Intro to Chem Collective Virtual Labs and Scavenger Hunt (Blackwell Covington) PDF

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Intro to ChemCollective Virtual Labs Will Blackwell and Megan Covington This activity will introduce you to the ChemCollective Virtual Lab platform and help familiarize you with some of its capabilities. 1. View the video at the following link. It provides an overview of some of the things you can do in the Virtual Lab: https://youtu.be/Nwjhk9rkubY. Pay particular attention to the different ways you can transfer liquids between containers and the options available in the Information viewer panel in the virtual workbench. 2. Access the Default Lab at the following link: http://chemcollective.org/activities/vlab/1. 3. Find and add to your workbench: distilled water, solid sodium chloride, a beaker, the scale, and a weigh boat. a. Place the weigh boat onto the scale. What is its mass? 5.9612g b. Click TARE on the scale and then add 2.34 g of sodium chloride to the weigh boat. What is the mass reading on the scale? (Be sure to include ALL digits in the digital readout of the scale!) 2.3400g c. Click the options button ( ) in the Information panel and make sure Solid Species Viewer is selected. What is the mass of sodium chloride in the weigh boat? 2.3400g d. Take the weigh boat off the scale, and drag it onto the beaker to transfer the sodium chloride. Use the Solid Species Viewer to confirm transfer. e. Add 5mL of distilled water to the beaker. Look in the Information panel. What is happening to the: i. Concentration (Molarity) of Na+: The molarity of Na+ is increasing. ii. Concentration (Molarity) of Cl-: The molarity of Cl- is increasing. iii. Mass of NaCl: The mass of NaCl decreases. f. Add 20mL more distilled water. What is the: i. Final volume in the beaker: 25.000 mL ii. Final concentration (Molarity) of Na+:

1.60164 iii. Final concentration (Molarity) of Cl-: 1.60164 4. Right click a blank area of your workbench and select Clear Workbench. Then add to your workbench: 10M HCl, 1M NaOH, a beaker, and a foam cup. Make sure you are paying attention to the Information panel before (and while) completing the following steps: a. Add 50mL of 1M NaOH to the beaker. b. Add 50mL of 10M HCl to the beaker. i. What happens to the temperature? The temperature shoots up and then steadily decreases ii. Is there a maximum or minimum temperature you observe? And if so, what is it? The maximum temperature is 30 ℃ and the minimum is 25 ℃ c. Do the same experiment with the foam cup: put 50mL of 1M NaOH into the foam cup, then add 50mL of 10M HCl. i. What happens to the temperature? The temperature stays steady at 31.7 ℃ ii. Is there a maximum or minimum temperature you observe? And if so, what is it? The maximum observed temperature is 31.7 ℃. d. If you have an empty container(s) (for example, from HCl or NaOH), right-click the container(s) and select Remove to clear it from your workbench. e. Place a new beaker on your benchtop. f. Right-click the empty beaker and select Thermal Properties. Click the Insulated from surroundings checkbox and then click OK. g. Now, let’s perform the same experiment as before in this insulated beaker. i. Add 50mL of 1M NaOH to the beaker. ii. Add 50mL of 10M HCl to the beaker. 1. What happens to the temperature? The temperature shot up to 31.7℃ and maintained that temperature. 2. Is there a maximum or minimum temperature you observe? And if so, what is it? The maximum temperature observed is 31.7℃ 5. For the rest of this activity, you will need to find equipment, glassware, and chemicals and answer some questions. Remember: your workbench has a finite capacity – if you see a Workbench full! Message you will need to remove items

from your workbench (by right-clicking any unneeded items) or clear the workbench. a. Add a 10mL graduated cylinder to your workbench. Add distilled water using Realistic mode, click Hold to Pour until no more water can be added. i. How much water is in the graduated cylinder? 10.960mL ii. Right-click the graduated cylinder and select Detail View. Can you see the meniscus? Right-click the graduated cylinder and select Remove Liquid to empty. No. iii. In the ChemCollective virtual lab workbench, the container you are dispensing from influences how quickly material is transferred (when using Realistic mode). Experiment with other glassware until you find an option that allows you to use Realistic mode to add ~5-7mL of water to the 10mL graduated cylinder. 1. What glassware did you try? The 5 mL pipette. 2. Write a short procedure describing the steps you used to add water to the graduated cylinder without overfilling using Realistic mode. 1. Pour water from the water jug into a 50mL graduated cylinder. 2. Use the 5 mL pipette to transfer the water from the 50 mL graduated cylinder to the 10mL graduated cylinder. 3. Take a picture or screenshot of the Detail View and the Information panel of the graduated cylinder. Insert the image in the box below. (Use the Insert >> Image item from the Google Docs menu to insert your image)

b. How many beakers are available? What size(s) are they? How much does each weigh? 3 beakers total are available. 250 mL, 600 mL, and 1000 mL beakers are available. The 250 mL weighs 102.3044g, the 600 mL weighs 235.0518g, and the 1000 mL weighs 235.0518g.

c. Find a 10mL Pipette. Starting with an empty workbench, describe the steps you need to perform to add 10.00mL of distilled water to an Erlenmeyer flask. First, add a 10mL pipette, the 3.0 L of distilled water, a graduated cylinder larger than 10mL, and an erlenmeyer flask to the workbench. Next, pour as close to 10mL of water as possible from the water into the graduated cylinder. Use the pipette to siphon 10mL of water and transfer it from the graduated cylinder to the erlenmeyer flask. d. Select 2 weak bases. What are they, and what is the pH of each? 3 M NH3: pH of 11.86

0.5 M Mg(OH)2: pH of 10.35

e. Find the 1M sodium carbonate solution. i. Use the scale to find the mass of 50mL of 1M sodium carbonate solution. 55.3 grams ii. Remember that density is the ratio of mass to volume for a sample. What is the density of 1M sodium carbonate? Be sure to include appropriate units! 1.11g/mL

f. Describe the steps required to collect data to measure the density of distilled water. What density were you able to calculate for distilled water? 1. Use a 250mL beaker and put it onto the scale, then tare the scale so the weight of the beaker doesn’t affect the mass of 50.00 mL of water. 2. pour 50.00 mL of distilled water into the beaker and weigh the water. The weight of 50.00mL of water is 50.00 grams. 3. The calculations would be density=mass/volume density=50.00/50.00, so the density would be 1 g/mL...