Which instrument would you use to measure the pH of a solution?

Which instrument would you use to measure the pH of a solution?

• A. Spectrophotometer
• B. pH meter
• C. Turbidity meter
• D. Conductivity meter

Answer: (B)

The pH meter is the appropriate instrument for measuring the pH of a solution because it is specifically designed to determine the acidity or basicity of a solution based on the hydrogen ion concentration. A pH meter typically consists of a probe and a digital display that provides a precise and accurate reading of the pH level. The probe contains a glass electrode that responds to the concentration of hydrogen ions in the solution. When immersed in the solution, the glass electrode generates a voltage that correlates to the pH value, allowing for quick and reliable analysis. Other instruments, such as a spectrophotometer, are used for measuring the absorbance or transmittance of light in a solution to analyze the concentration of specific compounds. A turbidity meter measures the clarity of a liquid by assessing the scattering of light, which can indicate the presence of suspended particles, but it does not provide information about pH. A conductivity meter is used to measure the electrical conductivity of a solution, which reflects the ion concentration but does not directly indicate pH levels. Therefore, each of these alternative instruments serves a distinct analytical purpose and is not suitable for pH measurement.

The pH meter is the appropriate instrument for measuring the pH of a solution because it is specifically designed to determine the acidity or basicity of a solution based on the hydrogen ion concentration. A pH meter typically consists of a probe and a digital display that provides a precise and accurate reading of the pH level. The probe contains a glass electrode that responds to the concentration of hydrogen ions in the solution. When immersed in the solution, the glass electrode generates a voltage that correlates to the pH value, allowing for quick and reliable analysis.

Other instruments, such as a spectrophotometer, are used for measuring the absorbance or transmittance of light in a solution to analyze the concentration of specific compounds. A turbidity meter measures the clarity of a liquid by assessing the scattering of light, which can indicate the presence of suspended particles, but it does not provide information about pH. A conductivity meter is used to measure the electrical conductivity of a solution, which reflects the ion concentration but does not directly indicate pH levels. Therefore, each of these alternative instruments serves a distinct analytical purpose and is not suitable for pH measurement.