A 0.15 M solution of BaCl₂ contains: A)0.15 M Ba²⁺ ions and 0.15 M Cl^- ions. B)0.15 M Ba²⁺ ions and 0.30 M Cl^- ions. C)0.30 M Ba²⁺ ions and 0.15 M Cl^- ions. D)0.30 M Ba²⁺ ions and 0.30 M Cl^- ions. E)none of the above

Question

Quizplus · Accepted Answer

BaCl2 dissociates into one Ba2+ ion and two Cl- ions. Ba2+ reacts with S2- ions to form BaS solid, leaving half the Cl- ions remaining in solution. Therefore, the solution contains 0.15 M Ba2+ ions and 0.30 M Cl- ions. BaS dissociates into one Ba2+ ion and one S2- ion, so the solution also contains 0.15 M S2- ions. Therefore, choice B is correct, as it contains 0.15 M BaS and 0.30 M Cl-.

A 0.15 M Solution of BaCl2 Contains

A 0.15 M Solution of BaCl₂ Contains