Salt Water Density Lab - blogs



Name __________________________ Date _____________ Period _______

Pre Lab Information

Define the following terms:

| |Definition |

| Mass | |

|Volume | |

|Density | |

|Salinity | |

Remembering how to calculate density!

What is the formula for calculating density?

Density = ______ / ____________

What is the standard unit for:

Mass ____________ Volume ________ or _________

w/ruler /cylinder

Therefore, the standard unit for Density is

___________________ ____________________

if calculating volume with a ruler if determining volume with a cylinder

Saltwater Density Lab Sheet

Name __________________________ Date ____________ Period _______

Question: ____________________________________________________________

Hypothesis: If salt is added to water, then the density of the water will_____________________.

Think about it: Will you be changing the mass or the volume???? (increase or decrease)

1. The mass of the empty beaker = ____________ (use unit)

Remember to include the units: Mass is g --- Volume is mL – Density g/mL

| | |÷ |═ |

|DATA |Mass of Water |Volume of water |Density |

|TABLE | | | |

| |3. |2. |4. |

|Fresh water | | | |

| |8. |2. |9. |

|Saltwater | | | |

Question 1: Did the egg float in the fresh water? Yes No

Question 2: Did the egg float in the salt water? Yes No

Question 3: Which beaker had a higher density? Fresh water Saltwater

Question 4: What changed in the water to make the egg float? ______________________________________________________________________

Question 5: Rank the egg, fresh water, and saltwater based on their density.

Most Dense ______________, ______________, ______________ Least Dense

Question 6: Humans float easily in the Dead Sea. Give two reasons why you think this is possible?

1._____________________________________________________________________________

2. ____________________________________________________________________________

Read and complete all of the directions below.

Write the question and hypothesis on your lab sheet.

Question: How does salinity change the density of water?

Hypothesis: If salt is added to water, then the density of the water will _________

(complete this statement on your lab sheet)

Procedures:

1. Measure the mass of the empty beaker; record on lab sheet

2. Pour 200 mL of fresh water into the beaker; record this volume in the volume column

in both fresh and salt water rows of the data table.

3. Follow the directions below to determine the mass of the fresh water:

A. Measure the mass of the beaker with the water.

B. Subtract the mass of the empty beaker (see #1).

C. Record the mass of the fresh water on the data table.

mass of beaker mass of mass of

with water empty beaker water

4. Calculate the density of the fresh water, Mass ÷ Volume; record density on data table

5. Gently place the egg in the beaker. Answer Question 1

6. Take the egg out of the water and set it on the paper towel.

7. Add 4 rounded spoons of salt to the water – stir gently until dissolved.

8. Follow the directions below to determine the mass of the salt water:

A. Measure the mass of the beaker with the salt water.

B. Subtract the mass of the empty beaker (see #1)

C. Record the mass of the saltwater on the data table.

9. Calculate the density of the saltwater, Mass ÷ Volume; record density on data table

10. Gently place the egg in the saltwater. Answer Questions 2 – 6.

11. Clean Up: Pour salt water into the sink, rinse and dry the beaker.

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