Data sheet chem lab - experiment 2: ph and buffers

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Môn: Chemistry Laboratory (CH012IU)

Trường: Trường Đại học Quốc tế, Đại học Quốc gia Thành phố Hồ Chí Minh

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Profile Như Hoa
lOMoARcPSD|364906 32
International University, VNU HCMC GENERAL CHEMISTRY LABORATORY 1
Instructor: MSc. Le Tran Hong Ngoc
DATA SHEET
EXPERIMENT 2: pH AND BUFFERS
Group: __________
Section: 2_pH and Buffers
Date: ___________________
Group members:
___________________________
ID: _____________________
___________________________
ID: _____________________
___________________________
ID: _____________________
___________________________
ID: _____________________
Instructor’s/TA’s signature and comments:
Experiment 1:
Experiment 4:
Experiment 2:
Experiment 5:
Experiment 3:
Approval
Broken glassware (If any):
Equipment Quantity
1. ________________________________________________ _________________
2. ________________________________________________ _________________
3. ________________________________________________ _________________
1. pH of Deionized Water
lOMoARcPSD|364906 32
International University, VNU HCMC GENERAL CHEMISTRY LABORATORY 2
Instructor: MSc. Le Tran Hong Ngoc
Time
(second)
Observed pH
2
nd
(other group in the class)
(Group ___ )
0
20
40
60
80
100
120
140
160
…
2. pH of Strong Acid
Solution
Theoretical
pH
Measure pH
1st
(Your group)
2nd (Group
___ )
10 mL of 0.1M HCl
+ 90 mL of distilled water
+ 90 mL of 0.1M NaOH
+ 90 mL of 0.01M NaOH
lOMoARcPSD|364906 32
International University, VNU HCMC GENERAL CHEMISTRY LABORATORY 3
Instructor: MSc. Le Tran Hong Ngoc
3. pH of Weak Acid
Solution
Average K
a
1st
(Your group)
2nd (Group
___ )
0.1M acetic acid
0.01M acetic acid
0.001M acetic acid
4. pH of Salts
Solution
Predicted
pH
Measure pH
1st
(Your group)
2nd (Group
___ )
0.1M NaCl
0.1M CH
3
COONa
0.1M NH
4
Cl
5. pH of Buffers
Buffer
Volume
(mL)
0.1M
CH
3
COOH
Volume
(mL)
0,1M
CH
3
COONa
[Acid]
[Base]
Calculated
pH
Measured pH
1st
(Your group)
2nd
(Group___)
A
10
40
B
40
10
lOMoARcPSD|364906 32
International University, VNU HCMC GENERAL CHEMISTRY LABORATORY 4
Instructor: MSc. Le Tran Hong Ngoc
¥ Part I: Addition of 10 drops of 0.1M HCl
Buffer
pH from the start
(pH
0
)
pH after adding 10 drops
of 0.1M HCl
Total volume of HCl
(drops) to change by one
unit (pH
0-1
)
A1
B1
¥ Part II: Addition of 10 drops of 0.1M NaOH
Buffer
pH from the start
(pH
0
)
pH after adding 10 drops
of 0.1M NaOH
Total volume of HCl
(drops) to change by one
unit (pH
0+1
)
A2
B2
---
DATA SHEET
EXPERIMENT 3: REDOX TITRATION
Group: __________
Section: 3_Redox Titration
Date: ___________________
Group members:
___________________________
ID: _____________________
___________________________
ID: _____________________
___________________________
ID: _____________________
___________________________
ID: _____________________
Instructor’s/TA’s signature and comments:
lOMoARcPSD|364906 32
International University, VNU HCMC GENERAL CHEMISTRY LABORATORY 5
Instructor: MSc. Le Tran Hong Ngoc
Experiment 1:
Experiment 3:
Experiment 2:
Experiment 4:
Approval:
Broken glassware (If any):
Equipment Quantity
4. ________________________________________________ _________________
5. ________________________________________________ _________________
