25. Answer the following questions in order to find the conditions under which Cd2+ and Zn2+ can, in theory, be separated quantitatively with H2S from a solution that is 0.1 M in each cation. (We consider a precipitation to be quantitative when all but 1 part in 1000 of the ion has been removed from the solution.) Ksp for ZnS = 1,2x10^-23 Ksp for CdS = 1,08x10^-28 K1 = 9.6 x 10^-8 K2 = 1.3 x 10^-14 Find the [H30+] to start precipitation of Zn2+ cations?

Chemistry by OpenStax (2015-05-04)
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Author:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
Publisher:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
Chapter15: Equilibria Of Other Reaction Classes
Section: Chapter Questions
Problem 115E: A volume of 50 mL of 1.8 M NH3 is mixed with an equal volume of a solution containing 0.95 g of...
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25. Answer the following questions in
order to find the conditions under which
Cd2+ and Zn2+ can, in theory, be
separated quantitatively with H2S from a
solution that is 0.1 M in each cation. (We
consider a precipitation to be quantitative
when all but 1 part in 1000 of the ion has
been removed from the solution.)
Ksp for ZnS = 1,2x10^-23
Ksp for CdS = 1,08x10^-28
K1 = 9.6 x 10^-8
K2 = 1.3 x 10^-14
Find the [H30+] to start precipitation of
Zn2+ cations?
Transcribed Image Text:25. Answer the following questions in order to find the conditions under which Cd2+ and Zn2+ can, in theory, be separated quantitatively with H2S from a solution that is 0.1 M in each cation. (We consider a precipitation to be quantitative when all but 1 part in 1000 of the ion has been removed from the solution.) Ksp for ZnS = 1,2x10^-23 Ksp for CdS = 1,08x10^-28 K1 = 9.6 x 10^-8 K2 = 1.3 x 10^-14 Find the [H30+] to start precipitation of Zn2+ cations?
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