GC Freezing Point Depression of Water Discussion

Description

Instructions

For this discussion board, pick one of the activities below:

1. Freezing point depression of water: Gather an ice cube tray, water, salt, and sugar. Creating different combinations of salt and sugar, add the mixtures to some ice cube trays (you only need ~1tbsp for each well). For example, you could use 100% salt, 25/75 salt/sugar, 50/50 salt/sugar, 75/25 salt/sugar, and 100% sugar. Pour the same amount of water in each cube tray holder and mix as best as you can. Also, make sure you have a control in the experiment by having an ice cube tray with only water in one well. Put the ice tray in the freezer and wait until everything is frozen. Take out each ice cube set (sugar, salt, and normal water) and start timing the rate at which each ice cube melts. What happens? Which melts first? Take a before/after picture or video of your experiment and describe your results using colligative properties and freezing point depression.

2. Making Ice Cream in a Bag: Gather 1/4 cup sugar, 1/2 cup milk, 1/2 cup whipping cream, and 1/4 teaspoon vanilla to the quart zipper bag. Seal the bag securely. Put 2 cups of ice into the gallon plastic bag.Add 1/2 to 3/4 cup salt to the bag of ice. Please review the Thought.co protocol provided (Links to an external site.). What happens? Take a before/after picture or video of your experiment and describe your results using colligative properties and freezing point depression.

3. Borax Crystal: (Video Tutorial from Spangler Science): (Links to an external site.) Gather a Mason Jar, Pipe cleaner, String, Pencil, Water, Borax (or sugar or salt), and Food coloring (optional). You can use granular sugar or salt instead of Borax. Please review the Thought.co protocol provided. (Links to an external site.) Allow the solution to sit undisturbed overnight. What happens? Take a before/after picture or video of your experiment and describe your results using supersaturated solutions. Please be sure to follow proper safety here and prepare the solution in a well vented area.

4. PhET Simulation for Molarity (found through PhET website) (Links to an external site.). Select different solute and solvent ratios. Take a screenshot of two different solutions you make, and why the solution has different colors (or intensities)

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