2. Place 100mL of DI water into a 250.mL beaker. |
2. Place 50. mL of 0.10M acetic acid solution into a 250.mL beaker. |
3. Using the pH probe, determine the DI water pH. Record. |
3. Using the pH probe, determine the pH of the 0.10M acetic acid solution. Record. |
4. Before entering lab, you determine the mass of sodium acetate you needed to add the 100.mL of DI water to get a 0.10M sodium acetate solution. You will weigh out that amount of the salt and add it to the solution. Stir until all salt is dissolved. (Note: you used the 0.10M acetic acid solution to dissolve the salt instead of using DI water). |
4. Before entering lab, you determine the mass of sodium acetate you needed to add to the 50.mL of 0.10M acetic acid solution to get a 0.10M sodium acetate solution. You will weigh out that amount of the salt and add it to the solution. Stir until all salt is dissolved. (Note: you used the 0.10M acetic acid solution to dissolve the salt instead of using DI water). |
6. Using the 0.10M sodium hydroxide solution, add 2 drops of this solution into the buffer solution. Record new solutions pH. Repeat 2 more times. If the pH has not change significantly (i.e. from pH =4.32 to pH=9.05), then keep on adding drops of strong base until it does. Record total number of drops of strong base added and the final pH of the solution. |
6. Using the 0.10M sodium hydroxide solution, add 2 drops of this solution into the buffer solution. Record new solutions pH. Repeat 1 more times. If the pH has not change significantly (i.e. from pH =4.32 to pH=9.05), then keep on adding drops of strong base until it does. Record total number of drops of strong base added and the final pH of the solution. |