Aspirin Lab Report

Standardization of NaOH Part APreparation of KHP
Trial 1
KHP
Trial 2
Trial 3
Trial 4
Empty Container Mass
(Grams)
Container with KHP (Grams)
Mass of KHP (grams)
Moles KHP
Standardization of NaOH
NaOH
Initial Buret
Reading (mL)
Final Buret Reading
(mL)
Total Volume of
NaOH delivered
(mL)
Moles of NaOH
Molarity of NaOH
Mean Molarity
Value of Best 3
Trials
% Error od Best 3
trials
Trial 1
Trial 2
Trial 3
Trial 4
Titration of an Unknown Acid Part B
Acid Trial 1
Acid Trial 2
Acid Trial 3
Acid Trial 4
10
10
10
10
Initial Buret Reading
of NaOH (mL)
Final Buret Reading
of NaOH (mL)
Total Volume of NaOH
used in Titration (mL)
Enter Mean Molarity from the
Standardization of NaOH from Part A
Moles of NaOH
Volume of Unknown Acid Titrated
(mL)
Moles of HCl
Molarity of HCl
Average HCl Molarity for selected
Trials
Percent Error for each titration
selected
Determination of the Concentration of the NaOH Solution:
Part A
1. Balanced Equation for the reaction of KHP and NaOH:
NaOH (aq) + KHC8H4O4 (aq) →
Acid
Base
HOH (l) + KNaC8H4O4 (aq)
Water
Salt
2. The Grams of KHP
 On the data table provided, we have provided the mass of the
An empty container and same container w/ KHP.
 Use mass by difference to calculate the grams of KHP
3. Convert Grams to Moles
 Use the following molar mass for KHP in this exercise
 Molar mass of KHP 204.2g = 1 mole KHP
𝑀𝑜𝑙𝑒𝑠 𝐾𝐻𝑃 = 𝐺𝑟𝑎𝑚𝑠 𝐾𝐻𝑃 𝑥
1 𝑀𝑜𝑙𝑒 𝐾𝐻𝑃
204.2 𝐺 𝐾𝐻𝑃
 3 significant figures are required: 0.00356 (Yes)
0.003(No)
4. Moles of NaOH
You have completed the Titration and you stopped at the pale pink endpoint.
o What does this mean? The reaction is over. All the acid has been reacted.
Question: How many moles of NaOH where used in the reaction?
Moles of KHP = Moles of NaOH
Why?
# 𝑀𝑜𝑙𝑒𝑠 𝑜𝑓 𝐾𝐻𝑃 𝑥
1 𝑚𝑜𝑙𝑒𝑠 𝑜𝑓 𝑁𝑎𝑂𝐻
= # 𝑀𝑜𝑙𝑒𝑠 𝑜𝑓 𝑁𝑎𝑂𝐻
1 𝑀𝑜𝑙𝑒 𝑜𝑓 𝐾𝐻𝑃
Therefore, if you calculated that you had 0.00325 moles of KHP then
you would have the same numbers of Moles of NaOH: 0.00325 .
5. Calculate the Volume of NaOH Delivered
a. We have provided you with the initial and final buret reading for each
trial. Use the Volume by difference calculation to determine the
volume delivered:
Final Buret Reading – Initial Burt Reading = Volume Delivered (mL)
6. To Calculate Concentration of NaOH (Molarity)
# 𝑚𝑜𝑙𝑒𝑠 𝑁𝑎𝑂𝐻
1000 𝑚𝐿 𝑀𝑜𝑙𝑒𝑠
𝑥
=
𝑫𝒆𝒍𝒊𝒗𝒆𝒓 𝑽𝒐𝒍𝒖𝒎𝒆 𝒐𝒇 𝑵𝒂𝑶𝑯 (𝒎𝑳)
1 𝐿𝑖𝑡𝑒𝑟
𝐿𝑖𝑡𝑒𝑟
7. Calculate the Mean Value for your best three trials
8. Calculate the percent error for your best three trials
𝑇𝑟𝑖𝑎𝑙 𝑀𝑜𝑙𝑎𝑖𝑟𝑦
𝑀𝑒𝑎𝑛 𝑀𝑜𝑙𝑎𝑙𝑟𝑖𝑡𝑦
Proceed to Part B
𝑥 100
Determination of Unknown Acid Concentration:
Part B
1. Balanced Equation for the reaction of HCL and NaOH:
HCl(aq) + NaOH(aq) → H2O(l) + NaCl(aq)
Acid
Base
Water
Salt
2. The moles of NaOH is calculated as follows
𝑀𝑜𝑙𝑒𝑠 𝑁𝑎𝑂𝐻 = 𝑀𝑜𝑙𝑎𝑟𝑖𝑡𝑦 𝑜𝑓 𝑁𝑎𝑂𝐻 𝑋 𝑉𝑜𝑙𝑢𝑚𝑒 𝑁𝑎𝑂𝐻 𝐿𝑖𝑡𝑒𝑟𝑠
i.
