Question

which are valid ph measurement tools?

select one:
a. indicator, meter, probe
b. thermometer only
c. barometer only
d. balance only

Explanation:

Identify the target property

The question asks for valid tools used to measure pH. pH is a scale used to specify the acidity or basicity of an aqueous solution, which we understand from the pH Definition.

Analyze the given options

We evaluate the instruments listed in each option:

• Indicator, meter, probe: pH indicators (like litmus paper or liquid indicators), pH meters, and pH probes are standard laboratory tools designed to measure hydrogen ion concentration.
• Thermometer: Measures temperature, not pH.
• Barometer: Measures atmospheric pressure, not pH.
• Balance: Measures mass, not pH.

Select the correct option

Since indicators, meters, and probes are all standard instruments for determining pH, option (a) is the correct choice.

Answer:

• a. Indicator, meter, probe (Correct answer)
• b. Thermometer only
• c. Barometer only
• d. Balance only