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A 0.035 mol sample of a weak acid, HA, is dissolved in 437 mL of water...

A 0.035 mol sample of a weak acid, HA, is dissolved in 437 mL of water and titrated with 0.46 M NaOH. After 28 mL of the NaOH solution has been added, the overall pH = 4.1938. Calculate the Ka value for HA. Enter your answer in the format: 1.23e-4

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