When 0.5 mole of phosphoric acid is dissolved in aqueous solution, how many moles of-ve and +ve ions are collected altogether?
Correct answer: D. 2.0
- A. 0.5
- B. .01
- C. 1.5
- D. 2.0
Explanation
Phosphoric acid (H₃PO₄) dissociates in aqueous solution into three moles of hydrogen ions H+ and one mole of phosphate ions (PO4)3- . Therefore, for each mole of phosphoric acid, four moles of ions are formed (3 moles of H+ and 1 mole of (PO4)3- .If 0.5 moles of phosphoric acid is dissolved, the total number of moles of ions formed is: 0.5 mol × 4 mol/ion =2.0 molTherefore, the correct answer is (d) 2.0.
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