Chapter 8, Problem 2STP

Interpretation Introduction

Interpretation :

Moles of ions must be chosen from the given list when 2 moles of sodium sulfate are dissolved in water.

Concept Introduction :

Aqueous solution of sodium sulfate is a strong electrolyte which dissociates completely to produce 2 moles of sodium ions and 1 mol of sulfate ion.

Answer to Problem 2STP

Correct answer: Option C is correct.

Explanation of Solution

Reason for correct option: Option C is correct because 2 moles of sodium sulfate produces 4 moles of sodium ions and 2 moles of sulfate ions. Thus total moles of ions are 6.

  ${\text{2Na}}_{\text{2}}{\text{SO}}_{\text{4}}\text{(aq)}\to {\text{4Na}}^{\text{+}}{\text{(aq)+2SO}}_{\text{4}}{}^{\text{2-}}\text{(aq)}\text{.}$

Conclusion

Reasons for incorrect options: Option A is incorrect as 2 moles sodium sulfate will not produce total 2 moles of ions.

Option B is incorrect as 2 moles sodium sulfate will not produce total 6 moles of ions.

Option D is incorrect as 2 moles sodium sulfate will not produce total 15 moles of ions.