Which of the solution among the following have highest pH?
Correct answer: B. 0.01M NaOH
- A. 0.1M H2SO4
- B. 0.01M NaOH
- C. 0.01M CH3COONa
- D. 0.1M NaHCO3
Explanation
The correct answer is Option B: 0.01M NaOH. Sodium hydroxide (NaOH) is a strong base, which fully dissociates in water, resulting in a high pH value. In contrast, 0.1M H2SO4 is a strong acid, which significantly lowers the pH. 0.01M CH3COONa (sodium acetate) forms a slightly basic solution due to hydrolysis, but it is much weaker than NaOH. 0.1M NaHCO3 (sodium bicarbonate) is a weak base, offering a pH higher than neutral but still not as high as the strong base NaOH.
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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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