Lime is applied to water to _________________.

Lime is applied to water to _________________.

• A. adjust pH or alkalinity
• B. improve taste
• C. reduce chlorine demand
• D. reduce color

Answer: (A)

Lime is used to raise pH and increase alkalinity in water. When lime (calcium hydroxide) dissolves, it supplies hydroxide ions that neutralize acidity, lifting the pH. It also adds carbonate species, boosting alkalinity, which buffers pH changes and supports downstream treatment like coagulation and metal precipitation. This makes lime a tool for pH and alkalinity control, rather than primarily for taste improvement, chlorine demand reduction, or color removal.

Lime is used to raise pH and increase alkalinity in water. When lime (calcium hydroxide) dissolves, it supplies hydroxide ions that neutralize acidity, lifting the pH. It also adds carbonate species, boosting alkalinity, which buffers pH changes and supports downstream treatment like coagulation and metal precipitation. This makes lime a tool for pH and alkalinity control, rather than primarily for taste improvement, chlorine demand reduction, or color removal.