1. Which of the following substances is a strong acid? a. HCIO -- weak acid b. H
ID: 700306 • Letter: 1
Question
1. Which of the following substances is a strong acid?
a. HCIO -- weak acid
b. HF -- weak acid
c. HNO2 -- weak acid
d. H3PO4 -- weak acid
e. HNO3 -- strong acid acid
Therefore option (e) is correct
2. What is the pH of a 0.050 M solution of NaOH, a strong base?
NaOH ---> Na+ + OH-
[OH-]=[NaOH] = 0.050 M
pOH = - log[OH-]
= - log 0.05
= 1.3
We know that pH + pOH = 14
pH = 14 - pOH
= 14 - 1.3
= 12.70
Therefore option (a) is correct.
3. The Ka of acetic acid is listed at 1.8x10-5 . What is the Kb of its conjugate base, acetate?
We knon that Ka x Kb = Kw = 1.0x10-14
So Kb = Kw / Ka
= (1.0x10-14 )/ (1.8x10-5 )
= 5.56x10-10
Therfore option (c) is correct
Explanation / Answer
1. Which of the following substances is a strong acid?
a. HCIO
b. HF
c. HNO2
d. H3PO4
e. HNO3
2. What is the pH of a 0.050 M solution of NaOH, a strong base?
a. 12.70
b. 7.00
c. 13.95
d. 0.05
e. 1.30
3. The Ka of acetic acid is listed at 1.8x10-5 . What is the Kb of its conjugate base, acetate?
a. 1.8x109
b. 1.8x10-19
c. 5.56x10-10
d. 5.56x1018
e. 1.00x10-7
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.