A group of students investigated the solubility and acidity of Substance X in Solvent Z. Study 1 Students added varying concentrations of Substance X to 100 mL of Solvent Z at a constant temperature of 25°C. They measured the final pH of the solution.
| Concentration of X (M) | Final pH |
|---|---|
| 0.1 | 6.2 |
| 0.5 | 5.4 |
| 1.0 | 4.8 |
| 2.0 | 4.1 |
Study 2 Students kept the concentration of Substance X constant at 1.0 M and varied the temperature of 100 mL of Solvent Z, measuring the final pH.
| Temperature (°C) | Final pH |
|---|---|
| 10 | 5.2 |
| 25 | 4.8 |
| 40 | 4.5 |
| 60 | 4.1 |
Study 3 Students added a Catalyst (Y) to a 1.0 M solution of Substance X at 25°C and measured the time it took for the pH to stabilize.
| Amount of Catalyst Y (mg) | Time to Stabilize (sec) | Final pH |
|---|---|---|
| 0 | 120 | 4.8 |
| 5 | 85 | 4.8 |
| 10 | 40 | 4.8 |
| 15 | 15 | 4.8 |