Chemistry III – Flashcards

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Dynamic equilibrium
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rates of
the forward and reverse reaction rates are equal
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larger the k value the ________ product at equilibrium
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more product
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concentration of reactions at equilibrium
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not equal
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Keq >> 1
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equilibrium favors products
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Keq << 1
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equilibrium favors reactants
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K backward =
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1/ K forward
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Q > K
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fastest in the reverse direction,the [products] will decrease and [reactants] will increase
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Q < K
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fastest in forward direction, the [products] will increase and [reactants] will decrease
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Q = K
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reaction is at equilibrium
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Properties of acids
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sour
reacts with active metals
corrosive
litmus blue turns to red
reacts with carbonates
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Binary acids
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acid hydrogens attached
to a nonmetal atom
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Oxy acids
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acid hydrogens attached to
an oxygen atom
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Carboxylic acids
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have COOH group
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Properties of Bases
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bitter
red litmus turns blue
known as alkalis
Solutions feel slippery
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Indicators
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change color depending on acidity or basicity,litmus, Phenolphthalein
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Arrhenius Base
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dissociate in water to produce OH? ions
and cations
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Arrhenius Acid
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ionize in water to produce H+ ions and
anions
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Arrhenius Acid–Base Reactions
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acid + base > salt + water
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Bronsted-Lowry Acid
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acid is an H donor
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Bronsted-Lowry Base
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base is an H acceptor
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Amphoteric
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can act as an acid or a base (water)
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Conjugate acid has one ________ proton
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has one more proton (hydrogen)
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strong acid or base is a ________ electrolyte
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strong, and vise versa
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larger Ka = ________ acid
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stronger
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pH formula
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pH = -log[H3O+], to get [H3O+] 10^-(pH)
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autoionization
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atoms and molecules spontaneously emit a valence electrons
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Dissociation Constant of Water
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Ion Product of Water: [H3O+] x [OH–] = Kw = 1.00 x 10^?14 @ 25 °C
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pOH formula
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pOH = ?log[OH?], [OH?] = 10^?pOH
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pH+ pOH =
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14.00
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strength of an acid or
base formula
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pKa = -log(Ka), Ka = 10^-pKa
pKb = -log(Kb), Kb = 10^-pKb
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stronger the acid the _________ pKa
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smaller
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larger Ka = ________ pKa
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smaller
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polyprotic acids
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more than one ionizable H-, stronger than monoprotic acids
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Percent Ionization =
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(molarity of ionized acid / initial molarity) * 100
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Salts
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water-soluble
can be acidic or basic
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anion
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conjugate
base of an acid
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stronger the acid, the _________ the conjugate base
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weaker the
conjugate base
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higher electronegativity = _________ acidity
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higher acidity, increases right and down periodic table
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Lewis Acid Base theory
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focuses on transferring
an electron pair
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Lewis Base
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electron donor
electron rich, therefore nucleophile
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Lewis Acid
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electron acceptor
electron deficient, therefore electrophile
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acid rain
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pH less than 5.6, corrodes carbonate (bridges, cement, marble, limestone)
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danger of antifreeze
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contains ethylene glycol which is turned into glycolic acid by liver, lowers blood pH causes acidosis
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buffers
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resist changes in pH when an acid or base is added
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Making an Acid Buffer
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weak acid mixed with solution of soluble salt containing conjugate base anion
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common ion
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conjugate base of the acid
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Relationship between pKa and pKb
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?log(Ka) + ?log(Kb) = 14
pKa + pKb = 14
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Henderson-Hasselbalch Equation
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pH=pKa+log(A-/HA)
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buffering capacity
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amount of acid or
base a buffer can neutralize
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buffering range
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pH range the buffer can
be effective
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effectiveness of a buffer depends on
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1. relative amounts of acid and base
2. absolute concentrations of acid and base
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buffers will work when
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0.1 < [base]:[acid] < 10
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buffers most effective when there are
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equal concentrations of acid and base
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titration
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a solution of unknown concentration
(titrant) is slowly added to a solution of known concentration
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the equivalence point
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inflection point of the curve
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solubility product, Ksp
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constant of dissociation of a
solid salt into its aqueous ions
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molar solubility
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number of moles of
solute that will dissolve in a liter of solution
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complex ions
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Ions that form by combining a cation with several anions or neutral molecules
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ligands: the (H2O) in Ag(H2O)2
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attached ions or molecules of complex ions
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conjugate base has one _______ hydrogen
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has one less proton (hydrogen)
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Ka x Kb =
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kw = 1*10^-14
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What is the difference between a strong and weak acid
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strong acid completely ionizes where a weak one partially ionizes
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what is the autoionization of water?
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water acts as an acid and a base with itself
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Do both protons ionize instantaneously from a diprotic acid such as H2CO3
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No polyprotic acids ionize in successive steps, the lst proton easily separates from the nuetral atom while the next protons have difficulty in separating from the anions
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Describe the relationship between molecular structure and acid strength
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The stronger the bonds the weaker the acid, the greater the electronegativity & polarity the stronger the acid
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compound that is in antifreeze and is toxic to pets
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ethylene glycol
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Sketch the titration curve for a strong acid titrated with a strong bas
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[image]
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Identify the compound that is in stalactites and stalagmites
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Calcium carbonate
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