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(Solved) Experiment 1: Speleology: Understanding Cave Formation Caves are


I need help with this labs for my geology course! All the information is attached below. 


Experiment 1: Speleology: Understanding Cave Formation

 

Caves are found all over the world and contribute to a variety of biological and environmental

 

phenomena. Caves are comprised of a variety of substances, but often contain limestone. In

 

this experiment, you will view the effect of chemical weathering on limestone and apply that

 

impact to caves on Earth.

 


 

Materials

 


 

100 mL of Acetic Acid (vinegar, an acid with a

 

pH of 3), C2H4O2

 

(3) 250 mL Beakers

 

100 mL Carbonated Water

 

2 Chalk Pieces (made of limestone, a naturally

 

occurring material), CaCO3

 

Permanent Marker

 


 

Scale

 

3 Seashells

 

*Stopwatch

 

*100 mL Water, H20

 

*You Must Provide

 


 

Procedure

 

Part 1

 

1. Use the permanent marker to label the first beaker as "Water," the second beaker as

 

?Carbonated Water,? and the final beaker "Vinegar."

 

2. Pour 50 mL of each liquid into the corresponding labeled beaker.

 

3. Use the scale to determine the mass of each beaker. Record the initial mass in Table 2.

 

4. Break two pieces of chalk in half so that you have four pieces of chalk.

 

5. Place one small piece of chalk in each beaker. Weigh and record the new mass of the

 

beaker in Table 2.

 

6. Determine the mass of each piece of chalk by subtracting the mass of the beaker

 

from the mass of the beaker + chalk. Record your data in Table 2.

 

7. Formulate a hypothesis to predict what will happen to the chalk in each cup. Record

 

your hypothesis as the answer to Post-Lab Question 1.

 

8. Add one piece of chalk to each beaker. Immediately begin timing the reaction. After

 

one minute, evaluate the beakers and record your observations in Table 3. Continue

 

to observe the beakers for five minutes, and record all observations in one minute

 

intervals.

 

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9. Thirty minutes after adding chalk to each beaker, re-mass each beaker on the scale.

 

Record the final mass values in Table 2.

 

10. Calculate the change (?) in mass for each piece of chalk by subtracting the initial mass

 

from the final mass.

 

11. Calculate the percent change in the mass using the following formula:

 

(?m/mi ) 100 where ?m = change in mass and mi = initial beaker + chalk mass.

 

Record your percent change answers in Table 2.

 


 

Table 2: Part 1 Experiment Data

 

Beaker

 


 

Beaker

 

Mass (g)

 


 

Initial Beaker

 

+

 

Chalk

 

Final Beaker + ? Mass

 

? Mass (%)

 

Chalk Mass Mass (g) Chalk Mass (g)

 

(g)

 

(g)

 


 

Water

 

Carbonated

 

Water

 

Vinegar

 


 

Table 3: Beaker + Chalk Observations

 

Time (minutes)

 


 

Water

 


 

Carbonated Water

 


 

Acetic Acid

 


 

1

 

2

 

3

 

4

 

5

 


 

Part 2

 

1. Rinse out the beakers used in Part 1. Pat them dry with a towel or allow them to air

 

dry.

 

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2. Repeat Part 1, Steps 2 - 10. This time, use a seashell rather than a piece of chalk.

 

Record your data and observations in Tables 4 and 5. Don?t forget to record a

 

hypothesis stating what you predict will happen to the seashell when placed in each

 

beaker; record this in Post-Lab Question 2.

 


 

Table 4: Part 2 Experiment Data

 

Beaker

 


 

Beaker

 

Mass (g)

 


 

Initial Beaker Shell Mass Final Beaker + ? Mass

 

? Mass (%)

 

Shell Mass (g)

 

(g)

 

Shell Mass (g)

 

(g)

 


 

Water

 

Carbonated

 

Water

 

Vinegar

 


 

Table 5: Beaker + Seashell Observations

 

Time (minutes)

 


 

Water

 


 

Carbonated Water

 


 

1

 

2

 

3

 

4

 

5

 


 

Post-Lab Questions

 

1. Record your hypotheses from Part 1, Step 7 here.

 


 

2. Record your hypotheses from Part 2 here.

 


 

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Acetic Acid

 


 

3. Compare and contrast the reaction of chalk pieces in each of the lab liquids.

 


 

4. Based on this experiment, explain how a limestone cave forms. Incorporate the

 

following terms in your description: chemical weathering, carbonic acid, calcite

 


 

5. How is the effect of a weak acid on a seashell and chalk related?

 


 

6. What environmental factors could affect rates of weathering where you live?

 


 

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All Rights Reserved

 


 

 


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