The most convenient and has nearest approach to a universal pH measurement is
Correct answer: C. The emf method
- A. pH strips
- B. pH indicator
- C. The emf method
- D. The colorimetric method
Explanation
The emf method, often utilizing a pH meter, measures the voltage difference between electrodes and converts it to a pH value. This method provides precise, quantitative pH measurements across a wide range, making it the most universal and convenient option. In contrast, pH strips and indicators offer only rough estimates and are limited to specific pH ranges. The colorimetric method is also less precise and not ideal for universal applications.
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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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