DIAPHRAGM CELL MEASUREMENT OF MUTUAL DIFFUSION-COEFFICIENTS FOR POTASSIUM HYDROXIDE IN WATER FROM 1 DEGREES-C TO 25-DEGREES-C

Integral diffusion coefficients were measured for potassium hydroxide over a concentration range of 0.1 M to 11 M at 1, 10, and 25 degrees C using the simplified diaphragm cell procedure of Mills, Woolf, and Wa tts. Differential diffusion coefficients were calculated using the ite rative regression method of Stokes over the same concentration and tem perature range. An empirical correlation relating the differential dif fusion coefficients as a function of temperature and concentration was made with a standard error of 8 x 10(-7) cm(2).s(-1) and an average d eviation of 5 x 10(-7) cm(2).s(-1).