Chapter 23: Q41 P (page 1059)

When a basic solution of $C r {(O H)}_{4}^{-}$ ion is slowly acidified, solid $C r {(O H)}_{5}$ precipitates and then redissolves in excess acid. Ifrole="math" localid="1663334451033" width="69" height="29">Cr(OH)4- exists as $C r {^{2} H_{2} O)}_{2} {(O H)}_{4}^{-}$ , write equations that represent these two reactions.

Short Answer

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The solution of given statement is

$\begin{array}{rcl} C r {(O H)}_{4 (a q)}^{-} + H_{(a q)}^{+} & \to & C r {(O H)}_{3 (s)} + H_{2} O_{(l)} \\ C r {(H_{2} O)}_{2} {(O H)}_{4 (a q)}^{-} + H_{(a q)}^{+} & \to & C r {(O H)}_{3 (s)} + 3 H_{2} O_{(l)} \end{array}$

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Definition of Coordination Compound

A coordination complex consists of a central atom or ion, which is typically metallic and is named the coordination centre, and a surrounding array of bound molecules or ions, that are successively called ligands or complexing agents.

Solve the given statements

Basic $C r {(O H)}_{4}^{-}$ turns into solid $C r {(O H)}_{3}$ when slowly acidified. One of the OH - groups of the complex ion reacts with H⁺ in an acid-base neutralization reaction to form water:

role="math" localid="1663334602733" $\begin{array}{rcl} C r {(O H)}_{4 (a q)}^{-} + H_{(a q)}^{+} & \to & C r {(O H)}_{3 (s)} + H_{2} O_{(l)} \end{array}$

The same happens when $C r {(O H)}_{4} {(H_{2} O)}_{2}^{-}$ is given. The complex still turns into solid $C r {(O H)}_{3}$ when slowly acidified; aside from releasing one of the OH groups it also releases two moles of water into the solution:

$\begin{array}{rcl} C r {(H_{2} O)}_{2} {(O H)}_{4 (a q)}^{-} + H_{(a q)}^{+} & \to & C r {(O H)}_{3 (s)} + 3 H_{2} O_{(l)} \end{array}$

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When a basic solution of Cr(OH)4-ion is slowly acidified, solidCr(OH)5precipitates and then redissolves in excess acid. Ifrole="math" localid="1663334451033" width="69" height="29">Cr(OH)4- exists asCr2H2O)2(OH)4-, write equations that represent these two reactions.

Short Answer

Step by step solution

Definition of Coordination Compound

Solve the given statements

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Chemistry Textbooks

Physical Chemistry

Chemical Analysis

Chemistry Branches

Ionic and Molecular Compounds

Making Measurements

Chemical Reactions

Study anywhere. Anytime. Across all devices.