Chm142 exam - Study guides, Class notes & Summaries
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CHM142 Exam 1 Review with correct Solutions/Miami University
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What is the total concentration of ions (in mol/L) in a solution obtained by dissolving 3.51 g of Cr(NO3)3 in enough water to make 351 mL of solution? 
(Molar mass of Cr(NO3)3: 238.01 g/mol) - Ans: 0.168 +/- 1% 
 
What is the concentration of sodium ions (in mol/L) in a solution obtained by mixing 90.5 mL of 0.181 M solution of Na2SO4 and 65.5 mL of 0.147 M solution of Na3PO4? 
Assume that volumes are additive. - Ans: 0.395 
 
Which of the following molecules is polar? - Ans: IF5 
 
What is the ...
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CHM142 Exam 4 Review 2024/2025 with Correct Answers
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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)...
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CHM142 Exam 3 Review 2024/2025 With Correct Answers
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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...
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CHM142 Exam 3 Questions And Answers 2024 A+ Review
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CHM142 Exam 3 Questions And Answers 2024 A+ Review 
Buffer - ANS-Something that minimizes impact of the external force (in acid-base systems, force = pH) 
Acid-Base Buffer - ANS-A solution that will minimize changes in pH upon the addition of acid or base 
What is a buffer made of? - ANS-An acidic and a basic component - a conjugate acid-base pair (weak acid 
and conjugate base or weak base and conjugate acid) 
How do buffers work? - ANS-Through the common ion effect 
Common Ion Effect - ANS...
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CHM142 Exam 3 Questions And Answers 2024 A+ Review
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CHM142 Exam 3 Questions And Answers 2024 A+ Review 
Buffer - ANS-Something that minimizes impact of the external force (in acid-base systems, force = pH) 
Acid-Base Buffer - ANS-A solution that will minimize changes in pH upon the addition of acid or base 
What is a buffer made of? - ANS-An acidic and a basic component - a conjugate acid-base pair (weak acid 
and conjugate base or weak base and conjugate acid) 
How do buffers work? - ANS-Through the common ion effect 
Common Ion Effect - ANS-Oc...
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CHM142 Final Exam Review with correct solutions 2024/2025 University of Miami
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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...
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