The 𝑀𝑜𝑙𝑎𝑟𝑖𝑡𝑦 𝑜𝑓 𝑁𝑎𝑂𝐻 comes from the mean Molarity value
determined in the standardization of NaOH Part A.
ii.
To calculate the volume of NaOH Deliver use the technique:
Volume by difference:
Final Buret Reading – Initial Burt Reading Volume Delivered
iii.
At the pale pink end point the reaction is complete
𝑀𝑜𝑙𝑒𝑠 𝑜𝑓 𝑁𝑎𝑂𝐻 𝑥
1 𝑚𝑜𝑙𝑒𝑠 𝐻𝐶𝐿
= 𝑀𝑜𝑙𝑒𝑠 𝑜𝑓 𝐻𝐶𝑙
1 𝑀𝑜𝑙𝑒 𝑜𝑓 𝑁𝑎𝑂𝐻
Moles of HCl = Moles of NaOH
iv.
Calculate Concentration of HCL (Molarity = Moles/Liter)
? 𝑚𝑜𝑙𝑒𝑠 𝐻𝐶𝐿
1000 𝑚𝐿 𝑀𝑜𝑙𝑒𝑠
𝑥
=
𝑉𝑜𝑙𝑢𝑚𝑒 𝑜𝑓 𝐴𝑐𝑖𝑑
1 𝐿𝑖𝑡𝑒𝑟
𝐿𝑖𝑡𝑒𝑟
The volume of the acid was 10.00 mL
? 𝑚𝑜𝑙𝑒𝑠 𝐻𝐶𝐿 1000 𝑚𝐿 𝑀𝑜𝑙𝑒𝑠
𝑥
=
10.00
1 𝐿𝑖𝑡𝑒𝑟
𝐿𝑖𝑡𝑒𝑟
Last Name
Ajayi
Alsabilah
Banks
Beavers
Brewer
Brock
Brown
Carter
Chac
Collins
Conner
Cooper
Deptola
Dickey
Dixon
El-Shami
Givens
Green
Harris
Hawkins
Hill
Hoy
Island
McBroome
McGinnis
Montgomery
Mosby
Nelson
Nguyen
Nguyen
Orey
Pink
Preston
Pullum
Richardson
Richmond
Rodriguez
Savage
Snider
Spina
Towner
Tran
White
Tuesday @ 11
First Name
Mass (g)
Olushola
Saud
Madelynn
Sydney
Sydney
Nicholas
Benjamin
Ashley
Bryan
Camron
Leslie
Emily
Emma
Berry
Nyha
Nadia
Johnaya
Claira
Jaden
Zion
Christopher
Tamila
Faith
Abigail
Brooke
Nashawnta
Rylee
Albert
Daniel
Hieu
Jesse
Alex
Cody
Makayla
Canaan
Garrett
Aaliyah
Payton
Dawson
Julianna
Hayden
Ngoc Hoai Thuong
Caitlyn
3,828
3,910
4,318
4,603
4,103
4,103
4,447
3,604
4,302
4,234
4,066
3,604
4,073
4,494
1,589
1,589
4,494
4,318
4,603
4,234
3,910
4,447
5,088
4,256
4,103
4,103
4,073
4,311
5,233
4,103
3,527
4,302
4,311
5,088
4,066
Last Name
Adell
Austin
Barrow
Bolden
Boyd
Brown
Burcham
Buys
Cho
Conaway
Davis
Davis
Dobson
Dubar
Escue
Farag
Foucault
Gramling
Greenwood
Head
Hoang
Holcomb
Karther
Khan
Killgore
Killips
Lee
Lee
Little
Mccorkle
Munoz
Nguyen
Owen
Ragsdale
Robbins
Sheffield
Simmons
Smith
Smith
Smith
Taber
Tagupa
Washington
Watson
Woods
Tuesday @ 2
First Name
Denarius
Chance
Peyton
Brekireya
Dakota
Averi
Shawna
Haley
Junhui
Chloe
Jackson
Madison
Kyra
Jared
Tristin
Fared
Demi
Tiffany
Logan
Katie
Anh
Ethan
Trevor
Qasim Hassan
Matthew
Emilie
Byunghyu
Sydney
Jered
Spencer
Jose
Bao
Sarah
Emma
Carson
Daniel
Carson
Hannah
Preston
Robert
Murphy
Bailey
Amari
Eric
Bryson
Mass (g)
3,560
4,167
5,545
5,605
3,558
2,529
4,839
5,605
2,537
3,727
3,818
6,405
3,688
3,688
4,177
5,190
3,727
4,160
3,790
4,011
3,818
4,177
3,257
4,536
5,545
4,011
3,790
3,207
4,536
4,167
3,257
3,558
4,160
4,346
3,207
3,189
3,560
3,485
Wednesday @
Last Name
Adams
Al Saeed
Alkhabbaz
Andrews
Beckner
Bell
Benbrook
Bollinger
Boushka
Brock
Bruce
Burke
Carpenter
Chandler
Childers
Counts
De La Rosa
Dry
Elliott
Farrington
Felts
George
Gilbert
Harris
Heang
Helton
Hill
Horton
Johnson
Jones
Jonker
Karlsson
Long
Miller
Neves
Pate
Raup
Rideout
Rougeau_PreviewUser
Rutledge
Silos
Taylor
Watkins
Wood
Handre?
