Handout4-ActivityCoef

# Handout4-ActivityCoef - CEM 834 ACTIVITY COEFFICIENTS FALL...

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Unformatted text preview: CEM 834 ACTIVITY COEFFICIENTS FALL 2005 TABLE I: Equations for the calculation of mean activity coefficients. EQUATION I REFERENCE COMMENTS- = ± +- log A Z Z I γ < 0.01 Debye and Hückel [1] a, b- = + ± +- log A Z Z I 1 B I γ å < 0.1 Debye and Hückel [1] a, b, c- = + + ± +- log A Z Z I 1 B I CI γ å up to a few molar Hückel [2] a, b, c, d- = + ± +- log A Z Z I 1 I γ < 0.1 Güntelberg [3] a, b- = + + ± +- log A Z Z I 1 I CI γ < 0.5 Guggenheim [4] a, b, d- = +- ± +- log A Z Z I 1 I I γ 0 2 . < 0.2 Davies [5, 6] a, b- = + ± +- log A Z Z I 1 1.5 I γ < 0.2 Scatchard [7] a, b- = + + + ± +- log A Z Z I 1 I CI DI 3/2 γ < 0.2 Datta and Grzybowski [8] a, b, d ( 29 ( 29 ( 29 [ ] [ ]- = + + + + +- +-- + ± +- log A Z Z I 1 1.2 I 0.72log 1 1.2 I C D 1 1 2 I 2I exp 2 I / I m Em 2 γ Pitzer [9] a, b, d 2 COMMENTS: a γ ± is the geometric mean of the thermodynamically indeterminate individual ionic...
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Handout4-ActivityCoef - CEM 834 ACTIVITY COEFFICIENTS FALL...

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