15.6 mL of 4.0 M HCl are diluted with water to make 1.5 L of solution. What shou
ID: 890746 • Letter: 1
Question
15.6 mL of 4.0 M HCl are diluted with water to make 1.5 L of solution. What should be the pH of the final solution?
Which of these statements are true?
1. A Bronsted base accepts a proton from an acid.
2. OH- is the conjugate acid of O2-.
3. H3O+ is the conjugate acid of OH-.
4. An Arrhenius acid is a substance that produces H+ ions.
5. The stronger the acid, the smaller the Ka
Answer choices below:
I, IV, V
I, II, IV
II, III
I, III, IV
III, V
a.I, IV, V
b.I, II, IV
c.II, III
d.I, III, IV
e.III, V
Explanation / Answer
(A)
M1 = 4.0 M
v1 = 15.6 mL
M2 = ??
V2 = 1500 mL
M1 V1 = M2 V2
4 x 15.6 = M2 x 1500
M2 = 0.0416 M
new [H+] = 0.0416 M
pH = -log[H+] = -log[0.0416]
= 1.38
pH = 1.38
(B)
answer : b. I, II, IV
explanation:
1. A Bronsted base accepts a proton from an acid. --------> correct
reason: bronsted concept : an acid is a proton donar and base is a proton acceptor
2. OH- is the conjugate acid of O2-. -----------------> correct
O2- + H + --------------------> OH-
base conjugate acid
3. H3O+ is the conjugate acid of OH-. -----------------> wrong
OH- + H+ ----------------------> H2O
base conjugate acid
4. An Arrhenius acid is a substance that produces H+ ions. ----------------> correct
it is defination
5. The stronger the acid, the smaller the Ka
The stronger the acid larger Ka values . smaller pKa value
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.