Question

having trouble with these.. please help and explain how you got this, already messed this up before, now maybe if i can get my homework understood, the re-test wont be so bad.

Identigy the conjugate acid/conjugate base pairs in this reaction HSO^-₃ (aq) + H₂CO_3­ (aq) € H­₂SO₃ (aq) + HCO^-₃(aq)

A H2SO3/SO3^2-, H2CO3/CO3^2-

B HSO3^-/H2SO3, H2CO3, H2SO4

C HSO3^-/H2CO3, H2SO3, HCO3^-

D HSO3^-/H2SO3, H2CO3/HCO3^-

E HSO3^-/HCO3^-, H2CO3/H2SO3

2. What is the [OH-] for a solution at 25deg C that has {H3O+]=2.35x10^-3 M? ( i got d and no credit i must have messed something up, or just explained it wrong???)

a. 2.35x10^-17

b. 4.26x10^-12

c. 2.35x10^-11

d. 4.26x10^-5

e. 5.52x10^-6

3. What is the pH of a 0.0040 M HNO3 solution?

a. 4.0

b. 2.87

c. 0.60

d. 2.40

e. 5.74

4. what is the pH of a 0.0100 M sodium benzoate solution, NaC6H5COO?

a. 8.10

b. 5.89

c. 3.10

d. 10.90

e. 9.82

5. What is the pK_b of a 0.450 M solution of hypoiodious acid, HOI?

a. 10,29

b. 10.64

c. 5.15

d. 3.36

e. 8.85

6. butyric acid is responsible for the odor in rancid butter. a solution of 0.25 M has a pH of 2.71. what is the Ka for the acid?

a. 1.5*10^-5

b. 2.4x10^-2

c. 3.8x10^-6

d. 2.0*10^-3

e. 7.8*10^-3

what is the pOH of a 0.050 M HBr solution?

a. 1.3

b. 1.12

c. 12.70

d. 11.00

e. 0.89

what is the pH of a 0.900 M soln of cyanic acid, HOCN

a. 12.2

b. 1.8

c. 3.5

d. 10.5

e. 4.6

what is the pH of a 0.879 M solution of phosphoric acid, H3PO4?

a. 3.64

7.28

1.09

2.18

0.06

a soln is prepared by adding 0.10 mol of potassium acetate, KCH3COO, to 1.00L of water. which is correct

the concentration of acetate ions will be greater than the concentration of potassium ions

the soln is neutral

the concntrations of potassium ions and acetate will be identical

soln is basic

soln is acidic

given the equation Ag2CO3 <----> 2 Ag+ (aq) + CO3^2-(AQ) what is the solubility broduct expression, Ksp of silver crbonate.

which of the following substances has the greatest solubility in water

ZnCO3

Ag2CO3

Cr(OH)3

AgCl

Mn(OH)2

What is the pH of a solution after titrating 50.0 mL of 0.650 M pyridine, C5H5N with 50.0 mL of 0.650 M HCL

4.47

2.71

5.74

2.87

5.43

A 10.0-mL sample of 0.75 M CH3CH2CO2H is titrated with 0.30 M NaOH. what is the pH of the solution after 22.0 mL of NaOH have been added to the acid.

4.89

5.00

5.75

4.12

2.50

what is the pH of a solution prepared with 0.50 M HC3H5O3(lactic acid) and 0.75 M NaC3H5O3(sodium lactate)?

.46

2.00

3.68

4.03

3.85

calculate the solubility of silver chromate, Ag2CrO4, in 0.005 M Na2CrO4

3.4x10^-5

1.0*10^-6

8.2*10^-5

5.2*10^-7

7.4*10^-6

if the solubility of barium fluoride is 7.2*10^-3 M what is the Ksp of BaF2?

7.5*10^-7

3.7*10^-7

7.2*10^-3

1.5*10^-6

5.2*10^-5

which of the following aqueous mixtures would be a buffer system?

Nh3,NaOH

H2SO4, CH3COOH

H4PO4, NaH2PO4

HCl, NaCl

HNO3, NaNO3

how many grams of NaOBr chould be added to 50.0 mL of 0.650 M HOBr to amke a buffer at pH=8.90

123

6.12

8.70

1.03

1.58