The PH of Tears is __________?
Correct answer: B. 7.4
- A. 7.0
- B. 7.4
- C. 7.8
- D. 8.2
Explanation
Tears are maintained close to neutral but are usually slightly alkaline, with a pH of about 7.4. This results from dissolved salts and buffering substances in the tear fluid. Students may choose a because tears are described as nearly neutral, but nearly neutral does not mean exactly pH 7.0.
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About Buffer Solutions
Buffer solutions resist changes in pH when small amounts of acid or base are added, using a weak acid and its conjugate base or a weak base and its conjugate acid. Work includes buffer action, the common-ion effect, Henderson-Hasselbalch calculations, buffer capacity, and the difference between acidic and basic buffers.
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