Calculate the pH of a Solution?

Calculate the ph of the solution made by adding 0.50 mol of propanoic acid (C2H5COOH or HC3O5H2) and 0.30 mol of sodium propanoate (C2H5COONa or NaC3H5CO2) to 1.00 L of water. The value of Ka for C2H5COOH is 1.3*10^-5.
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