6. ________________________________________________ _________________
1. Titration of KMnO
4
solution with standard H
2
C
2
O
4
solution
Trial
Burette reading
(mL)
Volume of KMnO
4
(mL)
Normality of KMnO
4
(N)
#1
_______ - _______
#2
_______ - _______
Average Normality of KMnO
4
= _________________________ (N)
2. Titration of unknown concentration H
2
C
2
O
4
solution with standard KMnO
4
solution
Trial
Burette reading
(mL)
Volume of KMnO
4
(mL)
Normality of H
2
C
2
O
4
(N)
#1
_______ - _______
#2
_______ - _______
Average Normality of H
2
C
2
O
4
= _________________________ (N)
lOMoARcPSD|364906 32
International University, VNU HCMC GENERAL CHEMISTRY LABORATORY 6
Instructor: MSc. Le Tran Hong Ngoc
3. Titration of unknown concentration of FeSO
4
solution with standard KMnO
4
solution
Trial
Burette reading
(mL)
Volume of KMnO
4
(mL)
Normality of FeSO
4
(N)
#1
_______ - _______
#2
_______ - _______
Average Normality of FeSO
4
= _________________________ (N)
---
DATA SHEET
EXPERIMENT 4: CHEMICAL EQUILIBRIUM
Group: __________
Section: 4_Chemical Equilibrium
Date: ___________________
Group members:
___________________________
ID: _____________________
___________________________
ID: _____________________
___________________________
ID: _____________________
___________________________
ID: _____________________
Instructor’s/TA’s signature and comments:
Experiment 1:
Experiment 4:
Experiment 2:
Experiment 5:
lOMoARcPSD|364906 32
International University, VNU HCMC GENERAL CHEMISTRY LABORATORY 7
Instructor: MSc. Le Tran Hong Ngoc
Experiment 3:
Approval
Broken glassware (If any):
Equipment Quantity
1. ________________________________________________ _________________
2. ________________________________________________ _________________
3. ________________________________________________ _________________
1. Acid/Base Equilibria
Equilibrium System: 2CrO
4
2-
(aq)
+ 2H
+
(aq)
⇌ Cr
2
O
7
2-
(aq)
+
H
2
O
(l)
Description of
conditions
Predicted outcome
Observation
Initial solution
+ Conc. HCl
+ 6N NaOH
2. Equilibria of Acid/Base Indicators
Equilibrium System: H(MV)
(aq)
+ H
2
O
(l)
⇌ H
3
O
+
(aq)
+ MV
-
(aq)
Description of
conditions
Predicted outcome
Observation
None (Control)
+ 6M HCl
lOMoARcPSD|364906 32
International University, VNU HCMC GENERAL CHEMISTRY LABORATORY 8
Instructor: MSc. Le Tran Hong Ngoc
+ 6M NaOH
+ 6M HCl
---
3. Equilibria of Precipitation Reactions
Equilibrium System: Ca
2+
(aq)
+ C
2
O
4
2-
(aq)
⇌ CaC
2
O
4(s)
Description of
conditions
Predicted outcome
Observation
Test tube #1
+ 0.1M Na
2
C
2
O
4
Test tube #2
+ 0.1M H
2
C
2
O
4
+ 6M HCl
+ 6M NH
4
OH
4. Temperature Effects on Equilibria
Equilibrium System: [Co(H
2
O)
6
]
2+
(aq)
+ 4Cl
-
(aq)
⇌ (CoCl
4
)
2-
(aq)
+
6H
2
O
(l)
Description of
conditions
Predicted outcome
Observation
Test tube #1
lOMoARcPSD|364906 32
International University, VNU HCMC GENERAL CHEMISTRY LABORATORY 9
Instructor: MSc. Le Tran Hong Ngoc
Room
temperature
Test tube #2
Hot water bath ¯
Ice water bath
Test tube #3
Ice water bath ¯
Hot water bath
---
DATA SHEET
EXPERIMENT 5: FACTORS AFFECTING REACTION RATE
Group: __________
Section: 5_Reaction Rate
Date: ___________________
Group members:
___________________________
ID: _____________________
___________________________
ID: _____________________
___________________________
ID: _____________________
___________________________
ID: _____________________
