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For each of the following solutions, calculate the initial pH and the final pH after adding 0.0200 mol of NaOH. For 290.0 mL of a buffer solution that is 0.2975 M in CH3CH2NH2 and 0.2675 M in CH3CH2NH3Cl, calculate the initial pH and the final pH after adding 0.0200 mol of NaOH(Kb=5.6⋅10^−4).