Abstract
The behaviour of water and sodium hydroxide in molten NaCl-KCl eutectic at 800° has been examined by means of IR spectrometry and titrimetry. The solubility of water is very small. The main reaction that takes place is H 2O+2Cl -→ 2HCl↑+O 2-. The introduction of sodium hydroxide in the bath appears to give rise to the following reactions: 2NaOH → Na 2O + H 2O↑ 4NaOH → O 2 2-+ 2Na 2 + + 2H 2O↑ SiO 2+2NaOH → SiO 3Na 2 + H 2O↑ Some sodium hydroxide is simultaneously volatilized. The different proportions of NaOH that take part in these reactions have been determined. A qualitative scale of acidity in the molten alkaline chlorides is establislied.
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