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Calcium formate

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   Calcium formate   
Names: calcium formate
calcium diformate
food additive Е238
Formula: Ca(HCOO)2
Molar mass: 130.112 g/mol
Density: 2.015 g/cm3
Crystal system: orthorhombic (α)
a=10.238 Å, b=6.305 Å, c=13.456 Åα=90°, β=90°, γ=90°
tetragonal (β)
a=6.776 Å, b=6.776 Å, c=9.50 Åα=90°, β=90°, γ=90°
tetragonal (δ)
a=6.75 Å, b=6.75 Å, c=10.04 Åα=90°, β=90°, γ=90°
Shapes:
https://en.crystalls.info/w/uploads/media/b/b7/Irregular_hexagonal_pedion.json
Irregular hexagonal pedion

Color: colorless
yellowish
Refractive index: 1.3714
Stability: stable
Toxicity: non-toxic
LD50=2650mg/kg

Description

Inorganic compound, salt of bivalent earth metal calcium and organic formic acid. Doesn't form water hydrates.

Precursors

Reaction between calcium carbonate or hydroxide, and formic acid

Chemical equation:

2HCOOH + CaCO3 = Ca(HCOO)2 + H2O + CO2↑
2HCOOH + Ca(OH)2 = Ca(HCOO)2 + 2H2O


For preparation of 100.00g of calcium formate а 76.92g of carbonate or 56.94g of hydroxide and 83.23g of 85% formic acid is required.

Add acid to the flask, then add small parts of copper compound with stirring until it will totally dissolve or, if you use carbonate, until carbon dioxide emission will stop. After reaction will stop, filter the solution and use it for crystal growing.

Storage conditions

Store in its original form or under several layers of varnish at average humidity and room temperature. Do not store in matchboxes or cotton wool and do not heat.

Solubility

Temperatureгр/100,00 гр waterгр/100,00 гр methanolгр/100,00 гр formic acid
0.8°C273.95 K <br />33.44 °F <br />493.11 °R <br />16.28
15.0°C288.15 K <br />59 °F <br />518.67 °R <br />0.27
15.5°C288.65 K <br />59.9 °F <br />519.57 °R <br />16.72
26.3°C299.45 K <br />79.34 °F <br />539.01 °R <br />17.04
30°C303.15 K <br />86 °F <br />545.67 °R <br />4.62
39.7°C312.85 K <br />103.46 °F <br />563.13 °R <br />17.36
56.6°C329.75 K <br />133.88 °F <br />593.55 °R <br />17.70
66.6°C339.75 K <br />151.88 °F <br />611.55 °R <br />0.23
76.0°C349.15 K <br />168.8 °F <br />628.47 °R <br />17.99
80.5°C353.65 K <br />176.9 °F <br />636.57 °R <br />18.07
100°C373.15 K <br />212 °F <br />671.67 °R <br />1.62


Gallery

  • Growing from water solution during several weeks, using slow evaporation method. Crystals are about ~1cm in size.Calcium formate, Martinov Maxim, redditMartinov MaximReddit

    Growing from water solution during several weeks, using slow evaporation method. Crystals are about ~1cm in size.Calcium formate, Martinov Maxim, redditMartinov MaximReddit

  • Growing from water solution during several weeks, using slow evaporation method. Crystals are about ~5mm in size.Calcium formate, Martinov Maxim, redditMartinov MaximReddit

    Growing from water solution during several weeks, using slow evaporation method. Crystals are about ~5mm in size.Calcium formate, Martinov Maxim, redditMartinov MaximReddit

  • Growing from water solution during a month, using slow evaporation method. Crystal is about ~8mm in size.Calcium formate, Martinov MaximMartinov Maxim

    Growing from water solution during a month, using slow evaporation method. Crystal is about ~8mm in size.Calcium formate, Martinov MaximMartinov Maxim

  • Growing from water solution during a month, using slow evaporation method. Crystals are about ~6..8mm in size.Calcium formate, Martinov MaximMartinov Maxim

    Growing from water solution during a month, using slow evaporation method. Crystals are about ~6..8mm in size.Calcium formate, Martinov MaximMartinov Maxim

  • Growing from water solution during a month, using slow evaporation method. Crystals are about ~6..8mm in size.Calcium formate, Martinov MaximMartinov Maxim

    Growing from water solution during a month, using slow evaporation method. Crystals are about ~6..8mm in size.Calcium formate, Martinov MaximMartinov Maxim

  • Addition of urea changed the crystal shape. Growing from water solution during about a month, using slow evaporation method. Crystal is about ~1cm in length.Calcium formate, Martinov MaximMartinov Maxim

    Addition of urea changed the crystal shape. Growing from water solution during about a month, using slow evaporation method. Crystal is about ~1cm in length.Calcium formate, Martinov MaximMartinov Maxim

  • Addition of urea changed the crystal shape. Growing from water solution during about a month, using slow evaporation method. Crystal is about ~1cm in length.Calcium formate, Martinov MaximMartinov Maxim

    Addition of urea changed the crystal shape. Growing from water solution during about a month, using slow evaporation method. Crystal is about ~1cm in length.Calcium formate, Martinov MaximMartinov Maxim

  • Addition of urea changed the crystal shape. Growing from water solution during about a month, using slow evaporation method. Crystal is about ~1cm in length.Calcium formate, Martinov MaximMartinov Maxim

    Addition of urea changed the crystal shape. Growing from water solution during about a month, using slow evaporation method. Crystal is about ~1cm in length.Calcium formate, Martinov MaximMartinov Maxim

  • Addition of urea changed the crystal shape. Growing from water solution during about a month, using slow evaporation method. Crystal is about ~1cm in length.Calcium formate, Martinov MaximMartinov Maxim

    Addition of urea changed the crystal shape. Growing from water solution during about a month, using slow evaporation method. Crystal is about ~1cm in length.Calcium formate, Martinov MaximMartinov Maxim


Sources


Navigation


   Calcium compounds
Salts

Calcium acetate (Ca(CH3COO)2) • Calcium carbonate (CaCO3) • Calcium formate (Ca(COOH)2) • Calcium nitrate (Ca(NO3)2) • Calcium sulfate (CaSO4) • Calcium tartrate (CaC4H4O6) • Calcium trifluoroacetate (Ca(CF3COO)2) • Calcium chloride (CaCl2)

Double salts

Copper-calcium acetate (CuCa(CH3COO)4) • Calcium-ammonium nitrate (5Ca(NO3)2 · NH4NO3)


   Formates

Barium formate (Ba(COOH)2) • Calcium formate (Ca(COOH)2) • Cadmium formate (Cd(COOH)2) • Copper(II) formate (Cu(COOH)2) • Copper(II) formate and urea complex (Cu(HCOO)2 · 2CO(NH2)2) • Iron(II) formate (Fe(COOH)2) • Iron(III) formate (Fe2(COOH)3) • Lead(II) formate (Pb(COOH)2) • Manganese(II) formate (Mn(COOH)2) • Strontium formate (Sr(COOH)2) • Zinc formate (Zn(COOH)2)


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