The pH of the tears is
Correct answer: B. 7.4
- A. 7.0
- B. 7.4
- C. 7.8
- D. 8.2
Explanation
The correct pH of tears is approximately 7.4, which is slightly alkaline. This level helps to maintain eye health by providing an effective antibacterial environment while not causing irritation. A pH of 7.0 is neutral, which is lower than the typical pH of tears, potentially affecting their protective function. A pH of 7.8 or 8.2 would be too alkaline, which could lead to eye irritation or indicate an abnormal condition.
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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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