A table shows the solubility of a gas in water at different temperatures and pressures.
| Temperature (°C) | Pressure (atm) | Solubility (g/L) |
|---|---|---|
| 10 | 1 | 0.05 |
| 10 | 2 | 0.10 |
| 10 | 3 | 0.15 |
| 20 | 1 | 0.04 |
| 20 | 2 | 0.08 |
| 20 | 3 | 0.12 |
| 30 | 1 | 0.03 |
| 30 | 2 | 0.06 |
| 30 | 3 | 0.09 |
Based on the data, what is the effect of increasing temperature on the solubility of the gas at a constant pressure of 2 atm?
Correct: B
To determine the effect of temperature at a constant pressure of 2 atm, we look at the rows where pressure is 2 atm:
- At 10°C and 2 atm, solubility is 0.10 g/L.
- At 20°C and 2 atm, solubility is 0.08 g/L.
- At 30°C and 2 atm, solubility is 0.06 g/L.
As the temperature increases from 10°C to 20°C (a 10°C increase), the solubility decreases from 0.10 g/L to 0.08 g/L, which is a decrease of 0.02 g/L.
As the temperature increases from 20°C to 30°C (another 10°C increase), the solubility decreases from 0.08 g/L to 0.06 g/L, also a decrease of 0.02 g/L.
Therefore, solubility consistently decreases by 0.02 g/L for every 10°C increase at a constant pressure of 2 atm.