Rank the following solutions in order of increasing osmotic pressure: 1.0 m CH₃OH, 1.0 m Ba(NO₃)₂, 2.0 m KCl, 4.0 m C₆H₁₂O₆ A)Ba(NO₃)₂

Question

Rank the following solutions in order of increasing osmotic pressure: 1.0 m CH₃OH, 1.0 m Ba(NO₃)₂, 2.0 m KCl, 4.0 m C₆H₁₂O₆ A)Ba(NO₃)₂ < CH₃OH < KCl = C₆H₁₂O₆ B)C₆H₁₂O₆ = KCl < CH₃OH < Ba(NO₃)₂ C)CH₃OH < Ba(NO₃)₂ = C₆H₁₂O₆ < KCl D)CH₃OH < Ba(NO₃)₂ < C₆H₁₂O₆ = KCl E)KCl < CH₃OH < Ba(NO₃)₂ < C₆H₁₂O₆

Quizplus · Accepted Answer

Osmotic pressure depends on the total concentration of solute particles in solution. CH₃OH is a non-electrolyte and does not dissociate, Ba(NO₃)₂ dissociates into three ions (Ba²⁺ and 2 NO₃⁻), KCl dissociates into two ions (K⁺ and Cl⁻), and C₆H₁₂O₆ does not dissociate. Considering the molarity and dissociation, the order from lowest to highest osmotic pressure is CH₃OH (1.0 m, non-dissociating), Ba(NO₃)₂ (1.0 m, but dissociates into 3 particles, effectively 3.0 m), and KCl (2.0 m, dissociates into 2 particles, effectively 4.0 m) = C₆H₁₂O₆ (4.0 m, non-dissociating).

Rank the Following Solutions in Order of Increasing Osmotic Pressure