Aqueous solution of sodium phosphate is
Correct answer: B. Basic
- A. Acidic
- B. Basic
- C. Neutral
- D. Amphoteric
Explanation
The aqueous solution of sodium phosphate is basic. This is because sodium phosphate is the salt of a strong base (sodium hydroxide, NaOH) and a weak acid (phosphoric acid, H3PO4). In water, sodium phosphate dissociates to produce hydroxide ions (OH-), making the solution basic. Option A is incorrect because an acidic solution results from the presence of excess hydrogen ions (H+), which is not the case here. Option C is incorrect as a neutral solution has a pH of 7, which sodium phosphate does not achieve. Option D is incorrect because sodium phosphate does not exhibit amphoteric properties in solution.
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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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