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Buffer Solutions and pH Calculations

Buffer Solutions and pH Calculations

Assessment

Interactive Video

Chemistry

11th - 12th Grade

Practice Problem

Hard

Created by

Patricia Brown

FREE Resource

Ms. J Chem explains how to calculate the pH of buffer solutions using the Henderson-Hasselbalch equation. The video covers the assumptions made in the equation, such as the partial dissociation of weak acids and complete dissociation of salts. Two examples are provided: one with ethanoic acid and sodium ethanoate, and another with ethanoic acid and sodium hydroxide. The video demonstrates how to use the equation to find the pH, emphasizing the importance of understanding the initial and equilibrium concentrations of the components.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What equation is used to calculate the pH of a buffer solution?

Henderson-Hasselbalch equation

Nernst equation

Arrhenius equation

Van't Hoff equation

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which assumption is made about the weak acid in the Henderson-Hasselbalch equation?

It does not dissociate at all

It partially dissociates

It reacts with the salt

It completely dissociates

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the pKa value of ethanoic acid used in the first example?

6.25

4.76

3.50

5.00

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In the first example, what is the calculated pH of the buffer solution?

5.00

4.50

5.10

4.92

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which section of the data booklet contains the pKa value of ethanoic acid?

Section 21

Section 10

Section 5

Section 1

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the limiting reactant in the second example involving ethanoic acid and sodium hydroxide?

Ethanoic acid

Sodium ethanoate

Sodium hydroxide

Water

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is produced when sodium hydroxide reacts with ethanoic acid?

Sodium sulfate and water

Sodium chloride and water

Sodium carbonate and water

Sodium ethanoate and water

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