The monohydrate NaOHÂ·
2O crystallizes from water solutions between 12.3 and 61.8 Â°C. The commercially available "sodium hydroxide" is often this monohydrate, and published data may refer to it instead of the anhydrous
As one of the simplest hydroxides, sodium hydroxide is frequently utilized alongside neutral water and acidic hydrochloric acid to demonstrate the pH scale to chemistry students.
Sodium hydroxide is used in many industries: in the manufacture of pulp and paper, textiles, drinking water, soaps and detergents, and as a drain cleaner. Worldwide production in 2004 was approximately 60 million tonnes, while demand was 51 million tonnes.