   Chapter 16, Problem 14Q

Chapter
Section
Textbook Problem

# Sulfide precipitates are generally grouped as sulfides insoluble in acidic solution and sulfides insoluble in basic solution. Explain why there is a difference between the two groups of sulfide precipitates.

Interpretation Introduction

Interpretation: The grouping of sulfide precipitates as sulfides insoluble in acidic solution and as sulfides insoluble in basic solution is given. The difference between the two groups of sulfides precipitates is to be explained.

Concept introduction: The qualitative analysis is used for the detection of ions present in a given solution. The ions have a tendency to give a particular product with a given reagent. This forms the basis for the analysis of given ions.

Explanation

Explanation

To determine: The difference between the two groups of sulfides precipitates.

The dissociation of H2S occurs in two steps as it is a diprotic in nature. It means that it contains two protons, therefore it undergoes complete dissociation in two steps. The dissociation reaction is shown as,

H2SH++HSKa1=1.0×107HSH++S2Ka2=1.0×1019

The first step involves the dissociation of H2S and it leads to the formation of HS

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