How does temperature influence disinfectant demand and solubility in water treatment?

How does temperature influence disinfectant demand and solubility in water treatment?

• A. Higher temperatures generally decrease reaction rates and solubility remains constant.
• B. Lower temperatures always increase solubility of disinfectants.
• C. Temperature has no effect on disinfectant demand or solubility.
• D. Higher temperatures generally increase reaction rates and may affect disinfectant demand and solubility.

Answer: (D)

Temperature changes how fast chemical reactions occur and how substances dissolve. When water warms, disinfection reactions happen more quickly, so the disinfectant can be used up faster and you may need more to reach the same level of disinfection—this is higher disinfectant demand at higher temperatures. Temperature also affects solubility: for many solids, solubility increases with higher temperature (though gases often become less soluble as temperature rises), so the amount of chemical that can dissolve in water can change. Because of these effects, saying that higher temperatures generally increase reaction rates and may affect disinfectant demand and solubility best captures the way temperature influences these processes.

Temperature changes how fast chemical reactions occur and how substances dissolve. When water warms, disinfection reactions happen more quickly, so the disinfectant can be used up faster and you may need more to reach the same level of disinfection—this is higher disinfectant demand at higher temperatures. Temperature also affects solubility: for many solids, solubility increases with higher temperature (though gases often become less soluble as temperature rises), so the amount of chemical that can dissolve in water can change. Because of these effects, saying that higher temperatures generally increase reaction rates and may affect disinfectant demand and solubility best captures the way temperature influences these processes.