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calculate the mean ionic activity of a 0.0350 m Na3PO4 solution for which the mean activity...

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Chemistry

calculate the mean ionic activity of a 0.0350 m Na3PO4 solutionfor which the mean activity coeffiecient is 0.685.

Answer should be: 0.0547

Please show me how to get there. Thank you

Answer & Explanation Solved by verified expert
3.7 Ratings (485 Votes)

Answer – We are given molality of Na3PO4 = 0.0350 m

The mean activity coeffiecient , γ+/- = 0.685

We know, there are 4 ions in the Na3PO4, 3 for Na+ and 1 for PO43- and we know formula for m+/-

So, m+/- = (m+ *m-)1/4* m

               = (33 * 11)1/4 * 0.0350 m

               = 0.0798

We know, ionic activity, a+/- = γ+/- * m+/-

                                              = 0.685 * 0.0798

                                               = 0.0547
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