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A student needs to prepare a buffer solution at pH=3.20. How many mL of pure HCOOH (K_a =1.8×10^{−4}, density =1.22 g/mL) needs to be added to 100.0 mL of 1.0 M NaOH solution to make the required buffer?

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A student needs to prepare a buffer solution at pH=3.20. How many mL of pure HCOOH (K_a =1.8×10^{−4}, density =1.22 g/mL) needs to be added to 100.0 mL of 1.0 M NaOH solution to make the required buffer?

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