CHM142 (CHM142)

CHM142 Final Exam Review with correct solutions 2024/2025 University of Miami Last document update:   ago

The standard reduction potential for the half-reaction HClO(aq) + H+(aq) + e- → ½Cl2(g) + H2O(l) is 1.61 V. What is the standard reduction potential for the following half-reaction? 2HClO(aq) + 2H+(aq) + 2e- → Cl2(g) + 2H2O(l) - Ans: 1.61 V Given that Eºcell = 0.60 V for a voltaic cell in which the following redox reaction takes place 2Rh(s) + 3Cl2(g) → 2Rh3+(aq) + 6Cl-(aq) and that the standard reduction potential for the half-reaction Cl2(g) + 2e- → 2Cl-(aq) is 1.36 V, calcul...

CHM142 Exam 4 Review 2024/2025 with Correct Answers Last document update:   ago

Which of the following titrations will result in a noticeably basic solution at the equivalence point? KOH(aq) + HI(aq) HCl(aq) + NaOH(aq) CH3COOH(aq) + NaOH(aq) NH3(aq) + HClO4(aq) NaHCO3(aq) + HCl(aq) - Ans: CH3COOH(aq) + NaOH(aq) Which of the following indicators is suitable for the titration of 0.10 M CH3COOH (Ka = 1.8 x 10-5) with 0.15 M NaOH? methyl orange (Ka = 2.0 x 10-4) phenolphthalein (Ka = 4.0 x 10-10) bromocresol green (Ka = 2.0 x 10-5) bromothymol blue (Ka = 1.0 x 10-7)...

CHM142 Exam 3 Review 2024/2025 With Correct Answers Last document update:   ago

Given the pKa's of several polyprotic acids choose the strongest acid among the ions given below. H3PO4: pKa1=2.16, pKa2=7.19, pKa3=12.32 H3AsO4: pKa1=2.26, pKa2=6.77, pKa3=11.29 H2SO3: pKa1=1.77, pKa2=7.21 H2CO3: pKa1=6.37, pKa2=10.33 > HCO3- > H2AsO4- > H2PO4- > HPO42- > HSO3- - Ans: H2AsO4- Which of the following is the weakest base? > (CH3CH2)2NH (pKb = 3.07) > NH2OH (pKb = 7.97) > (CH3CH2)3N (pKb = 3.25) > CH3CH2NH2 (pKb = 3.25) > (CH3)3N (p...