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Properties of substance:

boric acid

Group of substances:

inorganic

Physical appearance:

colorless triclinic crystals

Empirical formula (Hill's system for organic substances):

H3BO3

Structural formula as text:

B(OH)3

Molar/atomic mass: 61.83

Melting point (°C):

171

Decomposition temperature (°C):

100

Solubility (g/100 g of solvent):

1,4-dioxane: soluble [Ref.]
1-propanol: 7.18 (25°C) [Ref.]
acetic acid: very soluble (118°C) [Ref.]
acetone: 0.65 (20°C) [Ref.]
ammonia liquid : 1.92 (25°C) [Ref.]
benzene: 0.4 [Ref.]
diethyl ether: 0.0087 (25°C) [Ref.]
dimethylsulfoxide: 41 (20.3°C) [Ref.]
ethanol 95%: 12.6 (25°C) [Ref.]
ethanol abs.: 11 (25°C) [Ref.]
glycerol: 24.2 (25°C) [Ref.]
glycerol 86.5%: 13.78 (20°C) [Ref.]
glycerol 99%: 22.2 (25°C) [Ref.]
hydrazine: 55 (20°C) [Ref.]
i-amyl alcohol: 4.5 (25°C) [Ref.]
i-butanol: 5.26 (25°C) [Ref.]
methanol: 26.6 (20°C) [Ref.]
nitrogen dioxide : insoluble [Ref.]
pyridine: soluble [Ref.]
sulfuric acid: very soluble [Ref.]
trichloroethylene: 0.016 (15°C) [Ref.]
water: 2.51 (-0.76°C) [Ref.]
water: 2.77 (0°C) [Ref.]
water: 3.65 (10°C) [Ref.]
water: 4.87 (20°C) [Ref.]
water: 5.74 (25°C) [Ref.]
water: 6.77 (30°C) [Ref.]
water: 8.9 (40°C) [Ref.]
water: 11.39 (50°C) [Ref.]
water: 14.89 (60°C) [Ref.]
water: 23.54 (80°C) [Ref.]
water: 28 (87.5°C) [Ref.]
water: 38 (100°C) [Ref.]
water: 41.38 (103.3°C) [Ref.]
water: 44.9 (110°C) [Ref.]
water: 54.3 (120°C) [Ref.]
water: 70 (130°C) [Ref.]
water: 89 (140°C) [Ref.]
water: 120 (150°C) [Ref.]
water: 173.2 (160°C) [Ref.]
water: 307 (170°C) [Ref.]
water: miscible (181°C) [Ref.]

Density:

1.435 (15°C, g/cm3)

Reactions:

  1. [Ref.1aster]
    2H3BO3 → B2O3 + 3H2O
  2. [Ref.1]
    B(OH)3 + 3H2S2O7 → H[B(HSO4)4] + 2H2SO4
  3. [Ref.1aster, Ref.2]
    2NH4HF2 + H3BO3 → NH4BF4 + NH3 + 3H2O
  4. [Ref.1]
    H3BO3 + 2NaHF2 → NaBF4 + NaOH + 2H2O

Dissociation:

pKa (1) = 9.24 (25°C, water)
pKa (2) = 12.74 (20°C, water)
pKa (3) = 13.8 (20°C, water)

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

-1094 (s)

Standard molar Gibbs energy of formation ΔfG0 (298.15 K, kJ/mol):

-968.8 (s)

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

88.74 (s)

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

81.34 (s)

LD50 (mg/kg):

3500-4000 (white rats, oral)

References:

  1. Comey A. M., Hahn D. A. A dictionary of Chemical Solubilities Inorganic. - 2 ed. - New York, The MacMillan Company, 1921. - pp. 96-101
  2. Lewis R.J. Sax's Dangerous Properties of Industrial Materials. - 11ed. - Wiley-interscience, 2004. - pp. 536
  3. Seidell A. Solubilities of inorganic and metal organic compounds. - 3ed., vol.1. - New York: D. Van Nostrand Company, 1940. - pp. 118-129
  4. Беликов В.Г. Учебное пособие по фармацевтической химии. - М.: Медицина, 1979. - pp. 47 [Russian]
  5. Гринвуд Н., Эрншо А. Химия элементов. - Т.1. - М.: БИНОМ. Лаборатория знаний, 2008. - pp. 195-196 [Russian]
  6. Некрасов Б.В. Основы общей химии. - Т.2. - М.: Химия, 1973. - pp. 6-7, 10 [Russian]
  7. Немодрук А.А., Каралова З.К. Аналитическая химия бора. - М.: Наука, 1964. - pp. 16-18 [Russian]
  8. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 56, 218 [Russian]
  9. Реми Г. Курс неорганической химии. - Т.1. - М., 1963. - pp. 374-375 [Russian]
  10. Спицын В.И., Мартыненко Л.И. Неорганическая химия. - Ч.1. - М.: ИМУ, 1991. - pp. 212-216 [Russian]
  11. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 297, 845-846 [Russian]
  12. Химическая технология неорганических веществ. - Кн.1, под ред. Ахметова Т.Г. - М.: Высшая школа, 2002. - pp. 235-246 [Russian]
  13. Химическая энциклопедия. - Т. 1. - М.: Советская энциклопедия, 1988. - pp. 305 [Russian]
  14. Энциклопедия для детей. - Т.17: Химия. - М.: Аванта+, 2004. - pp. 198 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru