SUMMARY
The pH of pure water at 100°C is approximately 6.87, indicating it is slightly more acidic than neutral pH 7. This change occurs due to the increase in the ionic product of water (Kw) to 1.8 x 10-14 at elevated temperatures. Additionally, higher temperatures lead to increased absorption of CO2, resulting in the formation of carbonic acid (H2CO3), further lowering the pH. Thus, both temperature and CO2 absorption significantly influence the acidity of water.
PREREQUISITES
- Understanding of pH scale and its implications
- Knowledge of ionic product of water (Kw)
- Familiarity with acid-base chemistry, specifically carbonic acid formation
- Basic principles of temperature effects on chemical equilibria
NEXT STEPS
- Research the effects of temperature on Kw in detail
- Study the process of CO2 absorption in water and its impact on pH
- Learn about the implications of pH changes in aquatic environments
- Explore the role of carbonic acid in biological systems
USEFUL FOR
Chemistry students, environmental scientists, and anyone interested in the effects of temperature on water chemistry and acid-base reactions.