Which of the following aqueous liquids will have the lowest freezing point?

0.5 m C12H22O11 (sucrose)

0.5 m Ca(NO3)2

0.5 m NiSO4

0.5 m Li3PO4

pure water

Question

Which of the following aqueous liquids will have the lowest freezing point?

  0.5 m C12H22O11 (sucrose)  


  0.5 m Ca(NO3)2  


  0.5 m NiSO4  


  0.5 m Li3PO4  


  pure water

jiteshmeghwal9 · Answer

Higher the number of solute particles lower will be the freezing point

jiteshmeghwal9 · Answer

(1) sucrose do not dissociate in water thus number of sucrose particles in 1 kg water is 0.5 $N_A$ particles

jiteshmeghwal9 · Answer

(2) calcium nitrate dissociate into $Ca^{+2}$ and $2NO_3^{-}$.

Total number of solute particles in the solution becomes 0.5*3* $N_A$

jiteshmeghwal9 · Answer

Similarly Nickel sulphate dissociate into $Ni^{+2}$ and $SO_4^{-2}$.

Total number of solute particles becomes 0.5*2* $N_A$

jiteshmeghwal9 · Answer

Lithium phosphate dissociate in $3Li^{+}$ and $PO_4^{-3}$ ions.

Total number of solute particles becomes 0.5*4* $N_A$

jiteshmeghwal9 · Answer

Freezing point of pure water is 0 degree Centigrade which on dissolution of solute falls

jiteshmeghwal9 · Answer

Down