Concentration-and-Molarity-PhET-Labs-KEY.pdf PDF

Concentrations Worksheet: Molarity and Molality. Concentration is a measurement of how much solute (substance) is in a given amount of solvent (liquid).

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Concentration-and-Molarity-PhET-Labs-KEY.pdf

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Concentration-and-Molarity-PhET-Labs-KEY.pdf

Concentration and Molarity PhET Labs Name: ________________________ Procedure: https://phet.colorado.edu/sims/html/concentration/latest/concentration_en.html

Part 1: Dissolution and Saturation

Take some time to play and familiarize yourself with the simulation.

Click on everything. Move all

the sliders.

Notice what

happens to the concentration as solid solute is added and when evaporation occurs.

1.How does the concentration change as solid solute is added? ___________________________________

_ 2.How does the concentration change as additional water is added? ______________________________ __ 3.How does the concentration change as evaporatio n occurs? _________________________________________________ __ 4.H ow do you know when a solution is saturated? ____________________________________________________________

6.When a solution is saturated, and additional solid solute is added, what happens? _________________________________

7.Why do you think this is? _______________________________________________________________________________

8.How does adding this additional solute change the concentration of this saturated solution? _________________________

9.How does evaporation change the concentration of a saturated solution? ________________________________________

Part 2: Concentrated Solutions (same website as part 1 just click on the Solution option)

10.Adding a concentrated solution... describe a way to determine the concentration of the solution in the spigot. Write

your plan here: _____________________________________________________________________________ _______________________________________________________________________________________________

11.Using your plan...how might you get that concentrated solution to become saturated? ____________

_____________________________________________________________________________________

12.Does your plan work for all the other solutions too? Why? / Why Not?___________

______________________________________________________________________________________________ Part 3: Molarity https://phet.colorado.edu/sims/html/molarity/latest/molarity_en.html M olarity is moles per Liter, that is, how many moles of solute (entire salt) is dissolved per Liter of solution.

First, determine the

saturation concentration of each of the solutions, that is, how concentrated can you get each solution before the solution is saturated. If you can't determine the concentration using the simulation "Molarity", try using the simulation "Concentration" (You will use this information again in

Part 5, if your instructor requires it)

Saturation

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Saturation

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Part 4: Calculating Molarity Using the simulation and the formula for Molarity on the front, complete the table below.

Moles of

Compound (mol)

Liters of Solution

(L)

Molarity of

Solution (M)

Moles of

Compound (mol)

Liters of Solution

(L)

Molarity of

Solution (M)

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Conclusion Questions

and Calculations, Concentration and Molarity Post-Lab Exercises

1.Adding pure water to a saturated solution (with no solids) would cause the concentration of that solution to increase /

d ecrease / remain the same. (circle)

2.Adding pure water to a saturated solution (with some solids) would cause the concentration of that solution to initially

increase / decrease / remain the same. (circle)

3.Adding a solid salt to a saturated solution causes the concentration of that solution to increase / decrease / remain the same.

4.Evaporation acting on an unsaturated solution causes the solution"s concentration to increase / decrease / remain the same.

5.Evaporation acting on a saturated solution causes the solution"s concentration to increase / decrease / remain the same.

6.U

sing your notes, your text, or the internet discover what happens to the saturation concentration when a solution"s

temperature is increased. What happens as a solution is heated? _____________________________________________

7.Why does this happen? (hint...think about the molecules) ___________________________________________________

8.C an you dissolve .35 moles of Potassium Permanganate (KMnO

4) into 500 mL of water? _________ Why? / Why not?

(please show work) 9.C an 1750 mL of water dissolve 4.6 moles of Copper Sulfate CuSO

4? _________ Why? / Why not? (please show work)

10.W hat is the solution concentration formed from 3.6 moles NaCl dissolved into 1.3 L of water? (please show work) 11.W hat is the solution concentration formed from 2.1 moles BaCl

2 dissolved into 1.9 L of water? (please show work)

12.H ow many moles of solute are present in 1.4

L of a 1.9 M (molar) solution?

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[PDF] Concentration-and-Molarity-PhET-Labs-KEY.pdf

Part 1: Dissolution and Saturation

Click on everything. Move all

Notice what

1.How does the concentration change as solid solute is added? ___________________________________

6.When a solution is saturated, and additional solid solute is added, what happens? _________________________________

7.Why do you think this is? _______________________________________________________________________________

8.How does adding this additional solute change the concentration of this saturated solution? _________________________

9.How does evaporation change the concentration of a saturated solution? ________________________________________

10.Adding a concentrated solution... describe a way to determine the concentration of the solution in the spigot. Write

11.Using your plan...how might you get that concentrated solution to become saturated? ____________

12.Does your plan work for all the other solutions too? __________ Why? / Why Not?_____________________

First, determine the

Part 5, if your instructor requires it)

Saturation

Saturation

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Liters of Solution

Molarity of

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Moles of

Compound (mol)

Liters of Solution

Molarity of

Solution (M)

1.0 .20 3.5 8.4

Conclusion Questions

1.Adding pure water to a saturated solution (with no solids) would cause the concentration of that solution to increase /

2.Adding pure water to a saturated solution (with some solids) would cause the concentration of that solution to initially

3.Adding a solid salt to a saturated solution causes the concentration of that solution to increase / decrease / remain the same.

4.Evaporation acting on an unsaturated solution causes the solution"s concentration to increase / decrease / remain the same.

5.Evaporation acting on a saturated solution causes the solution"s concentration to increase / decrease / remain the same.

7.Why does this happen? (hint...think about the molecules) ___________________________________________________

4) into 500 mL of water? _________ Why? / Why not?

4? _________ Why? / Why not? (please show work)

2 dissolved into 1.9 L of water? (please show work)

L of a 1.9 M (molar) solution?

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