Phosphoric acid is a weak acid and its basicity is____________________?
Correct answer: B. 3
- A. 1
- B. 3
- C. zero
- D. 2
Explanation
Phosphoric acid is H3PO4 and has three ionisable hydroxyl hydrogens, so one molecule can neutralise three moles of a monobasic base. Its basicity is therefore 3, although its ionisation occurs stepwise and is weak. The likely trap is 1, which confuses basicity with the acid's first ionisation step.
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Periodic properties arise from electron configuration and effective nuclear charge, producing trends in atomic and ionic radius, ionization energy, electron affinity, electronegativity, metallic character and reactivity. Comparisons run across periods and down groups, with attention to common exceptions. The topic also relates these trends to the behavior of s-block and p-block elements.
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