This lab illustrates how supersaturated solutions are prepared, and the process of crystallization. This lab can be done with a number of different salts. You will need to allow your solutions to sit for at least three weeks. This is one way to make rock candy. Be SURE to start this lab with plenty of time to finish. Materials -string -pencils -glass drink bottles -various salts (choose from the following list.) -table salt, sodium chloride -alum -baking soda -copper sulfate -sugar ( not a salt, but it does make pretty crystals) Epson's salts Procedure: Perform this procedure with sugar and any two other solids from the list above. You will need one bottle for each solid you make crystals with. 1. Pour a clean glass drink bottle of water into a microwaveable bowl and dissolve as much sugar or other solid as you can at room temperature. Warm the solution and keep adding sugar or other solid until no more will dissolve. At this point you will have prepared a supersaturated solution. 2. While the solution is still warm, pour it back into the clean glass drink bottle. 3. Tie string around a pencil so that about 4 inches of the string dangles from the it. 4. Place the pencil over the mouth of the bottle so that the string hangs in the solution. 5. Set your bottles of supersaturated solutions aside in an area where they will not be disturbed for at least one week. 6. After a week, lift the string out of the solution and observe the crystal formation. Take a digital picture of each solution's crystals. 7. Allow the bottles to sit for another week and take pictures of the crystals again. 8. After a third week check to see how much your crystals have grown. You can continue allowing the solutions to sit and grow larger crystals for longer if you want to see just how big they can get. You lab report should discuss the differences between unsaturated, saturated and supersaturated solutions. Describe what you did, what you saw, and the meaning of your observations. Be sure to include digital pictures that show the progressive growth of your crystals. AND make sure YOU are in at least one of these pics. This is a slow process, but your patience will be rewarded by some beautiful crystals. The copper sulfate crystals are a striking clear blue color.
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This lab illustrates how supersaturated solutions are prepared, and the process of crystallization. This lab can...
3. Crystallization begins with a process called nucleation, where particles of the substance dissolved in solution begin to aggregate. Crystals then begin to form on these aggregates. Based on this, explain why Steps 3 and 4 in Part III may induce crystallization. Part II: Observations Upuy Describe qualitative changes to solution - Solution went from bright yellow, orange to a mare dacu Orange /ced - hydrogen peroxide is originally clear but tuck's oldcu in the solution. The addition of hydrogen...
i need help answering the questions plz and thanks! Experiment 9 Report Sheet: Calculations and Questions Calculations 1. Determine which of the two starting materials is the limiting reagent, then determine the theoretical yield of [Cu(NH3)]SO4+H20. 2. Determine the percent yield after the first crystallization. Is this a valid percent yield? Explain. 3. Determine the percent yield of the second crystallization. Conclusion On the back of this page write a conclusion that comments on what you were trying to accomplish...
The first picture is used for question #2, and question #3 can be normally answered. I believe the answer to question 3 is -> 0.07144M. However I would like someone to check it. I am not sure about 2. BE SURE THAT YOU RECORD ALL OF YOUR DATA AND LABEL PROPERLY FOR PARTI OF THIS LABORATORY EXPERIMENT. YOU WILL NEED TO ACCESS THIS INFORMATION IN THREE WEEKS. Part I Synthesis of the Complex Salt containing Copper Procedure 16.004 1. In...
how do you do this ? Some Calculations You started out with a known amount of harium chloride and sodium sulfate. How much solid product should you collect? Show your calculations. How much did you collect? What is your percent yield? Which reactant should be the limiting reagent? Which reactant should be the excess reagent? Proving the identity of the Limiting and Excess Reagents There are two scenarios for the identity of the contents of the beaker containing the filtrate....
I need help calculating theoretical yield for my Diels-Alder lab experiment. This reaction was between 1,3-butadiene and maleic anhydride, forming cis 1,2,3,6-tetrahydrophthalic anhydride. In this experiment 1.0g of maleic anhydride was combined with 1.8g 3-sulfolene and 2 mL dry xylene and refluxed for 30 mins. 6 mL of xylene was added to dissolve solids and then decanted, then warm pet. ether was added to form crystalline product after cooling. some of this info may be irrelevant in what is needed...
can someone fill in the blanks? Procedure: (1) Reaction between sodium iodide and lead (II) nitrate: Note the appearance 1. Weigh approximately 3.55 g of Nal (0.0237) and place it in the 100 beaker. Record the exact mass in the data table below. Note the a of the Nal crystals in the observation section. 2. Add 30 mL of distilled water to the beaker containing the Nal crystals. S the solution until all of the Nal crystals have dissolved. Record...
How do I calculate the concentrations for my data sheet lab. I have not started my lab yet but I just need to see how i would calculate it with absorbance. Do i just use Beer's law or is there any other method of solving the concentrations. 7. Weigh 1.45-1.55 g of copper(I) sulfate pentahydrate in a 50 mL beaker. 8. Dissolve the copper(II) sulfate pentahydrate in -15 mL of water 9. Add the aqueous solution of copper(II) to a...
Extraction of solids: Experiment outlined below Draw a “roadmap” of the experiment, containing chemical structures and “layers” (organic and aqueous). This should contain the individual reactions occurring in each step, and show which layer the various components are present. Make sure you think about whether the acetaminophen, caffeine and aspirin are neutral, protonated or deprotonated. Preliminary separation obtain a sample (1.0g) of the mixture. weigh the sample and record it. this sample should consist of a 2:1:1 mixture (by mass)...
equation 4 = MNaOH = mKHP/(MWKHP(V2 ? V1)NaOH) Write the equation and determine all the partial derivatives that are used to calculate the uncertainty (error) in the NaOH concentration? Be sure to use eq(4). the question is number 8 on the pictures! Numer 8 please, I dont need any of the other questions Experiment 3 -Preparing and Standardizing NaOH The goals are (1) to prepare and standardize a sodium hydroxide solution that is in a range of 0.095-0.11 M, (2)...
1.) What side reactions occur during the following steps. 2.) How can the IR spectrum be used to show that there is not starting material left and the products are ketones? 3.) Describe the major differences and similarities between the IR spectra of benzoin and benzil. Compare your IR spectrum with those of benzoin and benzil. Copper-Catalyzed Oxidation of Benzoin 1. Add a stir bar and 1.5 mL of glacial acetic acid, 0.250 g of NH4NO3 and 0.500 g of...