   # What is the maximum possible concentration of Ni 2+ ion in water at 25°C that is saturated with 0.10 M H 2 S and maintained at pH 3.0 with HCl? ### Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243

#### Solutions

Chapter
Section ### Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243
Chapter 15, Problem 105CP
Textbook Problem
366 views

## What is the maximum possible concentration of Ni2+ ion in water at 25°C that is saturated with 0.10 M H2S and maintained at pH 3.0 with HCl?

Interpretation Introduction

Interpretation: The maximum possible concentration of Ni+2 ion in water that is saturated with 0.10M H2S and maintained at pH 3 with HCl is to be stated.

Concept introduction: The solubility product is the mathematical product of a substance’s dissolved ion concentration raised to its power of its stoichiometric coefficients. When sparingly soluble ionic compound releases ions in the solution, it gives relevant solubility product. The solvent is generally water.

### Explanation of Solution

Explanation

To determine: The maximum possible concentration of Ni+2 ion in water that is saturated with 0.10M H2S and maintained at pH 3 with HCl .

The dissociation constant of H2S is 1×10-26_ .

The H2S dissociates in two steps which is shown in equation (1) and equation (2).

H2SH++HSKa1=1×107 (1)

H2SH++S2-Ka2=1×1019 (2)

Equation(1) and equation(2) are added to get the overall equation which is,

H2S2H++S2

The dissociation constant (K) for the above reaction is calculated as,

K=Ka1×Ka2

Substitute the values of Ka1 and Ka2 in the above equation.

K=1×107×1×1019=1×10-26_

The dissociation constant of H2S is 1×10-26_ .

The concentration of S2- is 1×10-21M_ .

Given

The value of [H2S] is 0.10M .

The value of pH is 3 .

The concentration of H+ is calculated by the formula,

pH=log[H+]

Substitute the value of pH in the above formula.

3=log[H+][H+]=1×103M

The dissociation reaction of [H2S] is,

H2SH++HS

For the given reaction, the concentration of S2- is calculated by the formula,

K=[H+][S2-][H2S]

Where,

• K is the dissociation constant of H2S

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