SCICR Chemistry - Unit 30: Acid-Base Chemistry

Your Mark is: 70% 55% 1st attempt returned 11/23/21, passed retake

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Acid-Base Chemistry

1) Identify all the characteristics of an Acid.

A) bitter taste
B) pH is less than 7
C) accepts H + ions
D) electrical conductor
E) turns litmus indicator from blue to red

Correct!

2) Identify all the characteristics of a Base.

A) pH is greater than 7
B) Accepts H + ions
C) sour taste
D) turns litmus indicator from red to blue
E) Donates H + ion

Correct!

Use the following terms to answer the following questions.

Word Bank
solution	solute
solvent	concentration
molarity	titration
volumetric	quanitative
qualitative	indicator

3) This is the substance that is being dissolved.

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4) This mathematically describes the amount of solute compared to the amount of solvent.

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5) This is a technique used in laboratories to analyze neutralization reactions.

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6) This process uses tools such as a pipet and a buret.

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7) This is a substance that changes color based on pH.

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What is a titration?

8) Strong acids and strong bases completely break apart into ions.

True

False

Correct!

9) Why do the products of a chemical reaction between a strong acid and a strong base have a pH of 7?

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10) What is the purpose of an indicator in the solution with the unknown concentration?

A) It tells when there is enough base in the solution

B) It tells when there is enough acid in the solution

C) It tells when the equivalence point is obtained

Correct!

11) What is the endpoint of a titration?

A) Where the amount of acid and base are equal as shown by a colour change

B) When the volume of base in the burette is used up

C) Where there is no base

D) When there is no acid

Correct!

12) Which solution usually goes in the burette?

A) acid

B) base

C) indicator

D) water

Correct!

13) During a titration, _____ is carefully added to _______.

A) acid; water

B) acid; base

C) phenolphtalein; base

D) base; acid

Correct!

How are titrations analyzed?

14) A titration curve is a graphical representation of changes in pH over time.

True

False

Correct!

Use the following graph below to answer the following questions.

15) Before the titration began, what was the pH of the solution?

A) 3.8

B) 5.0

C) 8.0

D) 12.5

Correct!

16) At the equivalence point of the titration, what was the pH of the solution?

A) 3.8

B) 5.0

C) 8.0

D) 12.5

Correct!

17) At the endpoint of the titration, what was the pH of the solution?

A) 3.8

B) 5.0

C) 8.0

D) 12.5

Correct!

18) What volume of the titrant was added to reach the equivalence point?

A) 7.5 mL

B) 15.0 mL

C) 20.0 mL

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19) What is the possible identity of the analyte?

A) acid

B) base

C) indicator

D) salt

E) water

Correct!

20) What is the possible identity of the titrant?

A) acid

B) base

C) indicator

D) salt

E) water

Correct!

21) What are the possible identities of the substances that are formed during the titration?

A) acid
B) base
C) indicator
D) salt
E) water

Not Graded

22) What is the possible identity of the substance that caused the endpoint?

A) acid

B) base

C) indicator

D) salt

E) water

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Mathematical Calculations of Concentration

23) What is the purpose of a titration experiment?

A) formulate solutions

B) sodium reactions

C) using an indicator

D) determining concentration

Correct!

24) Phenolphthalein is an indicator that changes from clear to pink when...

(check all that apply)

A) the pH raises above 7
B) the solution becomes acidic
C) the pH drops below 7
D) the solution becomes basic
E) the concentration of the solution drops

Correct!

25) What is the molarity (M) of a solution by dissolving 2.2 mol NaCl into 2.0 L of solution?

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26) What is the molar ratio between HCl and NaOH according to the balanced equation below?

HCl + NaOH --> H₂O + NaCl

A) 1:2

B) 1:1

C) 2:2

D) 1:3

E) 2:1

Correct!

ChemLab: Titration

27) In a titration, the titrant is the substance that is placed in the burette and added to the analyte in the flask.

True

False

Correct!

28) In a titration, the analyte is a substance of unknown composition or concentration that is placed in a flask.

True

False

Correct!

29) Which type of titration is shown by the titration curve below?

A) Titration of a strong acid by a strong base

B) Titration of a weak acid by a strong base

C) Titration of a weak base by a strong acid

D) Titration of a strong base by a strong acid

Correct!

30)

ChemLab: Titration

Student Exploration Lab Sheet

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