You find 425.0 ml of 0.350 M sodium oxalate in the lab, and you want to use it to make a buffer with a pH of 1.50. What mass of oxalic acid (MW = 90.03 g/mol, Ka= 5.9 × 10–2) is needed to make this buffer? (Neglect any volume changes due to the addition of solid oxalic acid.)

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