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 |