Heavy metal sulfides like CdS and PbS are often significant components of mine tailings (the piles of waste and low-grade ores discarded by a mining operation). While these sulfides are quite insoluble in water (Ksp of CdS = 1 E -27, Ksp of PbS = 3 E -28), over the years rainwater and snowmelt can slowly dissolve small amounts of these heavy metals, washing them into streams and other natural waters. If these mine tailings are located in an area that is impacted by acid rain, would you expect heavy metal dissolution into natural waters to increase or decrease? Use chemical reactions to justify your answer.

Heavy metal sulfides like CdS and PbS are often significant components of mine tailings (the piles of waste and low-grade ores discarded by a mining operation). While these sulfides are quite insoluble in water (Ksp of CdS = 1 E -27, Ksp of PbS = 3 E -28), over the years rainwater and snowmelt can slowly dissolve small amounts of these heavy metals, washing them into streams and other natural waters. If these mine tailings are located in an area that is impacted by acid rain, would you expect heavy metal dissolution into natural waters to increase or decrease? Use chemical reactions to justify your answer.

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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Consider the balanced reaction: 2Cr3+(aq)+3PbO2(s)+6H2O(l)→2CrO42-(aq)+3Pb2+(aq)+4H3O+ (aq) a.Which species is the oxidizing agent b.What is the oxidation state of the O in CrO42- c.What is the oxidation state of the Pb in PbO2? d.How many valence electrons are in the CrO42- ion? e. How many moles of electrons, ne, are transferred per mole of this reaction? f. At a certain point the measured free energy is ∆?. Adding more PbO2 will cause the free energy change of the reaction, ∆G, to choose...(Increase, Stay the same, Decrease) g. At a certain point the measured ∆G is –5 kJ/mol. Lowering the pH will cause the free energy change of the reaction, ∆?, to choose... (become less negative, stay the same, become more negative) h. The reaction is used to set up an electrochemical cell. What is true about the cell if the measured voltage is negative? Choose ? < ?, ? = ?, ? > ?, Need more info I. At 298.2 K, this reaction has an equilibrium constant K = 1.6 × 1013 . What is the…
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eplain step by step
Sodium hydrogen sulfate is used as a cleaning agent and as a flux (a substancethat promotes the fusing of metals and prevents the formation of oxides). Oneof the ways in which sodium hydrogen sulfate is manufactured is by reactingsodium dichromate, Na2Cr2O7, with sulfuric acid. This process also forms waterand chromium(VI) oxide, CrO3.a. Write a balanced equation for this reaction. (You do not need to includestates.)b. How many kilograms of sodium dichromate, Na2Cr2O7, are necessary toproduce 130.4 kg of sodium hydrogen sulfate?c. How many kilograms of chromium(VI) oxide are formed when 130.4 kg ofsodium hydrogen sulfate is made?d. What is the minimum volume of 18.0 M H2SO4 solution necessary toreact with 874.0 kg of sodium dichromate?e. What is the maximum mass of sodium hydrogen sulfate, NaHSO4, thatcan be formed from the reaction of 874.0 kg of sodium dichromate with400.0 L of 18.0 M H2SO4?
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