Home
Class 12
CHEMISTRY
The elevation in boiling point of a solu...

The elevation in boiling point of a solution of `13.44`g of `CuCl_(2)`(molecular weight =`134.4,k_(b)=0.52K "molality"^(-1))` in `1` kg water using the following information will be:

A

0.16

B

0.05

C

0.1

D

0.2

Text Solution

Verified by Experts

The correct Answer is:
A
`CuCl_2` is an electrolyte which ionise in solution as follows:

Thus, number of particles after ionization `=1-alpha +alpha+2alpha=1+alpha`
`therefore " Van't Hoff factor " (i) = ("number of praticles after ionisation")/("number of particles before ionisation") or (i) =(1+2alpha)/1 ("on" 100% "ionisation" alpha=1)`
`=(1+2xx1)/1=3`
The elevation in boiling point (when collogative property is abnormal)
`DeltaT_b =ixxK_b xxm`
m is the Molality of solution
Molality of `CuCl_2` solution = `(("Weight of"" " CuCl_2 " ""in gram")/("Mol.weight of" " "CuCl_2))/("Weight of water (Solvent) in kg ")=((13.44)/(134.4))/1=0.1m`
Thus `DeltaT_b=3xx0.52xx0.1 =0.156=0.16^@C`
Promotional Banner

Similar Questions

Explore conceptually related problems

The elevation in boilng point of a solution of 13.44 g of CuCl_(2) 1 kg of water will be _____. (Molecular mass of CuCl_(2) = 134.4 and K_(b) =0.52 km^(-1))

If the elevation in boiling point of a solution of 10 g of solute (molecular weight = 100) in 100 g of water is Delta T_(b) , the ebullioscopic constant of water is

Elevation in boiling point of an aqueous solution of urea is 0.52 ( k_(b) "for water"=0.52K"molality"^(-1)) . The mole fraction is urea in this solution is :

The elevation in boiling point of a solution of 9.43 g of MgCl_2 in 1 kg of water is ( K_b = 0.52 K kg mol^(-1) , Molar mass of MgCl_2 = 94.3 g mol^(-1) )

The elevation in boiling point of a solution of 10g of a binary electrolyte (molecular mass 100) in 100g of water is DeltaT_(b) . The value of K_(b) for water is :

Calculate elevation in boiling point for 2 molal aqueous solution of glucose (Given: K_(b(H_2O) =0.5K kg mol^(-1)))

What is the boiling point of 1 molal aqueous solution of NaCl (K_b)=0.52 K molal^-1]