6.03 Calorimetry Lab Report

Procedure: I used a ruler, thermometer, and scale to take measurements. I used a graduated cylinder, short step pipet, scale, and ruler to determine volume and density. I used a volumetric flask, graduated pipet, pipet bulb, scale, and glass beaker to determine concentrations and densities of various dilutions.

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You will then pour half of the graduated cylinders contents (20ml) into each of the 2 medium beakers.

1 I measured the temperature of NaCIO solution and “solution B” (using the same thermometer; temperature of solutions were equal). Then recorded my data in the table.

| Different concentrations of sucrose solution (specifically, 0.25mol/dm³, 0.5mol/dm³, 0.75mol/dm³and 1.00ml/dm³) and distilled water (0.00mol/dm³) will be used.

* By using the dropper and measuring cylinder, 7 ml sodium carbonate solution was added to the test tube

The goal of this lab was to make a NaCl^ solution and calculate its molarity so that students can become acquainted with “volumetric glassware, the balances and quantitative transferring of liquids.” 25 mL of NaCl solution was completely transferred with AgNO_3 solution test and the molarities of the original 25 mL and diluted 250 mL solutions were calculated.

Beaker A was filled with half warm water and half ice so the temperature was at 10˚C

Record all my result in a suitable table stating their initial mass, final mass, mass change and percentage mass change.

The 0.0 M to 0.2 M sucrose solutions remained positive on the graph in figure one, while steadily approaching 0.00% mass difference. When the concentrations were 0.3 M to 0.5 M sucrose the percent mass difference became negative, decreasing continuously. As shown in Figure 1, the control 0.0 M sucrose solution yielded the highest percent mass difference (13.24%). From there, the percent difference in mass continually decreased in the treatment sucrose solutions; 0.1 M yielded a 4.76% difference, 0.2 M yielded a 2.08% difference, 0.3 M yielded a -6.56% difference, 0.4 M yielded a -15.63% difference, and 0.5 M yielded a -20% difference. Between the 0.2 M and 0.3 M treatments, the percent difference in mass became negative (the linear trendline

The molar mass, the number of moles in the sample, and the number of representative particles in the sample were also recorded.

Set up support stand with support ring and wire gauze for the purpose of heating water. Fill 400 mL beaker half way with tap water. Place it on the wire gauze over the burner. While it heats, weigh your dry test tube with a cor to 0.01g and record. Fill the test tube and metal in the beaker of water and it it boil. The Cork is used

5. Add the 40cm3 of HCl to the NaOH solution, close the calorimeter with the lid (making sure that the thermometer sticks through the hole) and start the stopwatch

We will put a drop or two of oil on top of each solution to stop fungus and bacteria colonies developing on the surface. Because it was not oiled in the pre-test, bacteria from the air landed on the solution and started to multiply, feeding on the solution, in turn making the experiment inaccurate.

5) 5 mL of sugar was added to the solution and a balloon was placed over the opening of the bottle to minimize the loss of any gas from the system.