AP Chemistry Quiz

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AP Chemistry Quiz - Unit 8

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1. What is the best estimate for the pH of a 1 • 10⁻³ M HI(aq) solution at 25˚C? *

1 point

pH = 3

pH = 6

pH = 9

pH =12

2. What is the best estimate for the pH of a 9.5 • 10⁻⁴ M KOH(aq) solution at 25℃? *

1 point

pH = 3

pH = 6

pH = 8

pH = 11

3. Which of the following is correct about the provided reaction at 25℃? *

1 point

pOH = 1.0 • 10⁻¹⁴

pH = 7

[H₃O⁺] = 1.0 • 10⁻¹⁴

[OH⁻⁻] = 7.0 M

4. Which of the following acids is the best conductor of electricity? *

1 point

HBr

HCN

HNO₂

5. A student initially prepared a solution of 20. mL of 0.002 M NaOH(aq). After, the student added 10mL of distilled water in the solution. Which of the following is the best estimate of the pH of the solution? *

1 point

Questions 6-8: A student performed an experiment by titrating 30.0mL of 1.0M KOH with 2.0M H₂S. (Kₐ = 1.0 x 10⁻⁷)

6. How much hydrogen sulfide (H₂S) should be added to reach the equivalence point? *

1 point

10.0mL

15.0mL

20.0mL

25.0mL

7. Which of the following is correct about the equivalence point? *

1 point

The equivalence point is acidic because H2S has a higher molar concentration.

The equivalence point is acidic because the only ions left during the equivalence point is the conjugate acid.

The equivalence point is neutral because the same amount of base and acid remains.

The equivalence point is basic because the only ions left during the equivalence point is the conjugate base.

8. Around which pH range would the buffer be the most effective for the reaction? *

1 point

0-3

3-6

6-11

11-14

9. Which of the following is amphoteric? *

1 point

H⁺

NH₃

CO₃²⁻

H₂SO₃

10. What is the ionization constant, Kₐ, for a weak monoprotic acid if a 0.20 molar solution has a pH of 5? *

1 point

5 • 10⁻¹⁰

1 • 10⁻⁴

2.5 • 10⁻⁵

4 • 10⁻⁶

11. A scientist titrated 30.0 mL of 0.10 M KOH(aq) with a strong acid. The following data presents the result of the experiment. What is the concentration of the base? Graph Source: pH curves (titration curves). (n.d.). https://www.chemguide.co.uk/physical/acidbaseeqia/phcurves.html. *

1 point

0.6 M

0.12 M

0.24 M

0.36 M

12. [related to the question above]: Which of the following could be the species that is being titrated with KOH? *

1 point

H₂S

HCOOH

HCl

H₂O

13. What would be the pH of the solution after 1.68 grams of HClO₃ is being added in 2 liters of distilled water? (molecular weight of HClO₃ = 84.0g) *

1 point