Show transcribed image text Part II: Determination of molar mass by titration. The student dissolved the unknown acid in the beaker from Part I with 50 mL of water. The student then quantitatively transferred the solution into a 250 mL. Erlenmeyer flask and added 3 drops of phenolphthalein indicator. The student filled the burette with the standard solution of NaOH and titrated against the solution of the unknown acid in the Erlenmeyer flask until a faint pink color was reached (end point). The student obtained the following data from the titration. Complete the result data table below Molarity of NaOH = 0.0987 M Volume of NaOH Volume (mL) Trial I Trial II Mass of unknown acid used Final burette reading Initial burette reading Volume of NaOH used Average volume of NaOH 26.28 0.00 43.29 26.28 i. Calculate the average volume of NaOH used in the titration. ii. Calculate the number of moles of NaOH from the average volume used in the titration. The unknown acid (H2A) reacts with the average volume of NaOH according the balanced equation; ii. Calculate the number of moles of unknown acid.
Part II: Determination of molar mass by titration. The student dissolved the unknown acid in the beaker from Part I with 50 mL of water. The student then quantitatively transferred the solution into a 250 mL. Erlenmeyer flask and added 3 drops of phenolphthalein indicator. The student filled the burette with the standard solution of NaOH and titrated against the solution of the unknown acid in the Erlenmeyer flask until a faint pink color was reached (end point). The student obtained the following data from the titration. Complete the result data table below Molarity of NaOH = 0.0987 M Volume of NaOH Volume (mL) Trial I Trial II Mass of unknown acid used Final burette reading Initial burette reading Volume of NaOH used Average volume of NaOH 26.28 0.00 43.29 26.28 i. Calculate the average volume of NaOH used in the titration. ii. Calculate the number of moles of NaOH from the average volume used in the titration. The unknown acid (H2A) reacts with the average volume of NaOH according the balanced equation; ii. Calculate the number of moles of unknown acid.
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