Instructor’s/TA’s signature and comments:
lOMoARcPSD|364906 32
International University, VNU HCMC GENERAL CHEMISTRY LABORATORY 10
Instructor: MSc. Le Tran Hong Ngoc
Experiment 1:
Experiment 3:
Experiment 2:
Approval
Broken glassware (If any):
Equipment Quantity
1. ________________________________________________ _________________
2. ________________________________________________ _________________
3. ________________________________________________ _________________
1. Effect of Concentration on The Reaction Time
Reaction #1: _______________________________________________________________
Reaction #2: _______________________________________________________________
Calculate the initial concentration of I
-
and S
2
O
8
2-
ions:
Mixture #5:
[I
-
] =
[S2O82-]=
Mixture
Iodide ion
(mol/L)
Peroxydisulfate
(mol/L)
Time in seconds
1
2
3
4
5
lOMoARcPSD|364906 32
International University, VNU HCMC GENERAL CHEMISTRY LABORATORY 11
Instructor: MSc. Le Tran Hong Ngoc
6
7
8
9
10
11
2. Effect of Temperature on The Reaction Rate Equilibrium System:
5H2C2O4(aq) + 2KMnO4(aq) + 3H2SO4 (aq) ® 2MnSO4(aq) + K2SO4(aq) + 10CO2(g) + 8H2O(l)
Description of
conditions
Predicted outcome
Observation
Reaction time
(second)
Test tube #1A - B
Room
temperature
Test tube #2A - B
50
o
C
Test tube #3A - B
90
o
C
3. Effect of a Catalyst on The Reaction Rate
Equilibrium System: 2H
2
O
2
(aq) ® 2H
2
O
(l)
+ O
2
(g)
Trial
Description of
conditions
Predicted outcome
Observation
(Reaction rate)
lOMoARcPSD|364906 32
International University, VNU HCMC GENERAL CHEMISTRY LABORATORY 12
Instructor: MSc. Le Tran Hong Ngoc
1
+ MnCl
2
2
+ MnO
2
3
+ NaCl
4
+ CaCl
2
5
+ Zn
6
+ KNO
3
7
+ Fe(NO
3
)
3
---
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lOMoARcPSD|364 906 32
International University, VNU HCMC GENERAL CHEMISTRY LABORATORY 1
Instructor: MSc. Le Tran Hong Ngoc DATA SHEET
EXPERIMENT 2: pH AND BUFFERS
Group: __________ Section: 2_pH and Buffers
Date: ___________________ Group members:
___________________________ ID: _____________________
___________________________ ID: _____________________
___________________________ ID: _____________________
___________________________ ID: _____________________
Instructor’s/TA’s signature and comments: Experiment 1: Experiment 4: Experiment 2: Experiment 5: Experiment 3: Approval
Broken glassware (If any): Equipment Quantity
1. ________________________________________________ _________________
2. ________________________________________________ _________________
3. ________________________________________________ _________________
1. pH of Deionized Water lOMoARcPSD|364 906 32
International University, VNU HCMC GENERAL CHEMISTRY LABORATORY 2
Instructor: MSc. Le Tran Hong Ngoc Observed pH Time 1st
2nd (other group in the class) (second) (Your group) (Group ___ ) 0 20 40 60 80 100 120 140 160 … 2. pH of Strong Acid Measure pH Theoretical Solution 1st 2nd (Group pH (Your group) ___ ) 10 mL of 0.1M HCl + 90 mL of distilled water + 90 mL of 0.1M NaOH + 90 mL of 0.01M NaOH lOMoARcPSD|364 906 32
International University, VNU HCMC GENERAL CHEMISTRY LABORATORY 3
Instructor: MSc. Le Tran Hong Ngoc 3. pH of Weak Acid Measure pH Solution 1st 2nd (Group Average Ka (Your group) ___ ) 0.1M acetic acid 0.01M acetic acid 0.001M acetic acid 4. pH of Salts Measure pH Predicted Solution 1st 2nd (Group pH (Your group) ___ ) 0.1M NaCl 0.1M CH3COONa 0.1M NH4Cl 5. pH of Buffers Volume Volume Measured pH (mL) (mL) Calculated Buffer [Acid] [Base] 1st 2nd 0.1M 0,1M pH
