Which instrument measures pH?

Which instrument measures pH?

• A. Litmus paper
• B. Triple beam scale
• C. Graduated cylinder
• D. Pipet

Answer: (A)

Measuring how acidic or basic a solution is requires a pH indicator. Litmus paper changes color in response to hydrogen ion concentration, giving a quick, practical assessment of whether a solution is acidic or basic and roughly how strong it is. Though it won’t provide an exact pH number like a pH meter or universal indicators, it directly reflects the presence of acidity or basicity, which is exactly what pH testing aims to reveal. The other instruments serve different purposes: a triple beam scale measures mass, a graduated cylinder measures volume, and a pipet transfers precise volumes of liquid. So litmus paper is the tool that directly relates to pH measurement.

Measuring how acidic or basic a solution is requires a pH indicator. Litmus paper changes color in response to hydrogen ion concentration, giving a quick, practical assessment of whether a solution is acidic or basic and roughly how strong it is. Though it won’t provide an exact pH number like a pH meter or universal indicators, it directly reflects the presence of acidity or basicity, which is exactly what pH testing aims to reveal.

The other instruments serve different purposes: a triple beam scale measures mass, a graduated cylinder measures volume, and a pipet transfers precise volumes of liquid. So litmus paper is the tool that directly relates to pH measurement.