Question

A 0.001 molal solution of a complex [ma8][ma8] in water has the freezing point of 0.0054c0.0054c. Assuming 100% ionization of the complex salt and kfkf for h2o=1.86k.M1h2o=1.86k.M1, write the correct representation for the complex.

Answer 1

Correct representation for the complex is [MA6]A2.

Explanation:

The depression in freezing point can be expressed as follows:

ΔTf = kf * m * i

Given that ΔTf = 0.0054, kf = 1.86, m = 0.001, we get:

0.0054 = 1.86 * 0.001* i

Therefore i = 2.9 which approximates to 3.

So one molecule of the complex on dissociation gives 3 particles.

The complex can thus be represented by the formula [MA6]A2.