February 24, 2015
Complete the following and turn in at the end of the period.
Bellwork:
1. Read page 408. Solubility: In your words, explain: “For every combination of solvent
with a solid solute at a given temperature, there is a limit to the amount of solute
that can be dissolved.”
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Demonstration: Sweet tea…..
Answer the following questions on your paper.
Read: Pages 408-410
2. Saturated Versus Unsaturated Solutions.
a. How can you tell that the tea and sugar solution we made are saturated?
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b. Will the solution be saturated or unsaturated if we add more tea?
3. Supersaturated Solutions.
a. A supersaturated solution is a solution that contains more dissolved
________________ than a ___________________ solution contains under the
__________________ conditions.
b. Make an outline (according to the reading), about how to make a
supersaturated solution of sodium acetate, NaCH3COO.
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4. Solubility Values
a. The solubility of a substance is the amount of that substance required to form
a _________________________solution with a specific amount of ________________ at a
specified ____________________________.
b. What is the solubility value of sugar? ___________________
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c. Why must the temperature be specified? _________________________________________
d.
e.
f.
g.
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Solubility values are given as ___________ of solute per _________________ of
solvent of per ___________________ of solvent at a given ____________________.
Table 4. At what temperature will 35.7 g of sodium chloride dissolve in 100 g
of H2O? _____________________________________
Table 4. At what temperature will 39.2 g of sodium chloride dissolve in 100 g
of H2O? __________________________________
Table 4. How many grams of lithium chloride will dissolve in 100 g of H2O at
60 C? ________________________________
Part 2
Read: Pages 410 – 413
Answer the following questions on your paper.
1. Solute - Solvent Interactions
a. What does “like dissolves like” mean?
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b. What makes substances similar depends on the type of ________________.
c. What is polarity and nonpolarity of molecules?
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2. Dissolving Ionic Compounds in Aqueous Solution
a. Define ionic compound?
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b. Define aqueous solution.
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c. Is water a polar molecule? ________________
d. Describe hydration.
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e. What is a hydrate?
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f. Give an example of a compound formula for a hydrate.
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g. How can you remove the water of hydration?____________________________________
h. When you remove the water of hydration what is left?
3. Nonpolar Solvents
a. Why are ionic compounds not soluble in nonpolar solvents?
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b. Why will lithium chloride not dissolve in toluene?
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4. Liquid Solutes and Solvents
a. Give an example of miscible substances. _________________________________
b. Give an example of immiscible substances. ______________________________
c. After reading “Liquid Solutes and Solvents”, what can you assume about the
glycerin and water when we made snow globes? ________________________________
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5. Effects of Pressure on Solubility
a. True or False. Changes in pressure have very little affect on the solubilities of
liquids or solids in liquid solvents.
b. True or False. Increases in pressure have very little affect on gas solubilities
in liquids.
c. How would you increase the solubility of a gas in a liquid?
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6. Henry’s Law
a. State Henry’s Law.
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b. Henry’s law applies to ______________-______________solutions at
_____________________ temperatures.
c. Outline how carbonated beverages are produced.
d. Why do carbonated beverages have effervescence when opened?
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Part 3: Solubility Curves
Reading: Pages 414 – 415
1. Effects of Temperature on Solubility.
a. True or False. Increasing the temperature usually increases gas solubility.
b. If a warm bottle of soda and a cold bottle of soda are opened, which will
effervesce more and why?
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c. Figure 14. Which gas has the greater solubility at 30 C - SO2 or CO2?
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d. True or False. Often, increasing the temperature increases the solubility of
solids.
e. Figure 15. From the graph, you can see that the solubility of NaNO3 is affected
more by temperature than is NaCl. Which substance is affected the most by
temperature? _________________
f. Figure 15. From the graph, which substance does the solubility decrease with
an increase of temperature? _____________________
2. Solubility Curve Worksheet
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