What is the pH of a solution that is prepared by dissolving 6.69 grams of lactic acid (formula weight = 90.08 grams/mol) and 8.77 grams of sodium lactate (formula weight = 112.06 grams/mole) in water and diluting to 700.00 mL? The Ka for lactic acid is 0.000137.

Ions gain or lose electrons

Answerthe half-reaction having the greatest tendency to occur at the anode:     i₂(aq) + 2e⁻  ⇄ 2i⁻  ;   e = +0.53 v======oxidation occurs at the anode. we must therefore find the half-reaction with the greatest tendency to oxidize.the given values of e are reduction potentials (the form of the half-reactions are of reduction).the lower the reduction potential, the higher the potential to oxidize. the half-cell with the lowest reduction potential will have the greatest tendency to oxidize at the anode.the half-reaction having the greatest tendency must be    i₂(aq) + 2e⁻  ⇄ 2i⁻    e = +0.53 vbecause its reduction potential is the lowest out of the three.

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