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Questions and Answers
What is the primary function of the B-Reference electrode in a pH meter?
What is the primary function of the B-Reference electrode in a pH meter?
What would happen if the electrodes are not cleaned?
What would happen if the electrodes are not cleaned?
What is the purpose of the Temperature knob in a pH meter?
What is the purpose of the Temperature knob in a pH meter?
In which industry is the pH meter particularly used for dairy products?
In which industry is the pH meter particularly used for dairy products?
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Why is it essential to keep the probes moist when not in use?
Why is it essential to keep the probes moist when not in use?
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What is an advantage of pH meters?
What is an advantage of pH meters?
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What is a disadvantage of pH meters?
What is a disadvantage of pH meters?
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What is necessary for the accuracy and precision of the pH meter?
What is necessary for the accuracy and precision of the pH meter?
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What is the primary function of a pH meter?
What is the primary function of a pH meter?
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What is the symbol 'P' in pH derived from?
What is the symbol 'P' in pH derived from?
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What is the pH value of a solution with equal concentrations of hydrogen and hydroxyl ions?
What is the pH value of a solution with equal concentrations of hydrogen and hydroxyl ions?
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What is the purpose of the silver wire coated with silver chloride in a glass electrode?
What is the purpose of the silver wire coated with silver chloride in a glass electrode?
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What type of pH meter is ideal for laboratory use?
What type of pH meter is ideal for laboratory use?
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What is the typical measurement range of a pen pH meter?
What is the typical measurement range of a pen pH meter?
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What is the result of a pH meter measurement displayed in terms of?
What is the result of a pH meter measurement displayed in terms of?
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What is the pH scale range?
What is the pH scale range?
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Study Notes
pH Meter
- The electrode potential is constant due to the constant chloride ion concentration (0.1 M).
Reference Electrode (Calomel Electrode)
- It is used to complete the electrical circuit.
- A common reference electrode is another Ag/AgCl electrode.
- The Ag/AgCl electrode is immersed in a 0.1 M KCl solution, making contact with the test solution through a porous fiber.
Components of pH Meter
- Electrode holder
- Amplifier: amplifies the electrical charge from the electrode and passes it to the galvanometer as readable current.
- Galvanometer or Digital display
- Temperature knob: controls the temperature.
- Adjustment knob: adjusts the pH meter before taking readings.
Advantages of pH Meter
- pH calibration is low-priced and robust.
- Pocket size pH meters are user-friendly.
- Accounts are reliable and specific.
- Readings are accurate and precise.
Disadvantages of pH Meter
- Heat affects the output readings.
- pH calibration using glass electrodes requires cleaning to prevent deposition influencing the readings.
Application of pH Meter
- In agriculture industries, it measures the pH of soil.
- In municipal water supplies, it measures water quality.
- In chemical and pharmaceutical industries, it measures the pH value of solutions.
- In the food industry, it is used for dairy products like cheese, curds, and yogurts.
Maintenance of pH Meter
- Cleaning lines of the probes is essential for accuracy and precision.
- Probes are kept moist when not in use with a medium.
- Electrodes should not be allowed to become dry.
- Regular calibration of pH meter is essential.
pH Scale
- pH is a symbol that describes the degree of acidity or alkalinity.
- It is measured on a scale of 0 to 14.
- pH is derived from the negative logarithm (P) and the chemical symbol for Hydrogen (H).
pH Value
- It is directly related to the ratio of hydrogen ion (H+) and hydroxyl ion (OH-) concentrations.
- If H+ concentration is higher than OH- concentration, the material is acidic (pH < 7).
- If OH- concentration is higher than H+ concentration, the material is basic (pH > 7).
- If H+ concentration is equal to OH- concentration, the material is neutral (pH = 7).
Types of pH Meter
- Portable pH meter: covers an extensive range of regularly employed instruments.
- Desktop pH meter: ideal for laboratory use.
- Pen pH meter: composed of a single scale, conventional measurement range for easy and handy equipment.
Electrode
- There are two types of electrodes: glass electrode (measuring electrode) and Ag/AgCl electrode.
- The Ag/AgCl electrode carries current through the half-cell reaction.
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Description
This quiz covers the concept of electrode potential in electrochemistry, specifically with regards to the Ag/AgCl electrode and its use as a reference electrode in a KCl solution.
