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Properties of substance:

sodium metaborate


Physical appearance:

colorless trigonal crystals

Empirical formula (Hill's system):

BNaO2

Structural formula:

NaBO2

Molar/atomic mass: 65.8

Melting point (°C):

966

Boiling point (°C):

1434

Solubility (g/100 g of solvent):

water: 16.4 (0°C)
water: 20.8 (10°C)
water: 25.4 (20°C)
water: 28.2 (25°C)
water: 31.4 (30°C)
water: 40.35 (40°C)
water: 63.9 (60°C)
water: 84.5 (80°C)
water: 125.2 (100°C)
diethyl ether: insoluble
ethanol: insoluble

Density:

2.4 (20°C, g/cm3)

    Surface tension (mN/m):

    193 (1020°C)
    180 (1100°C)
    164 (1200°C)
    131 (1400°C)

    Standard molar enthalpy (heat) of formation ΔfH0 (298.15 K, kJ/mol):

    -1059 (s)

    Standard molar entropy S0 (298.15 K, J/mol·K):

    73.39 (s)

    Molar heat capacity at constant pressure Cp (298.15 K, J/mol·K):

    65.94 (s)

    References:

    1. Некрасов Б.В. Основы общей химии. - Т.2. - М.: Химия, 1973. - pp. 10
    2. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 83
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      © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru