Page 1Exam I master4/10/2008 12:21:35 AMhttp://www.chem.arizona.edu/~kellerp/exams/Exam2/exam2Dan/Exam2Dan.htmChemistry 103B Exam 2 FormDAnswer Key1. (2) Which acid/conjugate base pair would be best for making a buffer solution with pH = 3.00?(a) H3PO4/H2PO4-(b) HCO3‐/CO32-(c) H2CO3/HCO3-(d) HCN/CN-(e) CH3OH/CH3O-Essentially from the d2l practice test.2. (2) Lead(II) iodide, PbI2(s), has Ksp= 7.9 x10-9. What is the concentration of iodide ion, I-(aq), in asaturated solution of PbI2?(a) 1.3e-3 M(b) 2.5e-3 M(c) 2.0e-3 M(d) 6.3e-5 M(e) 1.3e-4 MFrom the study outline : " Computation of the equilibrium concentrations of ions in a saturatedsolution of an ionic compound ."3. (2) A water solution has a pOH of 0.00. This means:(a) The solutionis neutral.(b) the hydroxideion concentrationis 1.00 mol/L(c) There is nohydronium ionpresent .(d) There is nohydroxide ionpresent .(e) none ofthese .Definition of pOH4. (2) What is the pH of a buffer solution that consistes of 0.10 M HCO3-(aq) and 0.95 M CO3-2(aq)?From the study outline : "Be able to calculate the pH or hydrogen ion concentration of a buffer solution
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