CHM 101Acids & Bases Solution Concentration & Types of Mixtures Worksheet
CHM 101Acids & Bases Solution Concentration & Types of Mixtures Worksheet
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By using the attached links, this assignment requires you to answer analysis questions on solution concentrations and types of mixtures. Additionally, there are a few basic chemical math problems and it requires you to conduct a small experiments in order to identify solutions, colloids, and mixtures. All the links needed to complete the assignment are included below.
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CHM-101L Solution Concentration and Types of Mixtures
Concentration
Use the “Concentration” simulation provided in the topic materials. Add some of the solute (drink mix) to the water sample by shaking the container. What happens to the color of the solution as more and more drink solution is added? Hit the button that removes the solute. Click and drag the concentration meter over to the liquid. What is the concentration of the liquid before any of the solute is added? Add enough drink mix to bring the concentration to approximately 1.500 mol/L. Record the exact value of the concentration of the mixture and the volume of water present.
Now add water by clicking on the blue nozzle on the top water faucet in approximately 0.10 L increments up to the point where the overall mixture volume is 1.00 L. Record the concentration and the new volume of the mixture after each addition. Finally, determine what happens to the concentration of the solution when the solvent is evaporated off. To do this, slide the blue tab on the evaporation tab to the right. Evaporate slowly in 0.10L increments until you have completely evaporated off all the solvent in the solution. Record each of these measurements on the table below.
Addition of Water Evaporation of Water
Volume Concentration Volume Concentration
1) Describe the changes in concentration in each of the three scenarios:
a. When solute was added to a continuous amount of solvent.
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b. When solvent was added to a continuous amount of solute.
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c. When solvent was evaporated away from a continuous amount of solute.
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2) As you evaporated the solvent away from the mixture, was there a point at which visible particles of the solute were present? If so, explain why this occurred.
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Solve the following concentration of solution problems:
3) What is the % M/M of copper in an alloy when 10 kg of Cu is mixed with 250 kg of Zn?
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4) If I make a solution by adding water to 75 mL of ethanol until the total volume of the solution is 375 mL, what’s the percent by volume of ethanol in the solution?
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5) How would you make 500mL of 30% vinegar in water solution?
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6) What is the molarity of the solution that contains 0.5 moles of calcium chloride in 485 mL of solution?
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7) What is the molarity of a solution that contains 2.5 grams of magnesium sulfate in 25 mL of solution?
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8) How much dissolved nitric acid is in 2L of 2.3 M nitric acid?
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9) The initial concentration of the solution H2SO4 is 18 M. What would the volume of the initial stock solution (V1) need to be if the concentration was being changed to 0.4 M of a 1 L solution?
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10) The initial concentration of the solution HCl is 12 M. What would the volume of the initial stock solution (V1) need to be if the concentration was being changed to 1.1 M of a 500-mL solution?
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Types of Mixtures – Solutions, Colloids and Suspensions
Obtain the following materials
• 3 small (approximately 8 oz) clear drinking glasses
• Salt
• Pepper
• Milk
• Laser pointer or small flashlight
• Coffee filters
• 3 spoons
After watching “Solution, Suspension and Colloid,” provided in the topic materials, complete the following experiment and identify each mixture as a solution, a colloid, or a suspension. Fill each of the glasses ¾ full of water. Into the first glass add 1 tablespoon of salt, into the second glass, add 1 tablespoon of pepper, and into the third glass, add 2 tablespoons of milk. Stir each mixture. Record your observations below. Using a laser pointer or a small flashlight, shine a beam of light through each stirred sample. If the particle size of the particles in the mixture are large enough, they will scatter the light, causing the mixture to display the Tyndall Effect. Record your observations in the table.
Finally, take each mixture and pour through a coffee filter. The particles of a solution and a colloid are small enough that they will pass through the filter. For a suspension, the particles are large enough that they will be able to be trapped by the filter. Record your observations below.
Substance Appearance after mixed with water Tyndall Effect Separates upon standing Particles can be captured by a filter
Salt
Pepper
Milk
1) In your own words, how would you distinguish between a solution, a colloid, and a suspension?
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2) Pharmaceuticals can be administered as either solutions, colloids, or suspensions. Give one example of a medication that is given as each type of mixture and explain the benefits of that type of mixture as the method of delivery.
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Diffusion and Osmosis
After viewing “Osmosis and Water Potential” and “Diffusion,” provided in the topic materials, complete the table by writing whether solutes and water move INSIDE or OUTSIDE the cell.
DiffusionOsmosis
Does the solute move inside or outside of the cell? Does water move inside or outside of the cell? Intracellular fluid Extracellular fluid
5% salt10% salt
8% salt8% salt
3% glucose0.5% glucose
14% water22% water
3) Total parenteral nutrition (TPN) is a method of getting an individual nutrition that bypasses the gastrointestinal tract. Nutrient rich fluid is given directly through a central line, an IV that goes into a large blood vessel near the center of the body. Research and explain why TPN can only go in a central line, and how its delivery method is governed by the processes of osmosis and diffusion.
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