Activity coefficient of a neutral molecule. We use the approximation that the activity coefficient (γ) of neutral molecules is 1.00. A more accurate relation is log γ = kμ, where μ is ionic strength and k ‰ˆ for NH3 and CO2 and k ‰ˆ 0.2 for organic molecules. With activity coefficients for HA, A-, and H+, predict the value of the quotient below for benzoic acid (HA = C6H5CO2H). The observed quotient is 0.63 ± 0.03.12

[H JIAT] 0) on quotient _-_ [HA] -(at H IA ] [HA] (at 0.1 M)