Metal cations in solution are complexed to H2O molecules and exist as hydrated ions. For example, Ni2+ complexes to form the hydrated ion Ni(H2O)62+. Metal cations are also able to complex to other ligands, such as NH3. Part 1 An aqueous solution is prepared in which 0.00166 mol Ni(NO3)2 and 0.353 mol NH3 are dissolved in a total volume of 1.00 L. Classify the species present in the resulting solution according to their relative amounts. Kf for Ni(NH3)62+ is equal to 5.5 × 108. Part 2 Write the expression for the dissociation constant needed to determine the concentration of Ni(H2O)62+ ions at equilibrium in the solution formed in Part 1. Kd = ___________ Part 3 Calculate the concentration of Ni(H2O)62+ ions at equilibrium in the solution formed. ______ M

Metal cations in solution are complexed to H2O molecules and exist as hydrated ions. For example, Ni2+ complexes to form the hydrated ion Ni(H2O)62+. Metal cations are also able to complex to other ligands, such as NH3. Part 1 An aqueous solution is prepared in which 0.00166 mol Ni(NO3)2 and 0.353 mol NH3 are dissolved in a total volume of 1.00 L. Classify the species present in the resulting solution according to their relative amounts. Kf for Ni(NH3)62+ is equal to 5.5 × 108. Part 2 Write the expression for the dissociation constant needed to determine the concentration of Ni(H2O)62+ ions at equilibrium in the solution formed in Part 1. Kd = _____ Part 3 Calculate the concentration of Ni(H2O)62+ ions at equilibrium in the solution formed. M

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter12: Chemical Equilibrium

Section12.3: Determining Equilibrium Constants

Problem 12.3PSP

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Concept explainers

Potentiometric Titrations

Potentiometric titration is one of the important titration methods and is mainly carried out to characterize acid solutions. It follows a method similar to that of the normal titration technique, but the main difference is that there is no indicator used in the potentiometric titrations. Instead of using an indicator, electrodes are employed for monitoring the whole titration process. A scientist named Robert Behrend did the potentiometric titration for the first time, and it was done using the mercurous solution and potassium chloride.

Question

100%

Metal cations in solution are complexed to H₂O molecules and exist as hydrated ions. For example, Ni²⁺ complexes to form the hydrated ion Ni(H₂O)₆²⁺. Metal cations are also able to complex to other ligands, such as NH₃.

Part 1

An aqueous solution is prepared in which 0.00166 mol Ni(NO₃)₂ and 0.353 mol NH₃ are dissolved in a total volume of 1.00 L.

Classify the species present in the resulting solution according to their relative amounts. K_f for Ni(NH₃)₆²⁺ is equal to 5.5 × 10⁸.

Part 2

Write the expression for the dissociation constant needed to determine the concentration of Ni(H₂O)₆²⁺ ions at equilibrium in the solution formed in Part 1.

K_d = ___________

Part 3

Calculate the concentration of Ni(H₂O)₆²⁺ ions at equilibrium in the solution formed.

______ M

Please answer all three parts.

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