Question

The elevation of boiling point of 0.10 m aqueous CrCl₃ .xNH₃ solution is two times that of 0.05m aqueous CaCl₂ solution. The value of x is____. 

[Assume 100% ionisation of the complex and CaCl₂ , coordination number of Cr as 6, and that all NH ₃ molecules are present inside the coordination sphere]

Answer 1

Correct answer is 5.00

Answer 2

2Tb=i1×kb×0.10  -(1)

Tb=i2×kb×0.05    -(2)

Solving (1)  and  (2) ,

We get i1=i2

Now i2 (for cacl2) = 3

So, i1=3

The country point hence formed is Cr[(cl) (nh3) 5]cl2.

Answer 3

ΔT_b​ = i × K_b​ × m

i × 0.1 × K_b​ = 3 × 0.05 × K_b​​ × 2

i = 3

[Cr(NH₃​)₅​Cl]Cl₂​ → [Cr(NH₃​)₅​Cl]²⁺ + Cl⁻

∴ x = 5