Question

For 0.002 m CaCl2 at 25°C use Debye-Hückel limiting law to calculate the mean activity coefficient? Select one: a. 0.83 b. 0.71 c. 0.91 d. 0.55 e. 0.62 Next page

Answer 1

This question can be solved by Calculating ionic strength as shown below Using formula

I = 1/2[m1z1^2 + m2z2^2] where m are molality of ions and z is charge on ions.

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Call C 2+ +26 0.001m 0.002 m 0.004m Now, I = $ (Meht 22 + mera) -1 (0-0024(2)%+0+004(1) I = 0.006 Formula log Yt = -0.50g 2² VI = -0.509 (2² 10.006 logr1 = = 0.1577 TE z 0.802 18I Z 0.8

Thus, option (A) 0.83 is Correct.

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