Q5_S08_ans

Q5_S08_ans - Name__ A. Key____________ Dr. A. H. Martin...

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Unformatted text preview: Name__ A. Key____________ Dr. A. H. Martin Chem 113 Quiz 5A March 20, 2008 Dependent variables (x’s) must be defined for full credit. (1) 1. Write the dissociation equation and the K sp expression for silver chromate, Ag 2 CrO 4 . Ag 2 CrO 4 2 Ag 1+ + CrO 4 2- K sp = [Ag 1+ ] 2 [CrO 4 2- ] (4) 2. Calculate the molar solubility of CaF 2 for which the K sp = 3.9x10-11 . CaF 2 Ca 2+ + 2 F 1- K sp = [Ca 2+ ][F 1- ] 2 let x = molar solubility of CaF 2 + = + = - = - = K sp = [Ca 2+ ][F 1- ] 2 = (x)(2x) 2 = 3.9x10-11 4x 3 = 3.9x10-11 x 3 = 9.75x10-12 x = molar solubility = 2.13x10-4 (5) 3. Calculate the pH of a solution prepared by mixing 50 mL of 0.40 M HCl with 150 mL of 0.20 M CHCalculate the pH of a solution prepared by mixing 50 mL of 0....
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This note was uploaded on 04/03/2008 for the course CHEM 114 taught by Professor Martin during the Spring '08 term at Moravian.

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Q5_S08_ans - Name__ A. Key____________ Dr. A. H. Martin...

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