Benzoic acid (C₂H5CO₂H), a weak acid, has a dissociation constant of K=6.3x10^-5.   1. Write the equilibrium equation of the solution.   2. Write the Ka expression of the equilibrium involved.   3. What is the equilibrium concentration of all species if the   initial concentration is a.) 0.0315M, b) 0.315M²   4. What is the resulting pH and pOH for a) and b)?   5. What is the %ionization of benzoic acid in a) and b) solution?

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