Error creating thumbnail: Unable to save thumbnail to destination
|This article is a stub. You can improve Gold Refining Wiki by expanding it.|
Sodium hydroxide, also called lye or caustic soda, is a strongly caustic chemical and corrosive for several metals like aluminum or tin. Molecular weight is 39.997 g/mol. Melting point 323 °C (605 °F), boiling point 1388 °C (2534 °F). CAS number : 1310-73-2.
Sodium hydroxide reacts with lipids and proteins so it dissolves flesh. This makes it a really dangerous chemical to handle. Precautions has to be taken when using sodium hydroxide. Chemical gloves and a splash screen is a good protection.
Dissolving in water
At 25 °C a saturated sodium hydroxide solution contains 111g NaOH per 100g H2O and is a viscous white liquid.
- Solid NaOH and concentrated solutions absorbs CO2 from the atmosphere forming sodium carbonate.
- Sodium hydroxide turns silver nitrate into sodium nitrate and silver oxide.
- May steam and spatter and generate a lot of heat when dissolved in water (hydrolysis).
Keep sodium hydroxide in an air tight container to avoid turning it into sodium carbonate and absorbing moisture from the air.