Glass electrode cannot be used to measure the pH of pure
Correct answer: D. All of the above
- A. Acetic acid
- B. Ethyl alcohol
- C. Gelatin
- D. All of the above
Explanation
A glass electrode is designed to measure pH in aqueous solutions with sufficient ionic strength. Pure acetic acid lacks the necessary conductivity without water, ethyl alcohol is non-aqueous and unable to support ion exchange, and gelatin's semi-solid nature and low ion mobility lead to unstable pH readings. Therefore, All of the above is the correct answer, as none of these substances provide the necessary conditions for accurate pH measurement using a glass electrode.
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About Acids, Bases and Salts
Acid and base behaviour is explained through the Bronsted-Lowry transfer of protons and the Lewis donation or acceptance of electron pairs. The topic includes pH, pOH, ionisation and water equilibrium, plus salt formation and hydrolysis, where a salt solution may become acidic, basic or neutral.
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