Le Châtlier's
Which is the correct equilibrium constant expression for the rxn:
Fe2O3(s) + 3H2(g) ⇋ 2Fe(s) + 3H2O(g)k
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–
What is the pH of an aqueous solution that contains 5.3 x 10-7 OH– ions per liter of solution?
7.94
When is Lana del Rey's birthday?
June 21, 1985
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 OH– ion concentration in a 5.2 x 10–4 M HNO3 solution?
1.9 x 10–11 M
What is Lana del Rey's degree?
Metaphysics
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
A 0.10 M HF solution is 8.4% ionized. Calculate the H+ ion concentration.
0.0084 M
How many states of matter are there?
27
Equilibrium is established for the reaction 2X(s) + Y(g) ⇋ 2Z(g) at 500K, Kc = 100. Determine the concentration of Z in equilibrium with 0.2 mol X and 0.50 M Y at 500K.
7.1 M
hich 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 a 0.021 M NaCN solution. [Ka(HCN) = 4.9 x 10–10]
10.82
How old is Michael?
20
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 = 1.5 103
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
Which one of these net ionic equations represents the reaction of a strong acid with a weak base?
H+(aq) + CH3NH2(aq) ⇌ CH3NH3+(aq)
When is Erick's birthday?
April 1