Measures acidity or alkalinity in water from 1 to 14.

Measures acidity or alkalinity in water from 1 to 14.

• A. pH Scale
• B. BOD
• C. Infiltration/Inflow
• D. Methane Gas

Answer: (A)

Measuring acidity or alkalinity in water is done with the pH scale. It runs from 0 to 14, with 7 being neutral. Values below 7 mean the water is acidic, while values above 7 mean it is alkaline (basic). Each unit change represents a tenfold change in hydrogen ion concentration, so even a small shift in pH can indicate a big change in acidity or basicity. This scale is used in water quality to gauge how acidic or basic the water is, which affects things like corrosion, aquatic life, and treatment effectiveness. The other options don’t measure acidity or alkalinity: Biological Oxygen Demand (BOD) indicates how much oxygen microorganisms need to decompose organic matter; Infiltration/Inflow refers to water entering a sewer system; methane gas is a byproduct of anaerobic processes, not a measurement of pH.

Measuring acidity or alkalinity in water is done with the pH scale. It runs from 0 to 14, with 7 being neutral. Values below 7 mean the water is acidic, while values above 7 mean it is alkaline (basic). Each unit change represents a tenfold change in hydrogen ion concentration, so even a small shift in pH can indicate a big change in acidity or basicity. This scale is used in water quality to gauge how acidic or basic the water is, which affects things like corrosion, aquatic life, and treatment effectiveness.

The other options don’t measure acidity or alkalinity: Biological Oxygen Demand (BOD) indicates how much oxygen microorganisms need to decompose organic matter; Infiltration/Inflow refers to water entering a sewer system; methane gas is a byproduct of anaerobic processes, not a measurement of pH.