103B PS 5 - problem set 1 Page 1 CHEMISTRY 103B Sections 1-4 Problem Set 5 17 Points Answer Key Problem1(ten points Your job is to assistthe

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Page 1 problem set 1 4/10/2008 12:16:32 AM http://www.chem.arizona.edu/~kellerp/ps-answers/PS5an/PS5an.htm CHEMISTRY 103B, Sections 1-4 Problem Set 5: 17 Points Answer Key Problem1. (ten points) Your job isto assistthe scienceofficerby usingthe pH data to matcheach labelwiththe correct solution . . InformationFoundon Label Solution pH Sodiumnitrate, 0.0030 mol/L Nitrate ion is the conjugate base of a strong acid and is therefore not a base. The solution will be neutral. E 7.00 Ammoniumchloride , 0.50 mol/L Ammonium ion is a weak acid with Ka 5.7e-10. For a 0.50 M solution, the hydrogen ion concentration calculates to 1.7e-5 M and a pH of 4.78 F 4.78 Potassiumhydroxide0.0070 mol/L KOH is an ionic hydroxide. The concentration of hydroxide ion is therefore 0.0070 M. This gives a pOH of 2.15 and a corresponding pH of 11.85. B 11.85 Hydrochloricacid, 1.5 mol/L HCl(aq) is a strong acid. The hydronium ion concentration will be 1.5 M making the pH -0.18 (yes, negative). J
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This note was uploaded on 04/10/2008 for the course CHEM 103B taught by Professor Keller during the Spring '08 term at University of Arizona- Tucson.

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103B PS 5 - problem set 1 Page 1 CHEMISTRY 103B Sections 1-4 Problem Set 5 17 Points Answer Key Problem1(ten points Your job is to assistthe

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