Question

Chemistry 151 Lab 3: Density of Solids and Liquids Introduction In this lab, we will explore common methods for measuring density. With liquids, one can simply measure the mass with a balance, the volume with a graduated cylinder, and then take the ratio of the two. For solid objects, if it's a simple shape, you might be able to determine its volume by measuring its dimensions and find its volume mathematically. However, an alternate method for measuring volume, which is especially useful when the shape is irregular, is an indirect method known as water displacement. If you place the object in a known volume of water, the water level will increase by a volume equal to that of the object. Procedure PART I: Determining the density of a liquid. 1. Measure the mass of a 10 mL graduated cylinder. 2. Measure approximately 5 mL of rubbing alcohol using the graduated cylinder from step 1. 3. Measure the mass of the graduated cylinder with the liquid, and then determine the mass of your liquid. 4. Using the mass and volume of the liquid, determine its density. 5. Repeat steps 1-4 using ~7 mL of alcohol. 6. Repeat steps 1-4 using ~10 mL of alcohol. PART II: Determining the density of a liquid. Trial 1 Trial 2 Trial 3 1) Mass of graduated cylinder (g) 2) Mass of graduated cylinder and liquid (g) 3) Mass of liquid (g) 4) Volume of liquid (mL) 5) Density of liquid (g/mL) 6) Average density (g/mL) Show your work for determining the density of Trial #1

Chemistry 151
Lab 3: Density of Solids and Liquids

Introduction
In this lab, we will explore common methods for measuring density. With liquids, one can simply measure the mass with a balance, the volume with a graduated cylinder, and then take the ratio of the two. For solid objects, if it's a simple shape, you might be able to determine its volume by measuring its dimensions and find its volume mathematically. However, an alternate method for measuring volume, which is especially useful when the shape is irregular, is an indirect method known as water displacement. If you place the object in a known volume of water, the water level will increase by a volume equal to that of the object.

Procedure
PART I: Determining the density of a liquid.

1. Measure the mass of a 10 mL graduated cylinder.
2. Measure approximately 5 mL of rubbing alcohol using the graduated cylinder from step 1.
3. Measure the mass of the graduated cylinder with the liquid, and then determine the mass of your liquid.
4. Using the mass and volume of the liquid, determine its density.
5. Repeat steps 1-4 using ~7 mL of alcohol.
6. Repeat steps 1-4 using ~10 mL of alcohol.

PART II: Determining the density of a liquid.

Trial 1 Trial 2 Trial 3
1) Mass of graduated cylinder (g) __________ __________ __________
2) Mass of graduated cylinder and liquid (g) __________ __________ __________
3) Mass of liquid (g) __________ __________ __________
4) Volume of liquid (mL) __________ __________ __________
5) Density of liquid (g/mL) __________ __________ __________
6) Average density (g/mL) __________ __________ __________

Show your work for determining the density of Trial #1

Added by Montserrat M.

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