Nest two Styrofoam cups within one another 2. Turn on magnetic stirrer 3. Insert probe into cardboard lid 4. Pour 25mL of water into calorimeter 5. Determine initial temperature of water 6.
Allow the mixture to cool for a few minutes then filter it, using either gravity or vacuum filtration. (We shall be using vacuum filtration.) Wash the residue in the funnel once with a little water and collect all the filtrate. 4. Pour all the filtrate and washings into a 250cm3 volumetric flask.
total), stir and record temperature. Trial 2: 1. 2 cups of water will be heated until temperature stops rising and that temperature will be recorded. 2. Add ½ tsp.
Experimental First, we weighed 2 samples, each has 1 gram of NaHCO3-KCl mixture Second, we put the samples in 2 crucibles (A and B) and weighed them. (crucible + sample; WA1 and WB1) Third, we heated both samples on a hot plate for 30 minutes. Fourth, we weighed the samples again (crucible + sample; WA2 and WB2) Lastly, we determined NaHCU3 percentage in the mixture using the following method: WA1 – WA2 x 100% 0.309 WA1 – WA2 x 100% 0.309 * * Results * Theorectically: * Discussion When sodium hydrogen carbonate is heated, new products are formed; sodium carbonate, water vapor, and carbon dioxide gas. This reaction may be presented in a different form with a measure of molecules: @Na2CO3 + H2O + CO2 (solid) (solid) (gas) (gas). Once the reaction of sodium hydrogen carbonate takes place, carbon dioxide gas is released, as well as water vapor.
Add 1 mL of deionized water to the small test tube containing the precipitate and mix it and centrifuge it for 60 seconds. Then, add the supernatant into the boiling test tube and repeat this step one more time with another 1 mL of deionized water. Acquire a pair of metal test tube holders and heat the boiling test tube to evaporate the water for 15 minutes. Let is cool after and weigh it. Then, calculate a percent yield of zinc iodide and write a balanced chemical equation and determine the limiting
After swirling for 1 minute more precipitate was formed. Action | Result | 2 mL of water was added to the boiling tube with zinc iodide solution and excess zinc. The tube was swirled | Very little precipitate was formed | 5 mL of water was added to the boiling tube, which contained zinc iodide
Observing Changes – Materials & Procedures Materials Water Copper (II) sulphate (Powder) Copper (II) sulphate solution Iron nail Sodium carbonate Hydrochloric acid Magnesium ribbon Flame (candle) Sugar Aluminum foil Test tubes Test tube rack Tongs Medicine dropper Spoons Beakers Safety goggles Scoopulas Procedures Water and Copper (II) Sulphate Procedure 1. Add a small amount of solid copper (II) sulphate to a test tube with a scoopula. Record the physical properties. 2. Write a hypothesis on what you think will happen when water is added.
UNCW Honors Chemistry Lab #1- Laboratory Safety and Boiling Water Date Started: 8/26/11__________________ Date Completed __________________ Purpose: To determine the temperature at which water boils. To learn how boiling and melting are physical changes. Background Information/Observations: 1) Explain the most common scenario when you observe water boiling. 2) Explain how you could change the rate at which water boils. 3) Explain how you could change the temperature at which water boils.
Safety Considerations. Cold crucibles look the same as hot ones. We heated the hydrate gently at first because the water formed can sputter. Procedures. At first we dried the crucible in the flame three times and let it come to a constant mass by measuring the weight each time.
Pour the water in the graduated cylinder in to a soft drink can. Then set up the ring stand. Hang the soft drink can on the ring of the ring stand using a glass rod. Set the ring to about 3cm above the can. Put on a safety goggles.