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Experiment Name Experiment 1010 Student’s Name Dr. Anquandah April 12, 2017
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Objective: Investigate the ionization of weak acid, hydrogen sulfate ion, and determine values of K a , ∆G ° , ∆ H ° , ∆ S° . Procedure: Prepare buret using 0.1M NaOH standard solution. Pipet 25.00ml of 0.10M solution of sodium hydrogen sulfate into 125ml flask and add 2 drops of 1% phenolphthalein indicator solution, Titrate solution to endpoint, record volume to two decimal places. Record midpoint volume. Obtain 3 values within 0.05ml of each other and average the midpoint volume. Pipet another 25.00ml NaHSO 4 to 100ml beaker. Pipet average midpoint volume of NaOH standard solution. Use 50.00ml acid and 55.0ml base for calorimetry. Mass empty, dry calorimeter. Place sodium hydroxide solution in calorimeter and acid in another cup. Measure temperature of solution every 30 seconds for 4 minutes to nearest 0.1°C. Without interruption, add acid to calorimeter and stir solution gently. Measure temperature every 30 seconds for a total of 10 minutes. Measure mass of final solution by difference and plot thermogram. Results: Trial Initial Final Endpoint Midpoint 1 0.00 29.80 29.80 14.90 2 0.00 32.50 32.50 16.25 3 0.00 42.60 42.60 21.30 4 0.00 24.80 24.80 12.40 Avg midpoint 15.575
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Time (sec) Temperature (°C) Time (sec) Temperature (°C)
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K a 0.01047 ∆G° 11295.54 J/mol ∆H° -41608.6 J/mol ∆S° -177.53 J/mol•K Sample 1 Calculations: pH = 1.98 = -logK
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  • Fall '19
  • pH, Sodium hydroxide, sulfate

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