(Your group) (Group___) CH3COOH CH3COONa A 10 40 B 40 10 lOMoARcPSD|364 906 32
International University, VNU HCMC GENERAL CHEMISTRY LABORATORY 4
Instructor: MSc. Le Tran Hong Ngoc
¥ Part I: Addition of 10 drops of 0.1M HCl Total volume of HCl pH from the start
pH after adding 10 drops Buffer
(drops) to change by one (pH0) of 0.1M HCl unit (pH0-1) A1 B1
¥ Part II: Addition of 10 drops of 0.1M NaOH Total volume of HCl pH from the start
pH after adding 10 drops Buffer
(drops) to change by one (pH0) of 0.1M NaOH unit (pH0+1) A2 B2 --- DATA SHEET
EXPERIMENT 3: REDOX TITRATION
Group: __________ Section: 3_Redox Titration
Date: ___________________ Group members:
___________________________ ID: _____________________
___________________________ ID: _____________________
___________________________ ID: _____________________
___________________________ ID: _____________________
Instructor’s/TA’s signature and comments: lOMoARcPSD|364 906 32
International University, VNU HCMC GENERAL CHEMISTRY LABORATORY 5
Instructor: MSc. Le Tran Hong Ngoc Experiment 1: Experiment 3: Experiment 2: Experiment 4: Approval:
Broken glassware (If any): Equipment Quantity
4. ________________________________________________ _________________
5. ________________________________________________ _________________
6. ________________________________________________ _________________
1. Titration of KMnO4 solution with standard H2C2O4 solution Burette reading Volume of KMnO4 Normality of KMnO4 Trial (mL) (mL) (N) #1 _______ - _______ #2 _______ - _______
Average Normality of KMnO4 = _________________________ (N)
2. Titration of unknown concentration H2C2O4 solution with standard KMnO4 solution Burette reading Volume of KMnO Normality of H Trial 4 2C2O4 (mL) (mL) (N) #1 _______ - _______ #2 _______ - _______
Average Normality of H2C2O4 = _________________________ (N) lOMoARcPSD|364 906 32
International University, VNU HCMC GENERAL CHEMISTRY LABORATORY 6
Instructor: MSc. Le Tran Hong Ngoc
3. Titration of unknown concentration of FeSO4 solution with standard KMnO4 solution Burette reading Volume of KMnO4 Normality of FeSO4 Trial (mL) (mL) (N) #1 _______ - _______ #2 _______ - _______
Average Normality of FeSO4 = _________________________ (N) --- DATA SHEET
EXPERIMENT 4: CHEMICAL EQUILIBRIUM
Group: __________ Section: 4_Chemical Equilibrium Date: ___________________ Group members:
___________________________ ID: _____________________
___________________________ ID: _____________________
___________________________ ID: _____________________
___________________________ ID: _____________________
Instructor’s/TA’s signature and comments: Experiment 1: Experiment 4: Experiment 2: Experiment 5: lOMoARcPSD|364 906 32
International University, VNU HCMC GENERAL CHEMISTRY LABORATORY 7
Instructor: MSc. Le Tran Hong Ngoc Experiment 3: Approval
Broken glassware (If any): Equipment Quantity
1. ________________________________________________ _________________
2. ________________________________________________ _________________
3. ________________________________________________ _________________
1. Acid/Base Equilibria
