Name _______________________________________
Solutions Review Activity
Station 1: Solutions
Click on the address and watch the video. https://www.youtube.com/watch?v=M5Tx99IN_K4
1. Define a solution.
2. What is a solute?
Minority component of a solution
3. What is a solvent?
Majority component of a solution
4. What is an aqueous solution?
5. What is meant by the phrase “Water is the universal solvent”.
6. Define concentrated.
7. Define dilute.
8. What is the most common way to quantify the concentration of a solution? _______________
9. Define and show formula for molarity?
10. How do we indicate we have a 3 molar solution of NaCl?
Station 2: Supersaturated Solutions
Watch the video: http://www.youtube.com/watch?v=XSGvy2FPfCw
What is a supersaturated solution?
Describe what happens when the seed crystal is added to a supersaturated solution. Characterize the solution
that is left.
Station 3: Click on the address below:
http://www.ck12.org/chemistry/Dissolving-Process/lecture/user:ZGl6emVlbGl6emllQGdtYWlsLmNvbQ../WhatHappens-when-Stuff-Dissolves/?referrer=concept_details
1. In the boxes below, show an ionic compound dissolves versus how a covalent molecule dissolves when
solutions are formed.
Ionic compound
Covalent compound
Watch the animation of an ionic compound dissolving.
http://group.chem.iastate.edu/Greenbowe/sections/projectfolder/flashfiles/thermochem/solutionSalt.html
Describe how the water molecules surround the + and – ions.
Click on the address http://www.ck12.org/chemistry/Solute-and-Solvent/lesson/user:RiffleWalker/Solute-andSolvent/?referrer=concept_details
Read the passage and watch the following videos.
https://www.youtube.com/watch?v=ek6CVVJk4OQ&feature=related
Explain what is meant by the phrase like
dissolves like.
Draw a picture of why oil and water do not mix.
Station 4: Read the passage on Solubility and solubility curves.
Summarize 2 rules about solubility and temperature.
1.
2.
Why does the solubility of a gas decrease as the temperature increases?
What is the solubility of KNO3 at 50°C?
Station 5:
Go to the address: https://www.youtube.com/watch?v=v6dnEp58mVk&feature=player_embedded
1. What is the formula used to solve Dilution problems
2. What is important to remember about the units used in the dilution formula?
3. Solve the following dilution problems.
How much 2.0 M NaCl solution would you need to make 250 mL of 0.15 M NaCl solution?
What would be the concentration of a solution made by diluting 45.0 mL of 4.2 M KOH to 250 mL?
What would be the concentration of a solution made by adding 250 mL of water to 45.0 mL of 4.2 M KOH?
How much 0.20 M glucose solution can be made from 50. mL of 0.50 M glucose solution?
Station 6: Vapor Pressure Lowering.
Read the passage and answer the following questions.
1. What is a nonvolatile solute?
2. Compare the surface of a pure solvent and a solution.
3. Explain why the vapor pressure of a solution is lower than that of a pure solvent.
4. Why does an ionic compound such as NaCl lower the vapor pressure of a solution more than a glucose
solution?
Station 7: Boiling Point Elevation
Read the passage. Answer the following questions.
1. Why does the addition of a solute to water increase the boiling point?
2. What is the meaning of boiling point elevation?
3. Addition of KCl raises the boiling point of 1.0kg water by 1.04°C. How many moles of KCl were added?
________________________________
Station 8: Freezing Point Depression
Read the passage “Why salt icy roads?”
1. Describe what happens when a pure solvent freezes.
2. How does a solute affect the freezing of water?