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Univer × Univers x Univer: × Univer Univer X Univer X saplinglearning.com/ib php?id-4345415 Learning 4Jump to.. Print CaloulutorPerlodic Table Question 6 of 8 Sapling Learning 100 lonic Activilty Calculate the acivily coelficient, y, of Fe?* when the lonic strength of the solution, , is 0091 M: (a) by linear interpolaion of the data in the table to the right 0001 0 870 .000.749 001 0.05 0.1 Number 0.675 0.485 hDebcion a 25,hare he on104 (b) by using the extended size is 600 pm Check Answer ONeal

Explanation / Answer

Activity coefficient for Fe2+ (Yfe2+)

ionic strength u = 0.091 M

(a) by linear interpolation

From the table

activity coefficient at ionic strength 0.05 M = 0.485

activity coefficient at ionic strength 0.1 M = 0.405

So,

Yfe2+ = 0.485 - [(0.091 - 0.05)/(0.1 - 0.05)] (0.485 - 0.405)

           = 0.4194

(b) by extended debye-huckel equation,

log Yfe2+ = -0.51 z^2 sq.rt.(u)/[1 + (a sq.rt.(u)/305)]

with,

z = 2

a = 600 pm

so,

log Yfe2+ = -0.51 x 2^2 x sq.rt.(0.091)/[1 + (600 x sq.rt.(0.091)/305)]

Yfe2+ = 0.411

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