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Sodium bicarbonate

From Academic Kids


</table> Sodium bicarbonate (NaHCO3), or sodium hydrogen carbonate, also known as baking soda and bicarbonate of soda, is a soluble white anhydrous or crystalline compound, with a slight alkaline taste resembling that of sodium carbonate. It is found in many mineral springs and also produced artificially. It is also used as an antacid to treat acid indigestion and heartburn. The anhydrous form is also used to absorb moisture and odours; a box can be left in the refrigerator for this purpose. Additionally, a paste from baking soda can be very effective when used in cleaning and scrubbing. Used in toothpaste, baking soda helps to gently remove stains, whiten teeth, and freshen breath. Sodium bicarbonate, when exposed to an acid, releases carbon dioxide and water: Above 60 C, it gradually decomposes into sodium carbonate, water and carbon dioxide:
  • 2 NaHCO3Na2CO3 + H2O + CO2
It is used in combination with acidic compounds as a leavening agent in baking: some forms of baking powder contain sodium bicarbonate. Formerly, it was used as a source of carbon dioxide for soda water.

Safety

Although sodium bicarbonate is used as an antacid, excess consumption can raise blood pH. Sodium bicarbonate should only be consumed in solution with water.

See also

External link

Template:Cookbookpar

es:Bicarbonato sdico fr:Bicarbonate de soude nl:Natriumwaterstofcarbonaat

ja:炭酸水素ナトリウム

Properties

General

Name Sodium hydrogen carbonate
Chemical formula NaHCO3
Appearance White solid

Physical

Formula weight 84.0 amu
Melting point 270 C
(gradually decomposes above 60 °C)
Density 2.2 ×103 kg/m3
Crystal structure ?
Solubility 10.3 g in 100g water

Thermochemistry

ΔfH0solid -951 kJ/mol
S0solid 102 J/mol·K

Safety

Ingestion Safe except in very large quantities.
Inhalation May cause irritation.
Skin May cause irritation.
Eyes May cause pain and redness
More info Hazardous Chemical Database (http://ull.chemistry.uakron.edu/erd/chemicals/10/9917.html)

SI units were used where possible. Unless otherwise stated, standard conditions were used.

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