Equillibrium
Which is the correct equilibrium constant expression for the rxn:
Fe2O3(s) + 3H2(g) ⇋ 2Fe(s) + 3H2O(g)
Kc = [H2O]^3 / [H2]^3
Calculate the hydrogen ion concentration in a solution of iced tea with lemon having a pH of 2.87.
1.3*10^-3
Acid strength increases in the series: HCN < HF < HSO4–. Which of these species is the strongest base?
CN–
A 150. mL solution of nitrous acid (Ka = 4.5 x 10 – 4 ) is titrated with a solution of 2.00 M KOH. The equivalence point is reached when 86.0 mL of the base has been added. Determine the pH of the solution during the titration when 43.0 mL of base had been added.
3.35
If pka=-log(ka) and pkb=-log(kb), what is pDiddy?
-log(Diddy)
Calculate Kp for the reaction 2NOCl(g) ⇋ 2NO(g) + Cl2(g) at 400°C if Kc at 400°C for this reaction is 2.1 x 10–2
1.2
Acid strength decreases in the series HI > HSO4– > HF > HCN. Which of these species is the weakest base?
I–
Acid dissociation constants for phosphoric acid are given. Predict the direction in which the equilibrium will lie for the reaction
Ka1 = 7.5 x 10^-3
Ka2 =6.2 x 10^-8
Ka3 = 4.8 x 10^-13
HPO4 –2 (aq) + ClO –(aq) --> PO4 –3(aq) + HClO (aq)
reactants will be favored
What is the net ionic equation for the reaction that occurs when small amounts of hydrochloric acid are added to a HNO2 / NaNO2 buffer solution?
A)H+ +H2O⇌H3O+
B) H+ + HNO2 ⇌ H2NO2+
C) Cl - + NO ⇌ ClNO -
D)HCl+HNO2 ⇌H2O+ClNO
E) None of these
None/ H+ + NO2- = HNO2
Who was in Paris?
Paris the Peer Leader
Consider the two gaseous equilibria
2SO2(g) + O2(g) → 2SO3(g) K1
2SO3(g) →2 SO2(g) + O2(g) K2
The values of the equilibrium constants K1 and K2 are related by
K2 = 1/K1
Identify the conjugate base of HPO42– in the reaction
HCO3– + HPO42– -> H2CO3 + PO43–
PO4 3–
A 0.14 M HNO2 solution is 5.7% ionized. Calculate the H+ ion concentration.
8.0 x10–3 M
In which one of the following solutions will acetic acid have the greatest percent ionization?
A) 0.1 M CH3COOH
B) 0.1 M CH3COOH dissolved in 1.0 M HCl
C) 0.1 M CH3COOH plus 0.1 M CH3COONa
D) 0.1 M CH3COOH plus 0.2 M CH3COONa
0.1 M CH3COOH
Who created the national anthem?
Lana del Rey
Equilibrium is established for the reaction 2X(s) + Y(g) ⇋ 2Z(g) at 500K, Kc = 1*10^-4. Determine the concentration of Z in equilibrium with 0.2 mol X and 0.50 M Y at 500K.
.0142 M
Which of the following yields an acidic solution when dissolved in water?
A) HNO2 B) LiOH C) KClO2 D) NaCl E) Ca(OH)2
HNO2
Which one of these statements about strong acids is true?
A) All strong acids have H atoms bonded to electronegative oxygen atoms.
B) Strong acids are 100% ionized in water.
C) The conjugate base of a strong acid is itself a strong base.
D) Strong acids are very concentrated acids.
E) Strong acids produce solutions with a higher pH than weak acids ;p
Strong acids are 100% ionized in water
Calculate the pH of the solution resulting from the addition of 10.0 mL of 0.10 M NaOH to 50.0 mL of 0.10 M HCN (Ka = 4.9 ́ 10–10) solution.
A) 5.15
B) 8.70
C) 5.85
D) 9.91
E) 13.0
8.7
Public speaking
The following reactions occur at 500 K. Arrange them in order of increasing tendency to proceed to completion (least completion to greatest completion).
1)2NOCl→2NO+Cl2 Kp =1.7*10^–2
2) N2O4 → 2NO2 Kp = 1.5*10^3
3)2SO3 → 2SO2 +O2 Kp =1.3*10^–5
4)2NO2 → 2NO+O2 Kp =5.9*10^-5
3,4,1,2
List strong acids and strong bases.
HCl, HBr, HI, HNO3, HClO3, HCLO4, H2SO4
LiOH, NaOH, KOH, RbOH, CsOH, Sr(OH)2, Ba(OH)2
Diet cola drinks have a pH of about 3.0, while milk has a pH of about 7.0. How many times greater is the H3O+ concentration in diet cola than in milk?
10,000 times higher in diet cola than in milk
What is the ratio of ammonia and ammonium chloride needed to get a solution with a pH of 9.00? (Kb = 1.8 x 10-5)
.6:1
What's my favorite yearning song?
The one that got away by Katy Perry