stoltzfus_chem123_Midterm1_page2

stoltzfus_chem123_Midterm1_page2 - 4(a 2.1 x 10-9 M(b 3.2 x...

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6. [7 points] A solution contains 0.015 M AsO 4 2- , 0.010 M I - , and 0.005 M CO 3 2- . If AgNO 3 is slowly added, in what order would the silver salts precipitate? For Ag 3 AsO 4 , K sp = 1.0 x 10 -22 For AgI, K sp = 8.3 x 10 -17 For Ag 2 CO 3 K sp = 8.1 x 10 -12 (a) 1 st : Ag 2 CO 3 2 nd : Ag 3 AsO 4 3 rd : AgI (b) 1 st : Ag 3 AsO 4 2 nd : Ag 2 CO 3 3 rd : AgI (c) 1 st : AgI 2 nd : Ag 3 AsO 4 3 rd : Ag 2 CO 3 (d) 1 st : AgI 2 nd : Ag 2 CO 3 3 rd : Ag 3 AsO 4 (e) 1 st : Ag 2 CO 3 2 nd : AgI 3 rd : Ag 3 AsO 4 7. [7 points] What is the concentration of free cobalt ion in 1.00 L of solution that is 5.25 x 10 -4 M in Co 2+ and 3.0 M in NH 3 ? K f Co(NH 3 ) 6 2+ = 8.3 x 10
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Unformatted text preview: 4 (a) 2.1 x 10-9 M (b) 3.2 x 10-4 M (c) 5.3 x 10-4 M (d) 8.7 x 10-12 M (e) 1.2 x 10-5 M 8. [7 points] The solubility of which of the following salts will be least sensitive to pH? (a) KClO 4 (b) BaF 2 (c) FePO 4 (d) NiCO 3 (e) The solubility of all four salts will be dramatically affected by pH. 9. [7 points] How many of the following reagents would increase the solubility of Ni(OH) 2 (s)? Ni(NO 3 ) 2 NaOH HCl NH 3 (a) none (b) one (c) two (d) three (e) all four...
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This note was uploaded on 09/15/2008 for the course CHEM 123 taught by Professor Larosa during the Spring '06 term at Ohio State.

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