The pH variation of the electrophoretic mobility, u=e/E, of solid Th(OH)4 in 10-
ID: 1089723 • Letter: T
Question
The pH variation of the electrophoretic mobility, u=e/E, of solid Th(OH)4 in 10-2 M HNO3-KOH electrolyte is as follows:
(a) Estimate the isoelectric point (IEP) of Th(OH)4. (b) Using = fHe/(r0E) Calculate the zeta potential, , of Th(OH)4 as a function of pH. =0.89 cp, cp= centipoises=0.01 poise, 1 poise=(dyne/cm2 )sec=0.1 (N/m2 )sec =0.1 Pasec, r=80, r=8.85x10-12 C2 J-1 m-1 . Show your calculation and units. Assume fH=1 and the equation is called the Smoluchowski equation. Answer: 30.2 mV, 27.7 mV, 16.4 mV, 12.6 mV, -1.26 mV, -13.9 mV, -18.9 mV.
(c) Plot the zeta potential of Th(OH)4 as a function of pH.
pH 7.6 8 9 9.6 10 10.6 11.3 u (10-4 cm2s-1V-1) 2.4 2.2 1.3 1 -0.1 -1.1 -1.5Explanation / Answer
We plot u against pH then we can find pH at which speed is zero that pH is isoelectric point. Here , velocity passes through zero at pH 9.96 therefore isoelectric point is 9.96.
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.