---

Question 1:

What is the function of a pH electrode?

A) Measure the concentration of dissolved oxygen
B) Determine the electrical conductivity of a solution
C) Assess the acidity or alkalinity of a solution
D) Measure the viscosity of a liquid

Show Answer

Explanation: The correct answer is C) Assess the acidity or alkalinity of a solution. A pH electrode is used to measure the acidity or alkalinity (pH) of a solution. It consists of a glass electrode that responds to changes in hydrogen ion concentration in the solution, allowing the determination of pH.

---

Question 2:

What is the ideal storage solution for a pH electrode?

A) Distilled water
B) Strong acid solution
C) Strong alkaline solution
D) pH 7 buffer solution

Show Answer

Explanation: The correct answer is D) pH 7 buffer solution. The ideal storage solution for a pH electrode is a pH 7 buffer solution. This solution helps maintain the electrode's sensitivity and accuracy by providing a stable pH environment for the electrode. It prevents the electrode from drying out and helps preserve its performance.

---

Question 3:

What is the purpose of calibrating a pH electrode?

A) To determine the electrical resistance of the electrode
B) To measure the temperature of the solution
C) To adjust the sensitivity of the electrode
D) To clean the electrode surface

Show Answer

Explanation: The correct answer is C) To adjust the sensitivity of the electrode. Calibrating a pH electrode is done to adjust its sensitivity and accuracy. During calibration, the electrode is immersed in pH buffer solutions with known pH values (usually pH 4 and pH 7 or pH 10) to ensure accurate measurements. The calibration process allows the electrode to be adjusted based on the known values, ensuring precise pH measurements.

---

Question 4:

What should be avoided when handling a pH electrode?

A) Exposing it to extreme temperatures
B) Rinsing it with distilled water after each use
C) Storing it in a dry environment
D) Using abrasive materials to clean the electrode

Show Answer

Explanation: The correct answer is D) Using abrasive materials to clean the electrode. When handling a pH electrode, it is important to avoid using abrasive materials to clean it. Abrasive materials can damage the sensitive glass membrane of the electrode, affecting its performance. Instead, gentle cleaning with soft materials or dedicated electrode cleaning solutions is recommended.

---

Question 5:

What is the typical response time of a pH electrode?

A) A few seconds
B) Several minutes
C) Hours
D) Response time varies depending on the electrode type

Show Answer

Explanation: The correct answer is D) Response time varies depending on the electrode type. The response time of a pH electrode can vary depending on the type of electrode and its design. Some electrodes have a response time of a few seconds, while others may require several minutes to stabilize and provide accurate pH readings. It is essential to consider the specific electrode's response time and allow sufficient time for stabilization before recording pH values.