First slide

Theory of dilute solutions

Question

PtCI₄.6H₂O can exist as a hydrated complex; 1 m aqueous solution has the depression in freezing point of 3.72 K. Assume 100% ionization and K_f(H₂O) = 1.86 Km^-1, then the complex is

Moderate

A

[Pt(H₂O)₆]CI₄
B

[Pt(H₂O)₄+Cl₂]CI₂.2H₂O
C

[Pt(H₂O)₃CI₃]Cl.3H₂O
D

[Pt(H₂O)₂CI₄].4H₂O

Solution

$∆ T_{f} = M o l a l i t y \times K_{f} \times i 3.72 = 1 \times 1.86 \times i i = 2, h e n c e c o m p l e x i s b i n a r y A l s o, C . N o f P t i s 6 a n d c o m p l e x i s h y d r a t e d .$

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