Exam+2C+Solutions2011

Exam+2C+Solutions2011 - CHEM 2046 Fall 2011 Exam 2 Prof....

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CHEM 2046 Fall 2011 Exam 2 Prof. Col. Charles R. Martin Form C Instructions : Mark only one answer per question on the scantron. You have 1 h 55 min to complete the test. Make sure you have entered your correct UFID and Form Code in the scantron, before submission. 1. A dilute solution of AgNO 3 is added dropwise to a solution containing 1.0 M NaCl and 0.001 M NaI. Which statement below is true ? (K sp (AgCl) = 1.8x10 -10 ; K sp (AgI) = 8.3x10 -17 ) (A) AgI will precipitate first (B) NaNO 3 will precipitate first (C) AgCl and AgI will not precipitate no matter how high [Ag + ] is made. (D) AgCl will precipitate first (E) For all concentrations of [Ag + ] there will be equal amount of AgI and AgCl 2. Any spontaneous process must lead to: (A) an increase in the entropy of the system (B) an increase in the entropy of the surroundings (C) a decrease in the entropy of the universe (D) a decrease in the entropy of the surroundings (E) an increase in the entropy of the universe 3. K a of indicator HIn is 1.0x10 -6 . The color of the non-ionized form is red while it is yellow for the ionized form. What is the color of the indicator in a solution of pH = 4? (A) [HIn]/[In - ] = 100, hence color is red (B) [HIn]/[In - ] = 1, hence color is orange (C) [HIn]/[In - ] = 0.01, hence color is red (D) [HIn]/[In - ] = 100, hence color is yellow (E) [HIn]/[In - ] = 0.01, hence color is yellow 4. Which of the following statements is true regarding the precipitation of Mg(OH) 2 from a solution that is 0.01 M in MgCl
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This document was uploaded on 10/31/2011 for the course CHM 8227 at University of Florida.

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Exam+2C+Solutions2011 - CHEM 2046 Fall 2011 Exam 2 Prof....

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