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1. Chapter 11 S Ksp 12 At 25 o C the solubility of zinc sulfide is 1.26 x 10-12 mol/L. Calculate the value of Ksp at this temperature. Give your answer in scientific notation to 2 SIGNIFICANT FIGURES (even though this is strictly incorrect).

Student Response 1. 1.6E-24

Value

Correct Answer

100%

Equals 1.6e-24 (100%)

General Ksp = S2 Feedback: Score:

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2. S g to Ksp 7 The solubility of silver(I)phosphate at a given temperature is 2.961 g/100 mL. Calculate the Ksp at this temperature. Use E notation and give your answer to 3 significant figures.

Student Response Answer 6.76E-4 Score:

Value

Correct Answer

100%

6.73E-4 (6.73 × 10-4 )

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3. Chapter 11 Ksp S 20 What is the solubility in moles/liter for barium fluoride at 25 o C given a Ksp value of 1.7 x 10-6 . Write using scientific notation and use 1 or 2 decimal places (even though this is strictly incorrect!)

Student Response 1. 7.52E-3

Value

Correct Answer

100%

Equals 7.52e-3 (100%) Equals 7.5e-3 (100%) Equals 7.51e-3 (100%)

General Ksp = 4S3 Feedback: Score:

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4/15/2009 10:52 PM

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4. Chapter 11 Common Ion Effect 33 The Ksp of Al(OH)3 is 1.0 x 10-33 . What is the solubility of Al(OH)3 in a solution that has pH = 12? Give your answer using scientific notation and to 2 significant figures (i.e., one decimal place).

Student Response 1. 1.0E-27

Score:

Value

Correct Answer

100%

Equals 1.0e-27 (100%) Equals 1e-27 (100%)

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5. pH Solubility 2 Which of the following compounds will have a different solubility with a change in pH?

Student Value Response 1. AgNO3

0%

2. CaCl2

0%

Correct Answer Feedback

3. Ca(OH)2 100% 4. CuCl

0%

5. Hg2 Cl2

0%

Score:

1/1

6. Precipitate 12 A precipitate of lead(II)chloride forms when 100.0 mg of NaCl is dissolved in 0.250 L of 0.12 M lead(II)nitrate. True or False? Ksp of PbCl2 is 1.7 x 10-5 .

Student Value Response 1. True

0%

2. False

100%

Score:

Correct Answer Feedback

0/1

Done

4/15/2009 10:52 PM