Explain solid sodium hydroxide is added to the buffer system

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You have a 1.00 L buffer solution with 0.500 M NHC2O4 and 0.500 M Na2C2O4.--(1.) Determine the pH of this buffer. (2.) Some solid sodium hydroxide is added to this buffer system and the new pH is measured as 4.74. How many grams of NaOH were added? (Assume the total volume remains unchanged)

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