This was a lab I performed where we mix aqueous 25ml HCl and 25ml NaOH and use a program called microlab to determine the cooling rate after the initial heating. We used a coffee cup calorimeter that had a stirring bar. At first, NaOH solution is by itself in the coffee cup calorimeter. It’s temperature was 23.02 C. I waited for 70 seconds and then added the 25ml of HCl to it. The temperature rose to 29.59 C, then began to cool down immediately. The cooling rate was y=0.0089x+26.1273 according to the program. The final weight of the solution was 47.147g. The moles of NaOH was 0.919M and HCl was 1.033M. The questions: calculate the theoretical value for change in delta Hrxn.

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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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This was a lab I performed where we mix aqueous 25ml HCl and 25ml NaOH and use a program called microlab to determine the cooling rate after the initial heating. We used a coffee cup calorimeter that had a stirring bar. At first, NaOH solution is by itself in the coffee cup calorimeter. It’s temperature was 23.02 C. I waited for 70 seconds and then added the 25ml of HCl to it. The temperature rose to 29.59 C, then began to cool down immediately. The cooling rate was y=0.0089x+26.1273 according to the program. The final weight of the solution was 47.147g. The moles of NaOH was 0.919M and HCl was 1.033M.

The questions: calculate the theoretical value for change in delta Hrxn.

In this lab, you will experimentally determine AHn for the neutralization reaction of a strong acid
(HCI) with a strong base (NaOH) in solution,
HCI(aq) + NaOH(aq)
H;0() + NaCI(aq)
(5)
for which the net ionic equation is given by Equation 6.
H"(aq) + OH (aq)
H20(1)
(6)
For this reaction to occur, hydrogen and hydroxide ions must break their interactions with water and form
a covalent bond with each other. When this process occurs, energy is exchanged with the surrounding
solution, resulting in a temperature change in the solution. The change in the temperature of the solution
along with other information such as mass and specific heat capacity will allow you to calculate the
enthalpy of reaction for this process.
Transcribed Image Text:In this lab, you will experimentally determine AHn for the neutralization reaction of a strong acid (HCI) with a strong base (NaOH) in solution, HCI(aq) + NaOH(aq) H;0() + NaCI(aq) (5) for which the net ionic equation is given by Equation 6. H"(aq) + OH (aq) H20(1) (6) For this reaction to occur, hydrogen and hydroxide ions must break their interactions with water and form a covalent bond with each other. When this process occurs, energy is exchanged with the surrounding solution, resulting in a temperature change in the solution. The change in the temperature of the solution along with other information such as mass and specific heat capacity will allow you to calculate the enthalpy of reaction for this process.
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