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6-19. A solution contains 0.050 0 M Ca2+ and 0.030 0 M Ag+. Can 99% of Ca2+ be precipitated by sulfate without precipitating

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Answer #1

Ksp of Ag2SO4 = 1.20×10-5 = [Ag+]2[SO42-]

[SO42-] = 1.20×10-5/(0.0300)2 = 0.0133M

Ksp of CaSO4 = 4.93×10-5

Concentration of Ca2+ , when silver sulphate begin to ppt = 4.93×10-5/0.01333 = 0.0036975 M

= 0.00370M. (Answer)

% of Ca2+ left before silver sulphate begins to ppt = (0.0036975/0.0500 )×100 % = 7.395%

= 7.4%

99% of Ca2+ will not be precipitated before silver sulphate start to precipitate. (Answer)

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