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A buffer sol'n consists of
- - Weak acid + its weak conjugate base salt
- - Weak base + its weak conjugate acid + H20
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Explain the buffer sol'n in action
Adding protons will react with CB. Adding OH ions will react with weak acid (to form water)
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What two things does the buffer capacity depend on
- 1. The close the pH of the buffer to the pKa of the weak acid, the great buffer capacity it has
- 2. The greater the concentration of the weak acid and its conjugate base, the greater the buffer capacity
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When you increase the concentration of protons, what happens
pH goes down
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A buffered sol'n is used to
Resist change in pH. (No buildup of protons when SA is added, and -OH ions remove protons from SB- no change in pH)
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Write the CB of acetic acid (CH3COOH)
CH3COO-
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Which strength level is most likely to go to equilibrium
Weak
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What is the conjugate base of HCl
Cl-. When HCl is added to water, it is deprotonated, the rxn goes to completion.
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To maintain the pH of blood, which buffer systems are used
- 1. carbonate
- 2. phosphate
- 3. proteins
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What is the average pH of human blood
7.4
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Arrhenius definitions for an acid and a base
- -Acid- H+ ions in aq sol'n.
- -Base- -OH ions in aq sol'n
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Bronsted definitions for an acid and a baes
- -Acid- Proton donor
- -Base- Proton acceptor
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A weak acid has a (large, small) Ka
Small (Kaiser is weak and small)
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If a weak acid has a small Ka, it has a (large, small) pKa
Large
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