In acid/base equilibrium, both RxN moving forward (right) and backward (left) involves ____ transfer.
#38) what happens when a strong acid such as HBr is dissolved in water?
in water, HBr dissociates almost completely. water acts as a base to accept a proton, and a solution of H3O+ and Br- results
#40) what happens when a strong base such as KOH is dissolved in water?
in water, KOH dissociates completely to yield K+ and OH- ions.
#42) what is the difference b/w a monoprotic acid and a diprotic acid? example?
a monoprotic acid, such as HCl, has only one proton to donate, whereas a diprotic acid, such as H2SO4, has 2 protons to donate.
#44) which of the following are strong acids?
a) HClO4 b) H2CO3 c) H3PO4
d)NH4+ e) HI f)H2PO4
strong acids: a, e
#46) identify the following substances as a bronsted/Lowry base, a bron./Low. acid, or neither:
a) HCN b) CH3CO2- c) AlCl3
d)H2CO3 e) Mg2+ f) CH3NH3+
BL acids: a, d, f,
BL base: b
neither: c, e,
#48) write the formulas of the conjugate acids of the following bronsted/Lowry bases:
a)ClCH2CO2- b)C5H5N c) SeO42-
a) ClCH2CO2H b) C5H5NH+ c) HSeO4 d)(CH3)3NH+
#50) the hydrogen containing anions of many polyprotic acids are amphoteric. Write equations for HCO3- and H2PO4- acting as bases w/ the strong acid HCl and as acids w/ the strong base NaOH.
#52. Sodium bicarbonate (NaHCO3) A.K.A. baking soda, is a common home remedy for acid indigestion and is also used to neutralize acid spill in the laboratory. write a balanced chemical equation for the reaction of sodium bicaronate w/ a) HCl b) H2SO4
#56. How is Kw defined, and what is its numerical value at 25 celius?
#58. a solution of 0.10 M HCl has a pH = 1.00, whereas a solution of 0.10 M CH3COOH has a pH = 2.88. why?
#60. Write the expressions for the acid dissociation constants for the successive dissociation of phosphoric acid, H3PO4 in water.
#62. the electrode of a pH meter is placed in a sample of urine, and a reading of 7.9 is obtained. is the sample acidic, basic, or neutral? what is the concentration of H3O+ in the urine sample?
#66. what is the approximate pH of a 0.02 M solution of a strong monoprotic acid? Of a 0.02 M solution of a strong base, such as KOH?
#68 match the H3O+ concentrations of the following:
a) [H3O+] =2.5 X 10-8 M
b) " " = 5.0 X 10-4 M
c) " " =2.3 X 10-12 M
d) " " = 4.0 X 10 -3 M
#70. what are the H3O+ and OH- concentrations of solutions that have the following pH values?
a) pH 4 b) pH 11 c) pH 0 d) pH 1.38 e) pH 7.96
#74. The pH of buffer solution containing 0.10 M acetic acid and 0.10 M sodium acetate is 4.74.