Solutions
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Definitions Solubility Lab Potpourri Solutions
100100 100 100 100100 100
200 200 200 200200 200
300 300 300300 300 300
400 400 400 400 400
500 500 500500 500 500500
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100 Definitions
A homogeneous mixture of substances in a single phase
Answer
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Definitions 100
Answer = solution
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200 Definitions
A solution in which the amount of solute present is less than the
maximum possible at that temperature
Answer
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Definitions 200
Answer = unsaturated solution
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300 Definitions
molarity
Answer
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Definitions 300
Moles of solute per liter of solution
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400 Definitions
The word “dissolution” meansAnswer
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Definitions 400
dissolving
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500 Definitions
Describe the structure of a surfactant and how it works.
Give an example of a surfactant.
Answer
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Definitions 500 Answer
• A surfactant is a large molecule with one polar end and one nonpolar end.
• It enables mixing of immiscible substances.
• Shampoo is a surfactant.
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100 Solubility
What is meant by the phrase “like dissolves like”?
Answer
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Solubility 100 Answer
• Substances of similar polarity are miscible.
• Polar dissolves polar.
• Nonpolar dissolves nonpolar.
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200 Solubility
Explain the equilibrium that exists in a saturated solution
Answer
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Solubility 200
Answer:
solute particles are dissolving and recrystallizing at equal rates
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300 Solubility
Explain how you would use a crystal of solute to determine whether the solution of that solute is saturated,
supersaturated or unsaturated.
Answer
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Solubility 300
Answer:A crystal added to the solution will:– dissolve in an unsaturated solution– sink to the bottom in a saturated solution– cause recrystallization to occur in a
supersaturated solution
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400 Solubility What units are generally used to indicate solubility of a substance
in water?
Answer
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Solubility 400
Answer:
g of solute/100 g water
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500 Solubility
Describe the trends in gas solubility as:
a). Pressure increases
b). Temperature increases
Answer
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Solubility 500
Answer:
As pressure of the gas above the liquid increases, solubility of the gas in the liquid increases.
As temperature of the liquid increases, solubility of the gas in the liquid decreases.
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100 Lab
What solvent will dissolve both polar and nonpolar substances?
Answer
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Answer 100 Lab
• Ethanol, because it has a polar OH end and a nonpolar hydrocarbon end.
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200 Lab
What is the rapid escape of a gas from a liquid in which it was
dissolved?
Answer
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200 Lab Answer
• Effervescence
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300 Lab
An aqueous sample of Fe2+ would show what series of colors when
mixed with reagentsK3FeCN6 K4FeCN6 KSCN
Answer
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Answer 300 Lab
Fe2+ (aq) plus
K3FeCN6 K4FeCN6 KSCN
Deep blue light blue peach
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400 Lab
What mass of NaCl (MM = 58.44 g/mol) is needed to make 75.0 mL of 2.00M
solution?
Answer
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Lab 400
Mole= M x L
= 2.00 M x 0.0750 L = 0.15000 mol
g = 0.1500 mol x 58.44 g = 8.77g NaCl mol
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500 Lab
Describe at least 3 safety precautions to follow when diluting a strong acid.
Answer
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Lab 500
Answer:
Wear gloves, goggles, apron or lab coat.
Do it under the fume hood, fan on.
Always add acid to water.
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100 Potpourri
Designate each of the following as an acid or a base:
H3PO4 NH3 LiOH HBr Answer
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100 Potpourri
• Answer:
H3PO4 NH3 LiOHHBr
Acid Base BaseAcid
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200 Potpourri
What are the three types of solute particles?
Answer
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200 Potpourri
• Atoms, ions, molecules
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300 Potpourri
Substance A dissolves in water.Substance B dissolves in oil.
Substances A and B are immiscible.Make a generalization about the
polarities of substance A and substance B.
Explain! Answer
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300 Potpourri
• Since H2O is polar, substance A must be polar.
• Since A and B are immiscible, as are oil and water, B must be nonpolar.
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400 Potpourri
Name the most accurate pieces of glassware for:A. making a solution of a specific volumeB. measuring a small volume of solution which will be diluted.
Answer
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400 Potpourri Answer
• A. Volumetric flask
• B. Pipet
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Answer
The solubility of ammonia, NH3, is 90 g/100 g of water at 0oC. Draw the solubility curve for this substance.
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Answer Potpourri 500
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100 Solutions
Give an example of a solution in which the solvent is a solid.
Answer
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Answer 100 Solutions
• Alloys such as brass, bronze, sterling silver, white gold are all solid solutions.
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200 Solutions
What volume of 2.00 M NaOH contains 10.0 g of solute?
(MM of NaOH = 40.00 g/mol)
Answer
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Answer for Solutions 200
Moles = 10.00 g X 1mole = 0.250mole 40.00 g
L = moles = 0.250 mole = 0.125 L Molarity 2.00 M
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300 Solutions
What volume of 6.0M HCl is needed to make 3.00 L of
0.500M HCl?Answer in mL.
Answer
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Solutions 300
Answer:
MCVC = MDVD
6.0 M x Vc = 0.500 M x 3.00 L
Vc = 0.25 L = 250 mL of 6.0M HCl
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400 Solutions
Describe 3 ways of increasing the rate at which a substance
dissolves.
Answer
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400 Solutions Answer
• Increase surface area
• Stirring/shaking
• Temperature change (usually increase temp)
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Solutions 500
•
• Answer
Give the solubility of potassium nitrate at 500C. Estimate to the ones place.
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Solutions 500
Answer:
82 g KNO3 / 100 g H2O