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Table 1. Solubility Product Constant/Common-Ion Effect

Part A: Calcium Iodate, No added Calcium Ion

Trial #1

Trial #2

Concentration of Sodium Thiosulfate Solution (M)

0.1003

0.1003

Volume of Calcium Iodate Solution Added (mL)

5

5

Final Volume, Thiosulfate Solution (mL)

21.95

29.2

Initial Volume, Thiosulfate Solution (mL)

16

23

Total Volume, Thiosulfate Solution (mL)

Total Volume, Thiosulfate Solution (L)

Moles Sodium Thiosulfate Used

Moles Iodate

Equilibrium Concentration of Iodate Ion (M)

Equilibrium Concentration of Calcium Ion (M)

Molar Solubility of Calcium Iodate (M)

Ksp, Calcium Iodate

Average For Ksp, Calcium Iodate

Table 2. Solubility Product Constant/Common-Ion Effect

Part B: Calcium Iodate, added Calcium Ion

Trial #1

Trial #2

Concentration of Sodium Thiosulfate Solution (M)

0.1003

0.1003

Volume of Calcium Iodate Solution Added (mL)

5

5

Final Volume, Thiosulfate Solution (mL)

23.5

26.7

Initial Volume, Thiosulfate Solution (mL)

20.1

23.5

Total Volume, Thiosulfate Solution (mL)

Total Volume, Thiosulfate Solution (L)

Moles Sodium Thiosulfate

Moles Iodate

Equilibrium Concentration of Iodate Ion (M)

Equilibrium Concentration of Calcium Ion (M)

Molar Solubility of Calcium Iodate (M)

(Added Ca2+ ion source)

Average Molar solubility of calcium iodate

(Added Ca2+ ion source)

“Scout Titration”

Volume of Calcium Iodate Solution Added (mL)

5

Final Volume, Thiosulfate Solution (nearest mL)

20.1

Initial Volume, Thiosulfate Solution (nearest mL)

16.93

Total Volume, Thiosulfate Solution (nearest mL)

1. Complete the calculations to fill out the data table above and show your work.

2. Complete the results:

 Create a 2nd Excel sheet “Results Part A” which should include the columns:

o Volume Thiosulfate o Moles Thiosulfate o Moles Iodate

o Equilibrium concentration of Iodate Ions

o Equilibrium concentration of Calcium Ions

o Molar Solubility

o Ksp

o Average Ksp

o % Error

 Create a 3rd Excel sheet “Results Part B” which should include the columns:

o Volume Thiosulfate

o Moles Thiosulfate

o Moles Iodate

o Equilibrium concentration of Iodate Ions

o Equilibrium concentration of Calcium Ions

o Molar Solubility

o Average Molar Solubility

Include 1-5 sentences that briefly summarize the procedure and what information was obtained

■ Example: – ____ g (or mL) of Reagent A were reacted with _____ g (or mL) of Reagent B until a precipitate formed/gas evolved/color change occurred. Observations were made and data were collected. Table 1 represents _____. Table 2 represents _____. Figure 1 represents _____. Figure 2 represents ____.

3. Complete the discussion questions and be specific

1. Discuss the calculated Ksp, and compare that to the known Ksp value.

2. Discuss the results of the common ion (added Ca) trial. Were they as expected? Why or why not?

4. Write a conclusion paragraph answering the questions below and be specific

■ Restate the purpose of the experiment

■ How did you attempt to meet the purpose?

■ Was the purpose met?

■ Restate the anticipated outcome. Was the actual outcome close to the anticipated outcome?

■ Why or why not? What errors did you specifically experience in this experiment? – Distance-learning format of the class is not an error

■ What are some future improvements to this experiment? – “Updating the lab manual”, “clear/better instructions on how to perform calculations”, “instructor not explaining the lab procedure”, “do not make the class a distance-learning course”, etc. are NOT future improvements

PAGES 222-230 IN LAB MANUAL ATTACHED BELOW

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