Which of the following have almost the same pH?
Correct answer: B. Tears & blood
- A. Blood & egg (white)
- B. Tears & blood
- C. Tears & milk
- D. Milk & egg (white)
Explanation
Both human blood and tears are natural buffer systems that maintain a tightly controlled, slightly alkaline pH. The normal pH of blood is about 7.4, and the pH of tears is also very close to 7.4.
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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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