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Chemistry

9th Edition
Steven S. Zumdahl
ISBN: 9781133611097

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BuyFindarrow_forward

Chemistry

9th Edition
Steven S. Zumdahl
ISBN: 9781133611097
Textbook Problem

When an aqueous solution of KCN is added to a solution containing Ni2+ ions, a precipitate forms, which redissolves on addition of more KCN solution. Write reactions describing what happens in this solution. [Hint: CN is a Brønsted-Lowry base (Kb ≈ 10−5) and a Lewis base.]

Interpretation Introduction

Interpretation: It is given that, when an aqueous solution of KCN is added to a solution containing Ni2+ ions, a precipitate forms, which redissolves on addition of more KCN solution. The reactions to explain these observations are to be stated.

Concept introduction: An ion or molecule that leads to the formation of coordination complex due to binding with central atom is known as ligand.

To determine: The reactions and to explain the given observations.

Explanation

Explanation

When an aqueous solution of KCN is added to a solution containing Ni2+ ions, the CN ion will acts as ligand. This ligand donate its electron pairs to Ni2+ ions to yield a precipitate Ni(CN)2 . The reaction is,

Ni2++2KCNNi(CN)2+2

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