Ethylenediamine Reaction Lab Report

Purpose The purpose of this lab was to measure the temperature of a solution to see how much energy was gained/lose during the reaction between the NiCl2 and Ethylenediamine. In this experiment we were also finding how many Ethylenediamine will bind to Ni+2 in an aqueous solution. By measuring the change in evolved heat, it’s possible to find the maximum number of Ethylenediamine molecules that have attached to each ion.

Procedure
Gather materials
Analytic Balance
Pasco with temperature probe
Styrofoam cup
Tape
5 M Ethylenediamine
0.998 M NiCl2
10 mL Pipet
2 mL Pipet
Pipette 10 mL of NiCl2 into the styrofoam cup, making sure the sensor is submerged
Press the play button on the Pasco data logger
Pipette 2 mL of the Ethylenediamine into the

Trial 2
Figure 2

Figures 2 shows the change in temperature when the ratio between the reaction of NiCl2 and Ethylenediamine increases. Around 130 seconds the graph starts to plateau, this is because there are no more bonds to bind with and the liquid added is colder than the solution itself. When the Ethylenediamine was added, the reaction turned a blue/purple color.

Trial 2
Figure 3

Figure 3 shows the trendline and the slope each time another 2 mL of Ethylenediamine was added to the mixture. In addition, Trial 1 had similar findings, however, only Trial 2 is shown above because the data was easier to manipulate in order to make the trendlines.

(TALK ABOUT CHANGE IN ENTHALPY see page..) From the data collected on the Pasco Logger, each trial showed three different trendlines for each mole ratio, however, the fourth ratio didn’t increase like previous three ratios did. This is because there wasn’t anymore bonds to bind to, therefore, only three Ethylenediamine will bind to Ni+2 in an aqueous solution.
After reexamining the experiment, there is a source of error that may have affected our results. Experimentally the energy gained/lose during the reaction was (INSERT ENTHALPY ANSWER). However, this number isn’t entirely correct because the heat loss in air wasn’t taken account for. A solution to this error could have been covering the Styrofoam cup.