Lab Notes
Sub-Experiment 1¶
Add sodium hydroxide: 1.000g
Add 250mL water: 251.000g
NaOH concentration: 0.100008M
benzoic acid needed to react with 20.00mL of 0.100M NaOH: 0.244246g
Add 0.244g benzoic acid, mass: 0.244g
add two drops of phenolphthalein, mass: 0.344g
initial ph: 2.97
| Titrant Added | End Point Passed? |
|---|---|
| 0.5mL | |
| 1.1mL | |
| 1.6mL | |
| 2.1mL | |
| 2.6mL | |
| 3.1mL | |
| 4.1mL | |
| 5.2mL | |
| 6.2mL | |
| 6.7mL | |
| 7.7mL | |
| 8.2mL | |
| 9.2mL | |
| 10.2mL | |
| 11.7mL | |
| 13.2mL | |
| 14.2mL | |
| 15.2mL | |
| 16.2mL | |
| 17.7mL | |
| 19.2mL | |
| 20.2mL | passed |
| Titrant Added | End Point Passed? |
|---|---|
| 18.5mL | |
| 19mL | |
| 19.2mL | |
| 19.4mL | |
| 19.5mL | |
| 19.6mL | |
| 19.7mL | |
| 19.8mL | |
| 19.9mL | |
| 20mL | yes |
pH when end point passed: 9.42
Calculated concentration of NaOH: 0.100M
Sub-Experiment 2¶
acetic acid added: 25mL
initial pH: 3.10
| Titrant Added | End Point Passed? |
|---|---|
| 1.5mL | |
| 3.5mL | |
| 5.5mL | |
| 6.5mL | |
| 9mL | yes |
| Titrant Added | End Point Passed? |
|---|---|
| 6mL | |
| 6.9mL | |
| 7.5mL | |
| 8.4mL | |
| 8.9mL | |
| 9mL | yes |
pH: 9.21
Concentration of acetic acid #1: 0.036M
Last update:
September 24, 2021
Created: September 24, 2021
Created: September 24, 2021