Question: Use the mean salt method and the table provided to calculate the concentration (M SO4 ) and activity of SO4 2- (a SO4 ) in

Use the mean salt method and the table provided to calculate the concentration (M_SO4) and activity of SO4^2- (a_SO4 ) in a water solution containing only Na+ and SO₄^2- ions with an ionic strength of 0.7 M. The mean activity coefficient of K₂SO₄ is: _K2SO4 = 0.37. Assume that no interactions occur between the ionic species beyond diffuse (unspecific) electrostatic forces.

Activity coefficients of individual species (in aqueous solution of ionic strength 0.70 M, at 25 degrees C):

Dissolved Species	Activity Coefficient (i)
Na⁺	0.76
HCO₃^-	0.68
K⁺	0.64
Mg²⁺	0.36
Ca²⁺	0.28
CO₃^2-	0.20

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