Lab Report Template Makea Concentration Seriesof Solutions PDF

Preview

Summary

Lab report...

Description

Make a Concentration Series of Solutions By: Matelyn Booth November 14th, 2018

Purpose: The purpose of this lab is to make a set of standard solutions to measure concentrations of unknown solutions.

Materials: 5 clear cups, Kool Aid, Teaspoon, Water, and Dry Erase Board Procedure: I will first create 5 different solutions using Kool Aid and water. I will then calculate each concentration by determining molarity and volume. Finally I will see if I have achieved ppm concentration for my fifth solution, and if I haven’t I will describe the steps I would take to reach the ppm concentration. Analysis and Data (40 pt): Part A: So I started out creating my mother solution, I did that by dumping a packet of Kool Aid to the cup. The mass of the Kool Aid 4.5 grams. The next step I did was finding the molar mass of the sugar which is C12H22O11. So I took carbon 12 * 12 + hydrogen 22 * 1+ oxygen 11 * 16 = 342.34 grams per mol. The next step was finding the mol of the solid so I took the mass of the Kool Aid, which was 4.5 grams * 1 mol over 342.34 grams per mol which = 0.13 grams per mol. I then, added 150 ml of water to my mother solution so at that point I have the water and Kool Aid mix. The next step was to find the molarity, so I took 0.13 mol and divided by 150 ml but I had to covert that to liters so it was 0.150 liters, the answer to that was 0.086 molarity for the mother solution. So step one, was I transferred 25 ml to my mother solution to container one and added 150 ml of water. The dilution equation was 0.086 from the molarity of the mother solution times 25 ml, which is the amount transferred and then divided by 175, which was the amount of Kool Aid and water mix and it equals 0.012 and that is the molarity for container number 1. I then, transferred 50 ml from solution number 1 into solution number 2 and added 150 ml of water, for a total of 200 ml of water. The dilution equation for container 2 was 0.012 times 50 ml divided by 200 ml and the molarity was 0.003. The next step, was transferring 75 ml to solution number 3 and then I added 100 ml of water the dilution equation for that was 0.003 molarity times 75 ml, which was the amount transferred then divided by 175 ml, which was the total amount of water and the molarity of that 0.001. Now the last step, I took was I transferred 100 ml from solution number 3 and I added 200 ml of water for a total of 300 ml. The dilution equation for this solution was 0.001 times 100ml divided by 300 ml, which was the amount of water. The molarity I found 0.003.

Part B: Analysis Questions

1. My solutions are drinkable by people since it is just Kool Aid and water. I was challenged to achieve a ppm level however I wasn’t able to. a. Units are in milligrams per liter (mg/L) unless noted otherwise. Milligrams per liter are equivalent to parts per million (PPM). b. Trans- 1,2 Dichloroethylene, Endothall, Styrene, Tetrachloroethylene, Vinyl Chloride, Pentachlorophenol c. I know the goal was finding a molarity of 0.001 which is ppm. But I figured if I continued to add more water it would dilute my final solution, it would take anywhere from 5 to 7 steps of adding water. I think almost a 1000 ml of water would get me pretty close to ppm. 2. I think the resulting solution would have a lower molarity than my previous solutions. a. The volume measurement of the container holding the mother solution is less than you use in the calculation. HIGHER | LOWER (pick one) b. You spill a small amount of mother solution as you transfer it to the container for the #2 solution. What is the impact on the #2 solution concentration? HIGHER | LOWER (pick one) c. You incorrectly convert from teaspoons to milliliters and the resulting value is too low. HIGHER | LOWER (pick one)

Summary (5 pt ea = 20 pt): (1) What did you do? A serial dilution of sucrose. (2) What were your results? As the molarity of the mother solution decreases, color also decreases. (3) Analyze your results including sources of error: Sources of error can come from any spillage of water added. (4) What did you learn? The dilution factor can be replicated to the end, and any trace of the mother solution will disappear....