Chapter 16, Problem 16.128SP

a)

Interpretation Introduction

To determine:

Whether $\text{FeS}$ will be precipitated or not must be determined.

b)

Interpretation Introduction

To determine:

Whether $\text{FeS}$ will be precipitated after adjusting the $\text{pH}$ to $8$ with ${\text{NH}}_{\text{3}}{\text{-NH}}_{\text{4}}{}^{\text{+} }$ buffer system.