Which of the following is having high pH buffer?
Correct answer: C. NH4OH/(NH4)2SO4
- A. H3PO4/ NaH2PO4
- B. H2CO3/NaHCO3
- C. NH4OH/(NH4)2SO4
- D. CH3COOH/CH3COONa
Explanation
The correct answer is NH4OH/(NH4)2SO4 because ammonium hydroxide is a weak base, which contributes to a higher pH buffer system. In contrast, the other options involve acid or mildly acidic buffer systems. H3PO4/NaH2PO4 and CH3COOH/CH3COONa are acidic, while H2CO3/NaHCO3 is neutral.
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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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