Answered: Researchers working on a Lake measured…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

Researchers working on a Lake measured the following in the anoxic bottom waters:
[Fe²⁺] = 100 μM and [S2-] = 50 fM (femtomolar).

The formation of FeS(s)Fe²⁺ + S^2- is an important controlling reaction for the solubility
of Fe(+II) under anoxic conditions. In this lake, the temperature at the bottom is about 10°C in
the summer.
a. Calculate K_ideal for this reaction, ignoring non-idealities.
b. Correct K for the temperature at the lake bottom.
c. Is the lake water at equilibrium with FeS(s) in the aquifer? If not, given more time,
would more solid dissolve or precipitate?

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