Question

The freezing point of 1 molal Molal NaCl Solution assuming NaCl to be 100% Dissociated in water is _____.(Kf=1.86)

Answer 1

Hey miss
✡here is ur answer ✡
I Hope this will help
#Prem✌❤

Answer 2

Answer:

The freezing point of 1 molal NaCl Solution assuming NaCl to be 100% Dissociated in water is -3.72°C.

Explanation:

The depression in freezing point is given by:

$\Delta T_f=i\times K_f\times m$

$\Delta T_f=T-T_f$

where,

$\Delta T_f$= change in boiling point  = 0.81 K

$T_f$=Boiling point of the solution

T = freezing point of the pure solvent

i = van't Hoff factor

$K_f$= freezing point constant  = 1.86 K/kg mol

m = molality

Given: m = 1 m, $K_f$=1.86 °C/kg mol

Freezing point of water = T = 0°C

$NaCl\rightarrow Na^++Cl^-$

100% dissociation means sodium chlorides dissociates completely in its aqueous solution.The two ions are formed in the solution :$Na^+,Cl^-$

i = 2

$\Delta T_f=2\times 1.86 ^oC/kg mol\times 1m=3.72^oC$

$\Delta T_f=3.72^oC=0^oC-T_f$

$T_f=-3.72^oC$

The freezing point of 1 molal NaCl Solution assuming NaCl to be 100% Dissociated in water is -3.72°C.