Kw, Ka and Kb
Authored by Claire Safwan
Chemistry
11th Grade
NGSS covered
Used 37+ times
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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How would you calculate Kb for the formate ion (HCOO–), given that the Ka for formic acid (HCOOH) is 1.8 × 10–4? (Kw=1.0 × 10–14)
Kb = Ka × Kw
Kb = Kw / Ka
Kb = Ka / Kw
Kb = Kw + Ka
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The magnitude of Kw indicates that ______________.
water autoionizes very slowly
water autoionizes very quickly
water autoionizes only to a very small extent
the autoionization of water is exothermic
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In which of the following aqueous solutions does the weak acid exhibit the highest percentge of ionization?
.01 M HC2H3O2 . (Ka 1.8 x 10 -5)
.01 M HNO2 . ( Ka =4.5 x 10 -4)
.01 M HClO . (Ka= 3.0 x 10 -8)
.01 M HF (Ka= 6.8 x 10 -4)
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Of the following, which is the strongest acid
HClO
HClO2
HClO3
HClO4
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
HA is a weak acid. Which equilibrium corresponds to the equilibrium constant Kb for A-?
HA (aq) + H2O (l) <---> H2A+ (aq) + OH-(aq)
A- (aq) + H3O+ (aq) <---> HA (aq) + H2O (l)
HA (aq) + OH- (aq) <---> H2O (l) + H+ (aq)
A- (aq) + H2O (l) <---> HA (aq) + OH- (aq)
A- (aq) + OH- (aq) <---> HOA2- (aq)
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the conjugate base of HClO4?
H+
Cl-
ClO3-
ClO4-
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the closest pH to a solution with a [H+] = 2.5 x 10-10?
2.5
3.0
4
9
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