Javelle Water

Javelle water or Javel water (both: zhəvĕl`), Fr. eau de Javelle, aqueous solution of sodium or potassium hypochlorite. It was originally made near the French town of Javelle (now part of Paris) and was the first chemical bleach, a use first demonstrated by C. L. Berthollet in 1785. It was produced by passing chlorine gas through a water solution of potash (potassium carbonate). After the invention of bleaching powder Javelle water was sometimes produced by reacting the bleaching powder with potash or soda ash (sodium carbonate). Now usually sodium hypochlorite solution, it is used in bleaching and as a disinfectant.

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Javelle Water 

an aqueous solution of sodium hypochlorite, NaCIO, with an admixture of sodium chloride, NaCl. Javelle water has a bleaching effect.

The name “Javelle water” was originally applied in 1789 to the bleaching fluid made in a chemical works in the Paris suburb of Javelle; it was made by passing chlorine into a cold solution of potassium hydroxide or potassium carbonate:

2KOH + CI₂ = 2KCIO + H₂O

or

K₂CO₃ + CI₂ = KCIO + KCI + CO₂

In 1822 the French pharmacist A. J. Labarraque (1777–1850), by treating a sodium carbonate solution (Na₂CO₃) with chlorine, prepared a bleaching fluid (Labarraque’s solution) that completely replaced Javelle water and was less costly to prepare. In the course of time, the name “Javelle water” was transferred to Labarraque’s solution, which, along with chlorinated lime, is used extensively for bleaching in the paper and textile industries.