CHEM 101 Franklin Pierce Calorimetry & Thermochemical Measurements Experiment 5 Lab Report Part I: a) Include the excel graph used to determine final temp

CHEM 101 Franklin Pierce Calorimetry & Thermochemical Measurements Experiment 5 Lab Report Part I:

a) Include the excel graph used to determine final temperature.

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b) Include a table showing the calorimeter constant

Part II:

a) Include the excel graph used to determine final temperature.

b) Include a table showing

The exp specific heats determined for copper and aluminum

The theoretical specific heats of copper and aluminum

The % error for specific heats of copper and aluminum

Part III:

a) Include the excel graph used to determine final temperature.

b) Include a table showing

The experimental △H neutralization

The theoretical △H neutralization

% error.

Limiting reagent

kJ/mol

(The lab procedure and my recordings directs to measure the temperature of cold water for 4 min and to include that in each of the graph.

The data that I sent you only has one averaged initial temperature for cold water so you do not need and can not graph that at any point.

So all graphs are simple and have one series of data and not 2 , with the y= temperature of mixture and the x= time from 1 to 5 minutes.

The trendline is linear and the equation will provide the Tfinal for mixture. )

The parenthesis Is correction my professor made to the lab

I added my data in the files.

https://cccconfer.zoom.us/rec/play/7pV7d-6upzs3E9aVtASDAPR-W47vLqis1yIe__EOnhnjWyMBMwb0M7EQZeV3Y3uRoXpHI93wWwArx8kE?continueMode=true&_x_zm_rtaid=9pHyXaJ7TJuMN3fNhGS00A.1587163755109.510a294995745110346370bb407cd3d7&_x_zm_rhtaid=342

this link explains how to do the lab. Table 1
Student
Part I (calorimeter
calibration)
A
Mass cups, empty (g)
5.089
Mass cups with cold water (g)
Mass water-to-be-heated and
beaker (g)
Mass beaker after hot water
transfer(g)
49.366
113.403
66.258
Copper
Part II (specific heat of metal)
Mass metal (g)
Mass cups with cold water (g)
49.017
91.097
Aluminum
Part II (specific heat of metal)
Part III (acid-base
neutralization)
Mass metal (g)
Mass cups with cold water (g)
39.041
113.408
Mass cups with NaOH (g)
Mass cups with acid + base,
post rxn (g)
NaOH molarity (mol/L)
HCl molarity (mol/L)
58.924
108.044
1.026
1.012
Part I
Time (min)
Temp (°C)
Temp of cold water or base in
styrafoam cups, before
mixing
0
20.0
Temp of hot item or acid,
before mixing
0
65.1
1
44.3
1.5
44.4
2
44.2
2.5
43.9
3
43.7
3.5
43.5
4
43.2
4.5
43.1
5
42.9
Temp calorimeter after
mixing hot item with cold
item (or acid with base)
Part II Copper
Time (min)
Temp of cold water or base in
styrafoam cups, before
mixing
0
21.2
Temp of hot item or acid,
before mixing
0
95.4
Temp calorimeter after
mixing hot item with cold
item (or acid with base)
1
1.5
2
2.5
3
3.5
4
4.5
5
25.1
25.3
25.2
25.2
25.2
25.2
25.2
25.2
25.2
Part II Aluminum
Time (min)
Temp (°C)
Temp of cold water or base in
styrafoam cups, before
mixing
0
21.5
Temp of hot item or acid,
before mixing
0
95.3
1
Temp calorimeter after
mixing hot item with cold
item (or acid with base)
1
1.5
2
2.5
3
3.5
4
4.5
5
27.3
27.4
27.4
27.4
27.4
27.4
27.4
27.3
27.3
Part III acid-base
Time (min)
Temp (°C)
Temp of cold water or base in
styrafoam cups, before
mixing
0
20.6
Temp of hot item or acid,
before mixing
0
20.9
Temp calorimeter after
mixing hot item with cold
item (or acid with base)
1
1.5
2
2.5
3
3.5
4
4.5
5
27.3
27.3
27.3
27.2
27.1
27.1
27.1
27.0
27.0
2
Experiment #5: Calorimetry & Thermochemical Measurements
Overall Objectives:
Part I: Determine the heat capacity of your calorimeter (Ccal, )
Part II: Determine the specific heat of aluminum and copper (CAl and CCu, )
Part III: Determine the change in enthalpy (ΔHneut, ) for a reaction of sodium hydroxide and hydrochloric acid
Background
Specific Heat of a Substance
= ∆
Heat Capacity of a Calorimeter
= ∆
Part I: Determination of the Heat Capacity of a Calorimeter
Graph
The initial temperature of the hot and cold water is the last temperature
you recorded with your thermometer right before mixing the cold and hot water
The y-intercept is the final temperature for both cold and hot Water
Calculations Part I
3. Energy Lost by hot water is equal to the energy gained by the cold water and calorimeter:

( − , h ) − ( ) 4.184
− , )
( )( − , ) = ( h )(4.184
(
)
(
)


4. Calculate heat capacity of the calorimeter.
Part II: Determination of the Specific Heat of Aluminum and Copper
Calculations Part II
1. Graph to find final temperature
( for the mixture of metal and water, is the y intercept)
The initial temperature is the temperature
you recorded with your thermometer right
before adding the metal to cold water
2.a. q metal = q water+ q cal
You’ll calculate the experimental specific heats of
aluminum and copper
2. b.c. then you’ll calculate the % error by
comparing your specific heats to the theoretical
specific heats of Al and Cu.
Part III: Determination of the Enthalpy Change for a Neutralization
Reaction

Calculations Part II
NaOH (aq) + HCl (aq) → NaCl (aq) + H2O (l)
1. Graph to find final temperature ( for the mixture of the mixture, is the y intercept)
The initial temperature is the average temperature you recorded with your thermometer
right before mixing the 2 solutions.
2. a. Calculate the enthalpy of the reaction (q reaction = q mixture + q cal)
See attached text for assumptions and guide for calculations
b. Determine the limiting reagent
c. Calculate the enthalpy of reaction per mole of the limiting reaction in kJ/mol
3. Calculate the % error by comparing your enthalpy change with the enthalpy change from the pre-lab question 1.
Calculate the % error by comparing your enthalpy change with the enthalpy change from the pre-lab question 2.
Report:
Part I:
a) Include the excel graph used to determine final temperature.
b) Include a table showing the calorimeter constant
Part II:
a) Include the excel graph used to determine final temperature.
b) Include a table showing
The exp specific heats determined for copper and aluminum
The theoretical specific heats of copper and aluminum
The % error for specific heats of copper and aluminum
Part III:
a) Include the excel graph used to determine final temperature.
b) Include a table showing
The experimental △H neutralization
The theoretical △H neutralization
% error
include calculation for p 2b an 2c (kJ/mol)

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