Acid Base Chemistry:
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Today:
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Arrhenius Definition
Brønsted-Lowry Definition
Strong Acids & Strong Bases
Weak Acids & Weak Bases
pH scale:
 Logarithms
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Next Meeting
◦ Please read Chapter 14, pp. 496511 before Thursday
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QUIZ 4 during Lab: Covers
Lectures 21 & 22 on solutions,
concentration, dilution &
solution stoichiometry
Concept Check:
Solution Stoichometry
A.
100 mL of 5 M NaOH is mixed with 50 mL of 10 M H2SO4.
Which component is the limiting reagent?
2 NaOH(aq) + H2SO4(aq) → 2 H2O(l) + Na2SO4(aq)
NaOH
B. H2SO4
C. H2O
D. There is no limiting reagent
E. Cannot Determine from Information provided
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Arrhenius Definition
Bronsted-Lowry Definition
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Measuring Acidity with the pH Scale
Logarithmic pH scale: pH = -log[H+]
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pH = -log[H+]
Strong Acids
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Strong Acids versus Weak Acids
iClicker Participation Question
Strengths of Weak Acids
Which is the weakest acid?
A.
B.
C.
D. They all equally strong
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Weak Acids: Only Partially Dissociate
Weak Acids: Only Partially Dissociate
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Strong Bases: Fully Dissociate in Solution
Weak Bases
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iClicker Participation Question
pH and Acid Strength
Which solution would have the lowest pH?
A. 0.1 M CH3CO2H(aq) (Acetic Acid)
B. 0.1 M HCl(aq)
C. 0.1 M NH3(aq)
D. They would all have the same pH
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