Question

Question 33 3 pts From the following list of aqueous solutions and water, select the one with the highest freezing poir O 2.0MC12H22011 (sucrose) O 1.0M KNO3 O 0.75 M Naci O 0.75 M CuCl2 O 2.0M KNO3

Answer 1

-Answer when solate is added to the solvent weiter, the freezing point of that water solution is de depressed. as we know 4TJ = Kgxm water LI solution where ATJ - Tg -7's - debression of freezing forint Where Tj freezing point of fire Tj kg → Molal clebression constant m Concentration so basically atja m. =>TJ-7'f) & m. increasing the concentration, Tt -7's will be increased so I'f will be decreased as Tf for water is fixed ie ac. So basically decreasing the concentration increasing the freezing froint of solution. i₃ vont hoff Jactor ano at dissociated iams. for 2.0 (M) C2 H22O,,,i=1 .: STd=ikoma fer 1.0 (m) KNO, KNO3 →K+ + 1:2 ATJ = ikg 2kf +NO" 2 kj

Nall i=2 for 0.750(M) Nach Nat teir ATJs ikfm = 1.5 kg for 0.75(M) Calle CuCl₂ → Cut2 + 2011, 1-3 ... ATJ = ikjm=2.25 kg far 2.0 (M) KNO > K+ thog ia2 ...Atfailem: 4 kg lowest atf value highest freezing foint of solitian 0.75(M) Nach has highest freezing point KNO3