Which electronic instrument is used to determine the acidity or alkalinity of a soil or water solution?

Which electronic instrument is used to determine the acidity or alkalinity of a soil or water solution?

• A. Hand Lens
• B. pH Meter
• C. Calipers
• D. Spectrophotometer

Answer: (B)

Measuring acidity or alkalinity centers on pH, which reflects hydrogen ion activity in a solution. An electronic pH meter uses a glass electrode and a reference electrode to sense these ions and gives a numeric pH value on a display. This direct reading lets you quickly and accurately determine whether soil or water is acidic or basic, which is essential because pH affects nutrient availability and microbial activity in soils. Other tools serve different purposes. A hand lens only magnifies particles, calipers measure dimensions, and a spectrophotometer reads how much light a solution absorbs to infer concentration of certain substances—not a direct, universal measure of pH.

Measuring acidity or alkalinity centers on pH, which reflects hydrogen ion activity in a solution. An electronic pH meter uses a glass electrode and a reference electrode to sense these ions and gives a numeric pH value on a display. This direct reading lets you quickly and accurately determine whether soil or water is acidic or basic, which is essential because pH affects nutrient availability and microbial activity in soils.

Other tools serve different purposes. A hand lens only magnifies particles, calipers measure dimensions, and a spectrophotometer reads how much light a solution absorbs to infer concentration of certain substances—not a direct, universal measure of pH.