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You are using a Pasteur pipet and want to determine the volume of liquid dispensed in a drop. You add 12 drops into a 10 mL graduated cylinder and observe the volume shown below. What volume (in mL) is dispensed in each drop?

You are using a Pasteur pipet and want to determine the volume of liquid dispensed in a drop. You add 12 drops into a 10 mL graduated cylinder and observe the volume shown below. What volume (in mL) is dispensed in each drop?

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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You are using a Pasteur pipet and want to determine the volume of liquid dispensed in a drop. You add 12 drops into a 10 mL graduated cylinder and observe the volume shown below.

What volume (in mL) is dispensed in each drop?

### Understanding How to Read a Graduated Cylinder A graduated cylinder is a common laboratory tool used to measure the volume of a liquid. It is marked with a series of lines known as graduations which indicate the volume of the liquid contained within the cylinder. #### Detailed Analysis of the Graduated Cylinder - **Viewing the Graduation Lines:** - The cylinder in the image contains several horizontal lines. - The larger, numbered lines represent whole units of measurement, in this case, milliliters (mL). - The smaller lines indicate fractions of these units, typically in increments of 0.1 mL. - **Reading the Meniscus:** - When reading the volume, ensure your eye level is even with the meniscus, which is the curved surface of the liquid. - In the image, the meniscus is between the 2 mL and 3 mL marks, specifically at 2.8 mL. #### Explanation of the Parts of the Graduated Cylinder: - **Top Section:** - The top of the liquid aligns with the meniscus, showing that this is the highest point where the liquid touches the cylinder walls. - **Middle Section:** - The main body of the cylinder, where the graduations are more tightly packed, allows for precise measurements. - **Graduation Marks:** - Notice that each major line is numbered, while minor divisions between them generally represent tenths of a milliliter. #### How to Ensure Accuracy: - **Positioning:** - Place the cylinder on a level surface. - Avoid parallax error by making sure that your eye is at the same height as the meniscus. - **Recording Volume:** - Always record the volume based on the bottom of the meniscus. Understanding these basics will allow you to accurately measure and record liquid volumes in a laboratory setting, ensuring precision and reliability in your experiments and data collection.
Transcribed Image Text:### Understanding How to Read a Graduated Cylinder A graduated cylinder is a common laboratory tool used to measure the volume of a liquid. It is marked with a series of lines known as graduations which indicate the volume of the liquid contained within the cylinder. #### Detailed Analysis of the Graduated Cylinder - **Viewing the Graduation Lines:** - The cylinder in the image contains several horizontal lines. - The larger, numbered lines represent whole units of measurement, in this case, milliliters (mL). - The smaller lines indicate fractions of these units, typically in increments of 0.1 mL. - **Reading the Meniscus:** - When reading the volume, ensure your eye level is even with the meniscus, which is the curved surface of the liquid. - In the image, the meniscus is between the 2 mL and 3 mL marks, specifically at 2.8 mL. #### Explanation of the Parts of the Graduated Cylinder: - **Top Section:** - The top of the liquid aligns with the meniscus, showing that this is the highest point where the liquid touches the cylinder walls. - **Middle Section:** - The main body of the cylinder, where the graduations are more tightly packed, allows for precise measurements. - **Graduation Marks:** - Notice that each major line is numbered, while minor divisions between them generally represent tenths of a milliliter. #### How to Ensure Accuracy: - **Positioning:** - Place the cylinder on a level surface. - Avoid parallax error by making sure that your eye is at the same height as the meniscus. - **Recording Volume:** - Always record the volume based on the bottom of the meniscus. Understanding these basics will allow you to accurately measure and record liquid volumes in a laboratory setting, ensuring precision and reliability in your experiments and data collection.
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