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Unformatted text preview: involving entropy of a gas. (b) Solid strontium hydroxide is added to a solution of nitric acid. (i) Balanced equation: Sr(OH)2 + 2 H+ → Sr2+ + 2 H2O One point is earned for the correct reactants. Two points are earned for the correct products. One point is earned for balancing the equation for mass and charge. (ii) How many moles of strontium hydroxide would react completely with 500. mL of 0.40 M nitric acid? There is 0.20 mol of H+ in 500. mL of 0.40 M nitric acid. Because there are two moles of OH− in each mole of Sr(OH)2 , 0.10 mol of Sr(OH)2 is needed to react completely. One point is earned for the correct answer. © 2008 The College Board. All rights reserved. Visit the College Board on the Web: www.collegeboard.com. AP® CHEMISTRY 2008 SCORING GUIDELINES (Form B)
Question 4 (continued)
(c) A solution of barium chloride is added drop by drop to a solution of sodium carbonate, causing a precipitate to form. (i) Balanced equation: Ba2+ + CO32− → BaCO3 One point is earned for the correct reactants. Two poi...
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This note was uploaded on 05/05/2011 for the course CHEM 504 taught by Professor John during the Fall '11 term at American College of Computer & Information Sciences.
- Fall '11