History Bookmarks Develop Window Help De 53%\") Sat Nov 18 9:38 041 saplinglearn

Question

History Bookmarks Develop Window Help De 53%") Sat Nov 18 9:38 041 saplinglearning.com Apple ICloud Yahoo Bing Google Wikipeda Google Yahoo University of Callanna-Merced-Che"INCLUSIV E ACCESS)-Fal17 ROBLEDO: Focus Jump to... Fernando Le- Resources 11/20/2017 11:55 PM0/100 Gradebook O Assignment Infe Available From: Due Date: Points Possible: 1 General Chemistry University Science Books Sodium suifate is slowly added to s solution containing 0 0500 M Ca (a) and o.0380 M Ag(ag) What wil be the concentration of Ca(aqi when AgSo(s) begins to preoiptate? Soubility-product constanes, Kg, can be found here. Grade Category G Description: Policies: You can check your ar You can view solutions give up on any questic You can keep trying to until you get ik right o You lose 5% of the por answer in your questio actemmpt at that answer What percentage of the Ca? (ac) can be preciptated from the Ag'(a) by selective precipitation? O eTextbook O Help With This Tep O Web Heip & Videos O Technical Support ar g0 889

Explanation / Answer

At first we calculate the [SO42-] at which Ag2SO4 first begins to precipitate,

Ag2SO4 <----> 2 Ag+ + SO42-
Ksp = 1.2 x 10-5 = [Ag+]2[SO42-]

=> 1.2 x 10-5 = (0.0380)2[SO42-]

=> [SO42-] = 1.2 x 10-5 / 0.001444 = 831 x 10-5 = 8.31 x 10-3 M

Now, to get to the [Ca2+] at this point, we must know the Ksp for CaSO4.

Ksp = [Ca2+][SO42-] = 4.9 x 10-5

=> 4.9 x 10-5 = [Ca2+](8.31 x 10-3)

=>[Ca2+] = 5.89 x 10-3 M

So, [Ca2+] has gone from 0.0500M to 5.89 x 10-3 M
% precipitated Ca2+(aq) = [(0.0500 -5.89 x 10-3 ) / 0.0500] x 100 % = 0.8822 x 100 % = 88.22 %

Related Questions

Navigate

• Browse (All)
• Browse H
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.