Which of the following solutions has the highest osmolarity? A) 0.1 M NaCl has the highest osmolarity. B) 0.1 M BaCl₂ has the highest osmolarity. C) 0.1 M AlCl₃ has the highest osmolarity. D) All of these have the same osmolarity.

Question

Quizplus · Accepted Answer

Osmolarity is determined by the total concentration of solute particles in solution. NaCl dissociates into 2 particles (Na+ and Cl-), BaCl2 into 3 particles (Ba2+ and 2 Cl-), and AlCl3 into 4 particles (Al3+ and 3 Cl-). Therefore, 0.1 M AlCl3 has the highest osmolarity because it produces the most particles per mole of solute dissolved.

Which of the Following Solutions Has the Highest Osmolarity