formic acid, sodium salt, sodium hydrocarbon dioxide
|Molar mass||68.007 g/mol|
|Density||1.92 g/cm3 (20 °C)|
|Melting point||253 °C (487 °F; 526 K)|
|43.82 g/100 mL (0 °C)
97.2 g/100 mL (20 °C)
160 g/100 mL (100 °C)
|Solubility||insoluble in ether
soluble in glycerol, alcohol, formic acid
|Acidity (pKa)||7.0-8.5 (0.1M)|
|82.7 J/mol K|
|103.8 J/mol K|
Std enthalpy of
Gibbs free energy (ΔfG˚)
|EU classification||not listed|
Except where noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
|what is: / ?)(|
Sodium formate is used in several fabric dyeing and printing processes. It is also used as a buffering agent for strong mineral acids to increase their pH, as a food additive (E237), and as a de-iceing agent.
In structural biology, sodium formate can be used as a cryoprotectant for X-ray diffraction experiments on protein crystals, which are typically conducted at a temperature of 100K to reduce the effects of radiation damage.
The latter method is, in general, preferred to the former because the low aqueous solubility of CHCl3 makes it easier to separate out from the sodium formate solution, by fractional crystallization, than the soluble NaCl would be.
- Bujacz, G.; Wrzesniewska, B.; Bujacz, A. (2010), "Cryoprotection properties of salts of organic acids: a case study for a tetragonal crystal of HEW lysozyme", Acta Crystallographica Section D: Biological Crystallography 66 (7): 789–796, doi:10.1107/S0907444910015416
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