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7171422 
Journal Article 
Lead oxide solubility in molten NaOH and NaOH-Na2CO3 
Barbin, NM; Barbina, TM; , 
2017 
1 
Physics and Chemistry of Liquids
ISSN: 0031-9104 
TAYLOR & FRANCIS LTD 
ABINGDON 
55 
6 
696-701 
WOS:000405405300001 
Using the method of isothermal saturation, the solubility of lead oxide in NaOH and NaOH-30%Na2CO3 melts was studied under an inert helium atmosphere in the temperature range 673-873K. The temperature dependence of the lead oxide solubility m(s) (mole fractions) in the given melts is described by the equations: ln m(s)=12.174-13,490 1/? for the molten NaOH and ln m(s)=15.536-16,680 1/? for the molten NaOH-30%Na2CO3. The heterogeneous equilibrium between solid lead oxide and its saturated solution in the alkali and alkali-carbonate melts can occur according to the reaction: PbOs=Pb2+ + O2-. The model mechanism of dissolution is discussed. Thermodynamic parameters for the dissolution of lead oxide in the melts are calculated. The addition of sodium carbonate to the molten sodium hydroxide decreases the solubility of lead oxide in the melt. As the temperature of the melt rises, the lead oxide solubility in it increases. 
Sodium hydroxide; sodium carbonate; alkali-carbonate melt; lead oxide; isothermal saturation method; solubility