Solubility Equilibrium FR worksheet - AP Solubility Equilibrium Free Response Questions page 1 1985 At 25C the solubility product constant Ksp for

Solubility Equilibrium FR worksheet - AP Solubility...

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AP* Solubility Equilibrium Free Response Questions page 1 (1) AP ® is a registered trademark of the College Board. The College Board was not involved in the production of and does not endorse this product. (2) Test Questions are Copyright © 1984-2008 by College Entrance Examination Board, Princeton, NJ. All rights reserved. For face-to-face teaching purposes, classroom teachers are permitted to reproduce the questions. Web or Mass distribution prohibited. 1985 At 25 ° C the solubility product constant, K sp , for strontium sulfate, SrSO 4 , is 7.6 × 10 7 . The solubility product constant for strontium fluoride, SrF 2 , is 7.9 × 10 10 . (a) What is the molar solubility of SrSO 4 in pure water at 25 ° C? (b) What is the molar solubility of SrF 2 in pure water at 25 ° C? (c) An aqueous solution of Sr(NO 3 ) 2 is added slowly to 1.0 liter of a well-stirred solution containing 0.020 mole F and 0.10 mole SO 4 2 at 25 ° C. (You may assume that the added Sr(NO 3 ) 2 solution does not materially affect the total volume of the system.) 1. Which salt precipitates first? 2. What is the concentration of strontium ion, Sr 2+ , in the solution when the first precipitate begins to form?
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