Abstract
Melting points of NaOH·3.5H2O in the NaOH-KOH-H2O system were measured at various ratios of potassium hydroxide to total hydroxides in the range of 33-43wt. % of total hydroxide concentration. The result showed that the melting point could be expressed by a polynominal the coefficient of which was calculated by the least square method. The measured values well agreed with the calculated values with a power of 3-5 in the polynominal, and the mean relative error was 0.1% when the power of the approximation was 4.
The authors published similar contents to this paper at the 23rd Annual Meeting of the Chemical Society of Japan held in April, 1970.
