Enthalpy of Dehydration of Sodium Acetate Trihydrate
In this lab, two solid substances, sodium acetate and sodium acetate trihydrate, will be analyzed for the heat of solution for both processes. This allowed the calculation of the molar enthalpy of dehydration of sodium acetate trihydrate. Calorimetry was used to experimentally determine the heat of solution for both reactions.
This lab was performed based on the procedure outlined in “Exp #7 Calorimetry.” No changes to the procedure were made.
Data and Observations:
All data and observations were recorded in the lab notebook. Pages from the lab notebook are attached to the lab.
The objective of the lab was to find the calorie content of Cheetos and marshmallows. To do this we needed to use a calorimeter. The hypothesis was that Cheetos would have more calories because they have more fat in them. The Cheetos and marshmallows were lit and put in an oatmeal can calorimeter. The temputure change in the water leads to finding the calories in food. Cheetos had about 3x the amount of calories at 1.66 calories per gram compared to marshmallows 0.57 calories per gram. With this…
This lab involves three separate experiments. Before you conduct any of them, however, you should put on goggles and aprons, as well as gloves.
For the first part, place the FeCl3 solution into the watch glass, and add a few drops of KSCN. Record any changes you might see. Then, ask Dr. Karraker to add a KSCN crystal to the watch glass, and again record any changes. Add drops of Na3PO3 and record any changes, then add FeCl3 and record those changes too. After you are done, dump the…
Brooke Beams February 2, 2012
Determination of the Components of a “Mixed Drink”
INTRODUCTION. For this experiment standard solutions of Kool-Aid flavors will be prepared to measure the absorbance at lambda max and plot the results against the concentration of solution to generate a standard curve. Then it must be determined the amount of each flavor in a sample of the unknown by comparison to your standard curves. The ingredient in each flavor of the Kool-Aid that…
Determining the Percentage Yield of a Chemical Reaction
What is the percentage yield of the reaction of sodium carbonate and calcium chloride dihydrate (the dihydrate must be included with the molar mass calculation)?
Predict the mass of sodium carbonate and calcium chloride dihydrate that will be required to produce 1.90 grams of calcium carbonate:
Therefore, the predicted mass of sodium carbonate is 2.0 grams and the predicted mass of…
1. 6 cleaned and dried conical flasks were collected and safely transported to the experimental table.
2. A black marker was used to mark a black cross on a white sheet of paper. This was to help with measuring the time (dependent variable).
3. A thermometer was placed on the table to measure the room temperature.
4. 0.15mol/L sodium thiosulphate solution (Na2S2O3) and 3mol/L hydrochloric acid (HCL) were poured into two separate 50 ml beakers, and the two beakers were transported to the…
In this experiment I will prepare a pure sample of an element (copper) by making a copper solution and then plating it out onto a more active metal.
HYPOTHESIS: Because Copper is a more active metal than Iron, I believe the copper solution will plate onto the iron nail.
PURPOSE: The purpose of this experiment is to observe reactions between metals depending on which one is more active and observe how to clean pennies, while making a copper solution.
Two plastic cups
In this experiment I have compared three different methods of determining the amount (percentage) of ethanol present in an aqueous sample. I tested three different samples containing different percentage amounts of ethanol in them; Listerine, Terra Fresca Wine and the last is a mixture of ethanol and water that was made by me. The three different methods compared are the redox titration method which involves the oxidation of ethanol to ethanoic acid and then titrating the residue with…
• 1x hot plate
• 1x electronic scales
• 4x 100mL beaker
• 4x glass stirring rod
• 4x thermometer
• 1x chemical spatula
• 500mL of deionised water
• 500g of sugar (sucrose – C12H22O11)
• 100g of salt (NaCl)
• 100g of copper sulphate pentahydrate (CuSO4•5H2O)
1. Fill a 100mL beaker with 50mL of water and then weigh it using electron scales and take note of the mass. Place the beaker on the hot plate, but don’t turn the hot plate on.
2. Place a thermometer in the beaker of water…
1. Two solutions, A. being 1.0 x HCl, and B. being 0.10 M will be given, as well as buffer solution 1 M NaOH.
2. Have 25 mL of solution A. and B. in two separate beakers.
3. Check the pH of both solutions without any NaOH first. Then begin checking pH after 1 drop, then after 10 drops, and lastly 25 drops. After each set of drops be sure to mix solutions.
4. Compare both sets of pH to determine which had an easier time resisting change.
C. Titration curves.
1. Insert NaOH into…