IGNOU BCHET 141 2026 - With the help of suitable examples differentiate between the terms-dis

Question

With the help of suitable examples differentiate between the terms-distribution coefficient and distribution ratio.

10 Jan 2026

Answer :

Word Count : 307

When a solute is distributed between two immiscible phases, usually an aqueous phase and an organic phase, two related but distinct terms are used to describe its distribution: distribution coefficient and distribution ratio. The distribution coefficient, generally denoted as K or KD, refers to the ratio of the concentrations of a solute in the two phases considering only a single, well-defined chemical species of the solute. It is applicable when the solute exists in the same molecular form in both phases and does not undergo ionization, association, or complex formation. For example, if iodine is distributed between water and carbon tetrachloride, iodine remains as I₂ in both phases. The ratio of

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