As before, test the egg in each cup, starting with the lowest salt concentration. In which cup did the egg float first? 9. If you want, make another dilution series, with even smaller steps, to improve the precision of your estimate. 10.
Osmosis/Egg Lab By: Nicole Dressen Problem to Solve: How the mass of an egg changes in different substances. Information Collected: A. Hypotonic: a substance with lower concentration when compared to another substance. B. Isotonic: when the concentration of two substances is the same. C. Hypertonic: a substance with more concentration when compared to another substance. Hypothesis: I think the mass of the egg that is in the water will stay the same but the mass of the egg that is in the sugar will increase mass.
The solution was then drained into an Erlenmeyer flask and I recorded the weight of the flask before (W1) and after the solution (W2) and then subtract the weight of the flask with the solution from the weight of the flask alone in order to find the absolute mass of the solution (W3). I repeated these steps 2 times. In order to find the density (D) of the solution I took the mass of the solution (∆W) and divided it by volume of the solution in the buret. I then averaged the two densities and found that the average density for the egg to float is 1.05g/mL. | 1st | 2nd | | Buret volume: 24mL | Buret volume: 24.1mL | W2 | 141.87g | 141.83g | W1 | 115.18g | 116.15g | ∆W = W2 – W1 | 25.06g | 25.37g | D = ∆W/buret volume | 1.04g/mL | 1.06g/mL | Average Density = 1.04 + 1.06 / 2 = 1.05 | I repeated the same process for the Mohr pipet as I did for the Buret.
For every 20 drops of solution you will add 0.1g of zinc to the new test tube. Repeat steps 3 and four until the solution is clear. If there ever exists too little of the solution to get enough drops, add up to 1mL of distilled water to the solution. 4. Once the solution is clear, retrieve at least ten drops of the solution and place them in a new test tube.
Materials and Methods Part 1 For the cation elimination test first 10 drops of potassium, iron (III), zinc (II), copper (II), and cobalt (II) were added to 5 centrifuge tubes and the color was recorded. Then for the metal hydroxide test, 6 M NaOH was added drop wise till a precipitate was formed. Each solution except potassium formed a precipitate, so then 10 additional drops of NaOH were added to the remaining solutions. Tubes were cleaned with distilled water and 6 M HCL. Next was the ammonia test 10 drops of each metal solution were added to new centrifuge tubes and 15 M NH4OH was added until the solution changed color or a precipitate was formed.
Part C: Density of Sodium Chloride (NaCl) Solution, a sample of NaCl was obtained and measured using a 100mL beaker and a 10mL pipet to determine the concentration of the solution. In order to obtain the appropriate result, a calibration graph and density measurement was used to determine the concentration of the sodium chloride solution. In conclusion, based on the water temperature of 21.8°C in part A’s graduated cylinder experiment obtained, it was determined that the average density was .0973g/mL with a percentage error of 2.5%. When graphed the measurement was equal to Y=0.988x. Part B: The graduated pipet’s average density at 22.3 °C was determined to be 0.9785g/mL with a percentage error of 1.89% shows the graduated pipet to be more accurate and precise.
Eggsellent Lab Analysis Questions 1. Draw and label two pictures - Initial and Final - showing the movement of food coloring molecules. You must use all of the following words: high concentration, low concentration, diffusion, and cell membrane 1. Draw the egg after it has been in the food coloring for 24 hours. Explain what might have occurred (be sure to explain what conditions had to exist both inside and outside the egg)using all of the following terms: diffusion, semi-permeable membrane, high concentration, low concentration.
Haocheng Zhen Aron Jouvenet John Cureg Date: 5/20/2014 Egg Drop Competition Lab Abstract: The Goal for the lab is to design and build a contraption that can protect 1 large Grade AA raw egg from breaking when it is dropped from the second floor balcony of the Pg Bldg at Citrus College. At the Day 1 we design the first contraption, and find the physics behind contraption. At the day 2, we test the prototype, and if the egg broke, we should adjust it. After the adjustment, we measure the mass, height of drop, and time in flight of the contraption. We did the calculation after we finished the measurement and adjustment.
Steven Young Mr. Greytak Block 4 17 September 2012 Title: Water vs. Baby Oil Objective: In this lab, the goal that is trying to be determined is the density of water compared to baby oil. Procedure: We started out by pouring water in a graduated cylinder and finding the volume. Next, we measured the weight on a scale in grams. The baby oil was found by pouring it in a graduated cylinder to find the volume. Finally, we stuck it on the scale to find the weight.
(each time record the number of drops placed in the wells) Data: Analysis: a. CuCl+ NaOH -> NaCl+ CuOH b. CuCl2+2NaOH -> Cu(OH)2+2NaCl c. FeCl2+2NaOH -> Fe(OH)2+2NaCl d. FeCl3+3NaOH-> Fe(OH)3+3NaCl 1. The average number of drops of sodium chloride needed to react with copper chloride was 11 drops. 2. For the sodium hydroxide to react with the Iron Chloride, it took on average 21 drops of sodium hydroxide into the Iron Chloride. 3.