Yancey
Haden
5,190 Abhishek?
Wednesday @11
First Name
Mass (g)
Easton
4,029
Fatimah
3,913
Mishaal
6,634
Jonathan
4,142
Jenna
3,403
Jacob
3,222
Caleb
4,305
Maria
2,828
Mariah
2,828
Destinee
Brad
4,849
Teagan
Hailey
5,496
Rebecca
Kaitlyn
2,828
Amelia
3,566
Brianna
3,967
Sydney
2,907
Marilee
3,566
Malcolm
3,696
Avery
4,599
Sierra
4,117
Jasmine
3,275
Evangelynn
Christina
3,967
Breeanna
4,849
Eli
Makenzie
2,907
Keith
Mathew
4,045
Gert Johanne
Jon
Kaleb
4,599
Alexis
4,045
Colby
4,029
Raeleigh
4,305
Madeline
4,117
Kenya
Benjamin
Sara
Isaac
3,696
Tanisha
5,496
Keelan
Dylan
Handre?
3,939
Last Name
Al Nakhalah
Allen
Bates
Baxter
Butler
Cline
Coleman
Cromer
Crowl
Davis
Dawson
Fitzgerald
Fowler
Gillham
Golden
Harris
Holloway
Houston
Inman
James
Jones
Leflore
McClain
McIlvoy
McLaurin
Meyer
Miller
Miller
Needham
Penland
Quick
Quinn
Redden
Reed
Rudder
Schreyer
Seats
Sebesta
Slaughter
Smith
Stover
Swink
Treasitti
Turner
Volner
Wednesday @2
First Name
Shorog
Devon
Brandon
Haleigh
Alivia
Abigail
Erin
James
Hannah
Johnna
Aiyana
Glenn
Emma
Sydney
Melissa
Dakota
Ian
Cali
Alexandria
Jessica
Lydia
Arnesha
Caitlin
Anna
Katherine
Camryn
Gracie
Noel
Hailey
Peyton
Allison
Anna
Joshua
Kenneth
Justin
Caleb
Hannah
Austin
Solomon
Chance
Trenton
Caleb
Kayla
Larry
Madeleine
Mass (g)
3,123
6,835
4,613
4,750
5,530
4,968
6,412
4,845
4,201
4,551
4,201
6,605
4,842
6,412
4,113
4,197
4,613
3,459
4,842
4,551
5,681
6,605
7,160
5,751
4,113
4,582
4,408
3,123
3,459
5,979
5,751
4,582
3,961
4,845
4,197
3,890
7,160
5,681
3,961
6,835
5,979
4,968
3,890
4,408
Kumbhari?
4,142 Ward
Watkins
Westman-Forbes
Wright
Delphia
Sydney
Mikayla
Anna
4,750
4,272
4,272
5,530
Name:
Last, First
General Chemistry 1: Week 9 – Aspirin Lab
Week 1 Data
Mass of Flask
Mass of both
Mass of Salicylic Acid (g)
Volume of Acetic Anhydride (mL)
Mass of Acetic Anhydride (g)
Moles of Salicylic Acid
Moles of Acetic Anhydride
Limiting Reagent
Theoretical Moles Aspirin
Mass of Filter paper 1 (g)
Mass of Filter paper 2 (g)
Mass of Envelope (g)
Combined Mass (g)
Enter Data
stry 1: Week 9 – Aspirin Lab
Week 2 Data
Total Mass (g)
Actual Mass of Aspirin (g)
Theoretical Mass of Aspirin (g)
Percent Yield
Enter Data
Enter two letter abrv for limiting reagent
Do NOT enter units into the cells
Enter values exactly as you have them written
on your paper