Question

. The i value assumes that an ionic compound dissociates 100% in solution. Is this true? Explain this by considering the percent difference in ΔT values and the behavior of ions in solution (you might want to read up on ion behavior). This is looking at three different compounds Nacl with delta T of .9 degree celcius and Na2SO4 with a delta t value of 1.1 and Na3 PO4 of a delta t of 1.5. Each of these compounds in increasing order have vant hoff factors of 2, 3 and 4.

Answer 1

Answer – We know as the compound is 100 % dissociated, means ionic compound then its vant hoff factors i value is consider, so it is true. When the ionic compound dissociates 100% in solution then there is more free particle in the solution and there is more disorder or solution and form the more ∆T and hence it is more percent difference in ΔT values. Example for the NaCl there are 2 ion like Na⁺ and Cl^- so the vant hoff factors i value is 2, for Na₂SO₄ there are 3 ions and for Na₃PO₄ there are 4 ions, so as the vant hoff factors i value increased the percent difference in ΔT values also increase, since the ΔT value is directly proportional to the vant hoff factors i.