Using a pipette, the student transferred 25.00 mL of oxalic acid into an Erlenme

Question

Using a pipette, the student transferred 25.00 mL of oxalic acid into an Erlenmeyer flask and added 3 drops of phenolphthalein indicator. The student filled the burette with NaOH solution to be standardized and titrated against the acid until a faint pink color was reached (end point). The student obtained the following data from the titration. Volume of oxalic acid used: 25.00 mL Volume of NaOH Volume (mL) Trial I 24.85 0.00 Trial II 27.19 2.00 Trial III 25.23 0.00 Final burette reading Initial burette reading Volume of NaOH used Average volume of NaOH i. Complete the table

Explanation / Answer

For Trial 1:

Volume of NaOH used = Final burette reading - Initial burette reading = 24.85 - 0.00 = 24.85

For Trial 2:

Volume of NaOH used = Final burette reading - Initial burette reading = 27.19 - 2.00 = 25.19

For Trial 3:

Volume of NaOH used= Final burette reading - Initial burette reading = 25.23 - 0.00 = 25.23

Average volume used = 1/3 * (Trial 1 reading + Trial 2 reading + Trial 3 reading) = 1/3 * (24.85 + 25.19 + 25.23) = 25.09 mL

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