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18. Oxalic acid can be used, in dilute form, as wood bleach. How many milliliters of...

18. Oxalic acid can be used, in dilute form, as wood bleach. How many milliliters of 0.050 M NaOH would be required to neutralize 10.0 mL of 0.100 M H2C2O4?

What is the pH at the first and second eq. points

Answer key says 40mL, pH=2.76 and pH=9.73 I know 40mL is right but the key has not been completely reliable and I can not figure out how to get to those two pH values. Please show your work thanks!

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