CaSO 4 ·2H 2 O, BaCl 2 2H · 2 O
    .
    Anhydrous salts of alkaline earth metals have water absorption, such as anhydrous CaCl
    2 is an important desiccant
    .

    3.
    Thermal decomposition of oxo acid salt

    The thermal stability of alkaline earth metal oxyacid salts is generally lower than that of alkali metal oxyacid salts
    .
    The reason is that alkaline earth metal cations have high charge, small radius, strong polarization ability, and lower decomposition temperature of oxyacid salt

    .

    The products of thermal decomposition of alkaline earth metal carbonates are metal oxides and carbon dioxide
    .

    MgCO 3 =MgO+CO 2

    The products of thermal decomposition of alkaline earth metal nitrates are metal oxides, nitrogen dioxide and oxygen
    .

    2Mg(NO 3 ) 2 =2MgO+4NO 2 +O 2

    The thermal decomposition products of alkaline earth metal sulfates are metal oxides and sulfur trioxide , and sulfur trioxide decomposes at higher temperatures
    .

    MgSO 4 =MgO+SO 3

     

     

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