Xn xn ab chemical equilibria in solution consider the

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Unformatted text preview: n express the equilibrium constant in terms of mole-fractions Kx: P n C +n D −n A −n B , where K = Kx æ P ö P èø nC nD xx K x = CA DB . xn xn AB Chemical Equilibria in Solution: Consider the aqueous reaction nPP(aq) + nQQ(aq) W nRR(aq) + nSS(aq). If the standard state is taken to be a concentration of 1 mol dm–3 of solution (i.e., a 1 molar solution), the equilibrium constant used is KC, defined as follows: K = C (c R / c  ) n R (c S / c  ) n S , (c P / c  ) n P (c Q / c  ) n Q where the standard concentration, c° = 1 mol dm–3, is included only to ensure that KC is dimensionless. If the standard state is taken to be 1 mol kg–1 of solvent (i.e., a 1 molal solution), a more accurate representation is possible in terms of “activities.” Activities are similar to fugacities in t...
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This document was uploaded on 02/28/2014 for the course CHEM 311 at LA Tech.

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