1. Which ion is the strongest base? A) Br– B) NO3–C) I– D) F– 2 HCl (aq) is an e
ID: 892996 • Letter: 1
Question
1.
Which ion is the strongest base?
A) Br– B) NO3–C) I– D) F–
2
HCl (aq) is an example of a
A) weak base. B) strong base. C) weak acid. D) strong acid.
3
Which species can be a Brønsted–Lowry acid?
A) HCO3– B) HI C) NaBr D) LiOH
4
The [–OH] in a solution is 1.7 × 10–11 M. What is the [H3O+] in this wine?
A)
5.9 × 10–4 M
D)
1.7 × 10–11 M
B)
1.0 × 10–7 M
E)
1.0 × 10–14 M
C)
5.9 × 10–18 M
5
What is the pH of a cleaning solution with a [H3O+] = 7.4 × 10–9 M H3O+?
A) 6.9 B) 9.1
C) 4.87 D) 8.13
6
What is the balanced equation for the acid–base reaction of nitrous acid with lithium hydroxide?
A)
LiOH(aq) + HNO2(aq) ---> H2O(l) + LiNO2(aq)
B)
Li(OH)2(aq) + 2 HNO3(aq) ---> 2 H2O(l) + Li(NO3)2(aq)
C)
LiOH(aq) + HNO3(aq) ---> H2O(l) + LiNO3(aq)
D)
2 LiOH(aq) + H2NO2(aq) ---> 2 H2O(l) + Li2NO2(aq)
Explanation / Answer
1.Which ion is the strongest base?
A) Br– B) NO3– C) I– D) F–
Answer:
the stronger base is one which is conjugate base of weak acid so answer is F-
2 HCl (aq) is an example of a
A) weak base. B) strong base. C) weak acid. D) strong acid.
Answer: it shows high degree of dissociation into H+ and Cl- so it is a strong acid
3Which species can be a Brønsted–Lowry acid?
A) HCO3– B) HI C) NaBr D) LiOH
Answer: Bronsted lowry acid is the one which can give H+ so answer is HI
4 The [–OH] in a solution is 1.7 × 10–11 M. What is the [H3O+] in this wine?
A)5.9 × 10–4 M D) 1.7 × 10–11 M B)1.0 × 10–7 M E) 1.0 × 10–14 M C) 5.9 × 10–18 M
Answer: The product of concentration of [OH-] [H3O+] = 10^-14
so if [OH-] = 1.7 × 10–11
[H3O+] = 10–14 / 1.7 × 10–11 = 5.88 X 10^-4 M ( option A)
5
What is the pH of a cleaning solution with a [H3O+] = 7.4 × 10–9 M H3O+?
A) 6.9 B) 9.1
C) 4.87 D) 8.13
Answer
pH = -log[H3O+]
In aquesous solution [H3O+] = 7.4 × 10–9 + 10^-7 ( due to water)
pH = -log (7.4 × 10–9 + 10^-7 ) = - log(1.074 X 10^-7 M) = 6.96 ( option A)
6
What is the balanced equation for the acid–base reaction of nitrous acid with lithium hydroxide?
2 LiOH(aq) + H2NO2(aq) ---> 2 H2O(l) + Li2NO2(aq)
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