CHEM 280: Lecture Quiz 6 Questions & Answer with Complete Solution 100% Correct | New 2026 | Graded A+

CHEM 280: Lecture Quiz 6
Study online at https://quizlet.com/_cz23b9

1. What is the conjugate base of H2O? OH-

2. If the pH of an aqueous solution changed from It increased.
9.10 to 4.67, what happened to the hydronium
ion concentration?

It became less than zero.
It decreased.
It increased.
It became zero.
none of the above

3. What is the concentration of H⁺ in 2.0 M acetic < 2.0 M
acid, HC2H3O2?

>2.0 M
< 2.0 M
1.0 M
2.0 M
none of the above

4. A 25.0 mL sample of 0.105 M HCl was titrated (25ml)(.105M
with 31.5 mL of NaOH. What is the concentration HCl)=M1(31.5ml)2.625/31.5=M1
of NaOH? (31.5ml/31.5 =M1=0.0833

0.0833 M
0.105 M
0.132 M
0.075 M
none of the above

5. What is the concentration of H+ in solution given [H+][OH-]=1x10^-4 2.54x10^-4
the [OH⁻] = 2.54 × 10-4? [H+]=3.937x10^-11
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, CHEM 280: Lecture Quiz 6
Study online at https://quizlet.com/_cz23b9


3.94 × 10 -11 M
1.0 × 10 14 M
2.54 × 10 -11 M
not enough information
none of the above

6. The Bronsted-Lowry definition of an acid is: a proton donor.

a proton donor.
produces OH⁻ in solution.
a proton acceptor.
produces H⁺ in solution.
none of the above

7. Carboxylic acids can be found in: all of the above

lemons.
grapes.
apples.
all of the above
none of these

8. What are the products of a neutralization reac- water and salt
tion?

water and salt
oil and water
salt and carbon dioxide
carbon dioxide and water
none of the above

9. A buffer solution is all of the following EXCEPT:

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