Ethanol Solution Preparation Concepts

Ethanol Solution Preparation Concepts

Assessment

Interactive Video

Biology

9th - 10th Grade

Practice Problem

Hard

Created by

Patricia Brown

FREE Resource

This video tutorial explains how to use the C1V1=C2V2 equation to prepare a diluted ethanol solution for an experiment involving daphnia. It covers setting up the experiment, understanding ethanol concentrations, and applying the equation to calculate the necessary volume of stock solution. The tutorial concludes with preparing the final solution by mixing the calculated volume of stock with water.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the primary purpose of using the C1V1 = C2V2 equation in the experiment described?

To find the volume of stock solution needed to create a new solution

To calculate the heart rate of daphnia

To measure the temperature of the ethanol solution

To determine the concentration of ethanol in the stock solution

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why is the 10% ethanol stock solution considered unsuitable for direct use with daphnia?

It is too expensive

It has too high of an ethanol concentration

It is not pure enough

It is too diluted

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the desired concentration of the new ethanol solution for the experiment?

5%

2%

10%

20%

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which variable represents the volume of the new solution to be made?

V1

C1

V2

C2

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the known concentration of the stock solution in the problem?

2%

20%

10%

5%

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How do you simplify the equation to solve for V1?

Multiply all terms by 10

Cancel the percent signs and divide

Subtract the volumes

Add the concentrations

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the calculated volume of the stock solution needed to make the final solution?

8 milliliters

2 milliliters

4 milliliters

6 milliliters

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