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A 0.1 M solution of a weak acid, HA, has a pH of 4.74. To this solution, 0.05 moles of sodium salt of the conjugate base (NaA) is added to form a buffer system. If the total volume of the solution is 1 liter, what will be the new pH of the solution after the addition of NaA? The ( K_a ) of HA is ( 1.8 times 10^{-5} ).
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