chemlab3 - Chem 123L Experiment 3 Weak Acid-Strong Base and...

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Chem 123L Experiment 3 Weak Acid-Strong Base and Weak Base-Strong Acid Titrations Vyvy Ta 20229611 Partner: Ryan Hoang Ta: Mahmoud Youssef Thursday, March 4, 2011
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For this experiment, the strength of an acid is determined by it's ability to let go of protons. A strong acid will give up more protons than a weak acid. The strength of an acid is inversely related to the strong of its conjugate base. This means that if an acid is strong, than it's conjugate base is weak and does not take in protons easily. The same applies in the opposite manner. If a acid is weak, its conjugate base is strong and readily accepts protons. The purpose of this experiment is to determine the concentration of an unknown strong base and unknown strong acid. Procedure: The experimental procedure used for this experiment was outlined in the CHEM 123L lab manual, Experiment #3. All steps were followed without deviation. Observations: Part A: Titation of a Weak Acid with a Strong Base Concentation of Stock Acetic Acid Solution: 0.1051 M Unknown Sodium Hydroxide: #6 Volume(mL) pH Volume(mL) pH Volume(mL) pH Volume(mL) pH 0.00 3.75 28.60 5.73 30.20 6.23 31.80 10.14 3.00 3.75 28.70 5.76 30.30 6.29 31.90 10.21 6.00 4.05 28.80 5.78 30.40 6.38 32.00 10.28 8.99 4.28 28.90 5.80 30.50 6.44 32.10 10.34 12.00 4.46 29.00 5.82 30.60 6.53 32.20 10.39 15.00 4.63 29.10 5.85 30.71 6.64 32.30 10.44 18.00 4.79 29.20 5.87 30.81 6.77 32.40 10.48 21.00 4.97 29.31 5.90 30.90 6.95 32.50 10.52 23.99 5.18 29.40 5.93 31.00 7.36 32.60 10.59 26.01 5.37 29.50 5.96 31.13* 8.22 32.70 10.59 27.98 5.61 29.60 5.99 31.20 9.07 32.80 10.62 28.10 5.64 29.70 6.03 31.30 9.45 32.90 10.65 28.20 5.66 29.80 6.08 31.40 9.67 33.00 10.67 28.30
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chemlab3 - Chem 123L Experiment 3 Weak Acid-Strong Base and...

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