Equilibrium System: 2CrO 2- 4 (aq) + 2H+(aq) ⇌ Cr2O72-(aq) + H2O(l) Description of Predicted outcome Observation conditions Initial solution + Conc. HCl + 6N NaOH
2. Equilibria of Acid/Base Indicators
Equilibrium System: H(MV)(aq) + H2O(l) ⇌ H3O+(aq) + MV-(aq) Description of Predicted outcome Observation conditions None (Control) + 6M HCl lOMoARcPSD|364 906 32
International University, VNU HCMC GENERAL CHEMISTRY LABORATORY 8
Instructor: MSc. Le Tran Hong Ngoc + 6M NaOH + 6M HCl ---
3. Equilibria of Precipitation Reactions
Equilibrium System: Ca2+ 2- (aq) + C2O4 (aq) ⇌ CaC2O4(s) Description of Predicted outcome Observation conditions Test tube #1 + 0.1M Na2C2O4 Test tube #2 + 0.1M H2C2O4 + 6M HCl + 6M NH4OH
4. Temperature Effects on Equilibria
Equilibrium System: [Co(H2O)6]2+(aq) + 4Cl-(aq) ⇌ (CoCl4)2-(aq) + 6H2O(l) Description of Predicted outcome Observation conditions Test tube #1 lOMoARcPSD|364 906 32
International University, VNU HCMC GENERAL CHEMISTRY LABORATORY 9
Instructor: MSc. Le Tran Hong Ngoc Room temperature Test tube #2 Hot water bath ¯ Ice water bath Test tube #3 Ice water bath ¯ Hot water bath --- DATA SHEET
EXPERIMENT 5: FACTORS AFFECTING REACTION RATE
Group: __________ Section: 5_Reaction Rate
Date: ___________________ Group members:
___________________________ ID: _____________________
___________________________ ID: _____________________
___________________________ ID: _____________________
___________________________ ID: _____________________
Instructor’s/TA’s signature and comments: lOMoARcPSD|364 906 32
International University, VNU HCMC GENERAL CHEMISTRY LABORATORY 10
Instructor: MSc. Le Tran Hong Ngoc Experiment 1: Experiment 3: Experiment 2: Approval
Broken glassware (If any): Equipment Quantity
1. ________________________________________________ _________________
2. ________________________________________________ _________________
3. ________________________________________________ _________________ 1.
Effect of Concentration on The Reaction Time
Reaction #1: _______________________________________________________________
Reaction #2: _______________________________________________________________
Calculate the initial concentration of I- and S 2- 2O8 ions: Mixture #5: [I-] = [S2O82-]= Iodide ion Peroxydisulfate Mixture Time in seconds (mol/L) (mol/L) 1 2 3 4 5 lOMoARcPSD|364 906 32
International University, VNU HCMC GENERAL CHEMISTRY LABORATORY 11
Instructor: MSc. Le Tran Hong Ngoc 6 7 8 9 10 11 2.
Effect of Temperature on The Reaction Rate Equilibrium System: 5H ®
2C2O4(aq) + 2KMnO4(aq) + 3H2SO4 (aq)
2MnSO4(aq) + K2SO4(aq) + 10CO2(g) + 8H2O(l) Description of Reaction time Predicted outcome Observation conditions (second) Test tube #1A - B Room temperature Test tube #2A - B 50oC Test tube #3A - B 90oC 3.
Effect of a Catalyst on The Reaction Rate
Equilibrium System: 2H2O2(aq) ® 2H2O(l) + O2(g) Description of Observation Trial Predicted outcome conditions (Reaction rate) lOMoARcPSD|364 906 32
International University, VNU HCMC GENERAL CHEMISTRY LABORATORY 12
Instructor: MSc. Le Tran Hong Ngoc 1 + MnCl2 2 + MnO2 3 + NaCl 4 + CaCl2 5 + Zn 6 + KNO3 7 + Fe(NO3)3 ---
Document Outline

  • DATA SHEET
    • EXPERIMENT 2: pH AND BUFFERS
  • DATA SHEET (1)
    • EXPERIMENT 3: REDOX TITRATION
  • DATA SHEET (2)
    • EXPERIMENT 4: CHEMICAL EQUILIBRIUM
  • DATA SHEET (3)
    • EXPERIMENT 5: FACTORS AFFECTING REACTION RATE