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27 Cards in this Set
- Front
- Back
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what does keq>1 mean
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favors products
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what does keq < 1 mean
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favors reactants
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what is the equation for keq
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[C]^c [D]^d /
[A]^a [B]^b |
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define an acid
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proton or electron donors
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what is the water dissociation equation
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H2O + H2O = H3O+ + OH-
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what is the acid dissociation equation
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HA = H+ + A-
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ka=
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[H+][A-]/
[HA] |
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draw acetic acid
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CH3COOH
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HSO4- is ____ because it may either accept or donate a proton
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amphoteric
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how many amphoteric species are in a triprotic acid
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two
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CH3COOH + NaOH --> CH2COO- NA+ + H2O is an example of what type of equation
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neutralization
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what is the basic dissociation equation
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A- + H2O --> HA + OH-
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kb =
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[HA][OH-]/
[A-] |
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if pH < pKa what happens to the acid
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protonates
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what if pH = pKa
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[A-] = [HA]
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what if pH > pKa
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deprotonates
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when do you use an ice box
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when AcOH is added
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pH = pKa at how many equivalents
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.5
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pka/2 is at what equivalents
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0 or at any whole number
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how do you choose a buffer
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pick soemthing with Pka near desired pH
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how do you determine the last pka in a triprotic acid
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14-pka
14- pkb/2 |
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how do you find the pH at the equivalence points
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average of pkas/2
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estimate the pH of acetic acid 5M with Pka=4.76
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pka/2 = 2.3
max = 2.3 min = 1.3 |
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estimate pOH of 3M acetate pKa=4.76
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14- 4.76 = 9.25
pkb/2 = 4.15 max 3.15 min |
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as [OH-] increases what happens to pOH
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decreases
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in general, the log of a decimal =
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negative number
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find pH of 1:10 lactic acid: acetate if pka = 3.86
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4.86
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