ScienceAsia 3 (1977): 073-082 |doi: 10.2306/scienceasia1513-1874.1977.03.073

MEASUREMENT OF EFFECTIVE DIFFUSION COEFFICIENTS IN MIXTURES OF ACID AND BASE

S. OSUWAN^a and D.D. KRISTMANSON^b

Summary: Effective diffusion coefficients have been measured for sodium hydroxide-hydrochloric acid mixtures at various concentration ratios and temperatures. The measurements were made in a simple diffusion cell. By applying a moving plane interface technique to the data, diffusivities were calculated. Effective Schmidt numbers of the mixtures were also evaluated. Dependency of effective Schmidt number on temperature was found to agree well with the theory.

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a Chemical Technology Department, Chulalongkorn University, Bangkok, Thailand.
b Chemical Engineering Department, University of New.Brunswick, N.B., Canada.

Received 4 May 1977