Chm142 exam 3 review - Study guides, Class notes & Summaries
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CHM142 Exam 3 Review 2024/2025 With Correct Answers
- Exam (elaborations) • 14 pages • 2024
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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
- Exam (elaborations) • 11 pages • 2024
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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
- Exam (elaborations) • 11 pages • 2024
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- $13.49
- + learn more
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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