Data for titration of 15.00 mL of vinegar with approximately 1.0 M NaOH. Note you must use the exact concentration of the standard NaOH solution to calculate the moles of NaOH. Quantity Example Trial 1 Trial 2 Trial 3 M NaOH (еxact concentration) 0.992 M 0.953 M 0.953 M 0.953 M V initial buret reading = V, 0.20 mL 1.20 mL 0.52 mL 0.15 mL V final buret reading = V, 12.90 mL 14.22 mL 13.71 mL 13.31 mL Vep = VNAOH 12.70 mL 13.02 mL 13.19 mL 13.16 mL added = V, - Vi Vep 3 VNaoн in L 0.01270 L 0.01302 L 0.01319 L 0.01316 L moles NaOH = MNAOH X VNAOH 0.0126 mol 0.0124 mol 0.0126 mol 0.0125 mol moles AA = moles NaOH 0.0126 mol 0.0124 mol 0.0126 mol 0.0125 mol V sample = V acid 0.0150 L 0.0150 L 0.0150 L 0.0150 L (15.00 mL) (15.00 mL) (15.00 mL) Actual molarity of AA 0.840 M 0.827 M 0.840 M 0.833 M Average molarity for 3 trials => of AA 0.833 M 1. Report the acetic acid (AA) concentration of vinegar in units of molarity (M). 2. Use your average AA concentration to calculate the mass percent of acetic acid in vinegar. 3. Explain why the red cabbage acid-base indicator from the previous pH lab would not work as the indicator for a titration.
Data for titration of 15.00 mL of vinegar with approximately 1.0 M NaOH. Note you must use the exact concentration of the standard NaOH solution to calculate the moles of NaOH. Quantity Example Trial 1 Trial 2 Trial 3 M NaOH (еxact concentration) 0.992 M 0.953 M 0.953 M 0.953 M V initial buret reading = V, 0.20 mL 1.20 mL 0.52 mL 0.15 mL V final buret reading = V, 12.90 mL 14.22 mL 13.71 mL 13.31 mL Vep = VNAOH 12.70 mL 13.02 mL 13.19 mL 13.16 mL added = V, - Vi Vep 3 VNaoн in L 0.01270 L 0.01302 L 0.01319 L 0.01316 L moles NaOH = MNAOH X VNAOH 0.0126 mol 0.0124 mol 0.0126 mol 0.0125 mol moles AA = moles NaOH 0.0126 mol 0.0124 mol 0.0126 mol 0.0125 mol V sample = V acid 0.0150 L 0.0150 L 0.0150 L 0.0150 L (15.00 mL) (15.00 mL) (15.00 mL) Actual molarity of AA 0.840 M 0.827 M 0.840 M 0.833 M Average molarity for 3 trials => of AA 0.833 M 1. Report the acetic acid (AA) concentration of vinegar in units of molarity (M). 2. Use your average AA concentration to calculate the mass percent of acetic acid in vinegar. 3. Explain why the red cabbage acid-base indicator from the previous pH lab would not work as the indicator for a titration.
Chapter15: Acid-base Equilibria
Section: Chapter Questions
Problem 7RQ: Sketch the titration curve for a weak acid titrated by a strong base. When performing calculations...
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