Experiment7_Oh.docx - Preparation of Buffer Solutions...

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PRE-LAB QUESTIONS 1. What would you estimate the pH of hydrochloric acid, a strong acid, to be? What is the pH of water? Hyeji Oh Experiment 7 07/29/2020 Preparation of Buffer Solutions
2. Use the Henderson-Hasselbalch equation to estimate the pH of a buffer solution that is composed of 20 mL of 10 M sodium formate and 20 mL of 1 M formic acid (Note: the pKa of formic acid is 3.75).
3. Look at Table 4 in the procedure portion of the experiment. Calculate the pH you would expect each of the buffer solutions (A, B, C, D, and E) to be using the Henderson- Hasselbalch equation, assuming that the solutions of acetic acid and sodium acetate are equimolar.
4.
EXPERIMENT 1: PREPARING A BUFFER Data Sheet Table 3: Sodium Acetate Data Sodium Acetate (g) Molarity of Sodium Acetate (Step 7) 4.0 g 0.48 M Table 4: Buffer Solutions and pH Readings for Beakers A, B, C, D, and E Buffer mL of Acetic Acid mL of Sodium Acetate pH measured A 5 5 4.1 B 5 1 3.7 C 10 1 2.8 D 1 10 4.7 E 1 5 4.6 Post-Lab Questions

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