4 Which of the following solutions exhibits the greatest osmotic pressure, assuming all the solutions have the same molarity? (A)NaCl (B)MgCl₂ (C)MgSO₄ (D)HCl (E)Glucose

2 Which of the following acids and its sodium salt are the best combination for buffering a solution at pH 4.30? (A)chloroacetic acid (Kₐ=1.35×10⁻³) (B)propanoic acid (Kₐ=1.3×10⁻⁵) (C)benzoic acid (Kₐ=6.4×10⁻⁵) (D)hypochlorous acid (Kₐ=3.5×10⁻⁸) (E)none of the above is acceptable