EXPT 9:
pH, Acid-Base, Indicators,
Buffers
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Experiment 9 - pH, Acid-Base Indicators, Buffers

Procedure:

Part C - Buffers

  1. Prepare a buffer solution by mixing 50 mL of 1M acetic acid, CH3COOH, solution and 4.5 grams of sodium acetate, CH3COONa.
  2. Measure the pH of the buffer solution. Record the pH measurement on the data sheet.
  3. Divide the buffer solution into two 25 mL portions.
  4. Add 20 drops of 0.1 M HCl solution to one portion, mix and measure the pH. Record the pH measurement on the data sheet.
  5. Add 20 drops of 0.1 M NaOH solution to the other portion; mix and measure the pH. Record the pH measurement on the data sheet.
  6. Pour 50 mL of distilled water into a small beaker and measure the pH of the water. Record the pH measurement on the data sheet.
  7. Divide the distilled water into two 25 mL portions.
  8. Add 20 drops of 0.1 M HCl solution to one portion; mix and measure the pH. Record the pH measurement on the data sheet.
  9. Add 20 drops of 0.1 M NaOH solution to the other portion; mix and measure the pH. Record the pH measurement on the data sheet.

 

 

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