The aqueous solution of sodium phosphate (Na₃PO₄) is:
Correct answer: B. Basic
- A. Acidic
- B. Basic
- C. Neutral
- D. Amphoteric
Explanation
Sodium phosphate is the salt of a strong base (NaOH) and a weak acid (HPO₄²⁻). The phosphate ion (PO₄³⁻) is a strong conjugate base and will hydrolyze water to produce OH⁻ ions, making the solution basic.
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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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