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Texas Woman University.... X C Chegg study Guided sol X Ga e a now to save a screen shot a apicture A pling /biscm 3145131 ming-com 3/29/2017 55 PM CA 383/100 G 3/22/2017 08:28 PM Gradebook o Assignment Information Attempts Score tr Print Calculator Periodic Table Available From: 3/3/2017 12:00 AM 95 Question 19 of 22 3/29/2017 11:55 PM Due Date: Map General Chemistry 4th Edition University Science Books Points Possible: presented by Sapling Leaming 100 Grade Category: Graded Sodium sulfate is slowty added to a solution containing 0.0500 M Ca2 (ag) and 0.0340 M Ag (ag). Description What wil be the concentration of Ca2 (ag) when Ag2soals) begins to precipitate? Solubility-product constants, Kop, can be found here. Policies: omework. Number You can check your answers. 13 Ca You can view solutions when you complete or give up on any questio What percentage of the Ca2 (aq) can be precipitated from the Ag (aq) by selective precipitation? You can keep trying to answer each question until 15 67 you get it right or give up. You lose 5% of the points available to each answer O Previous 8 Give Up & View solution check Answer O Next Exit in your question for each incorrect attempt at that 17 You will need to look up the KE2 values for silver sulfate and calcium sulfate. 18 95 First, find ISO 1using the IAg land the Kap for Ag2sos. O eTextbook O Help With This Topic OWeb Help & Videos 90 O Technical Support and Bug Reports 2011-2017 sapling Learning, Inc. about us careers partners privacy policy terms of use contact us help 4-40 PM Ask me anything 3/24/2017 R3

Explanation / Answer

Na2SO4 is added to Ca+2

Ca+2 + SO4-2 <--> CaSO4(s)

2Ag+ SO4-2 <-> Ag2SO4(s)

[Ca+2] = 0.05

[Ag+] = 0.034

find Ca+2 concentration when Ag+ precipitates:

First,

Ksp of Ag2SO4 = 1.2*10^-5

so

Ksp = [Ag+]^2[SO4-2]

1.2*10^-5 = (0.034^2)([SO4-2])

[SO4-2] = (1.2*10^-5) / (0.034^2)

[SO4-2] = 0.0103806 M will start precipitation

so

the [Ca+2] for tht:

Ksp = [Ca+2][SO4-2]

Ksp = 7.1*10^-5

[Ca+2] = M-x

[Ca+2] = 0.05-0.0103806 = 0.0396194 M of Ca+2

in %:

% CA+2 = (0.0396194)/0.05 * 100 = 79.2388 %

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