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CHE 3613 Chemical Reaction Engineering Lab_01_Effect of reactant concentration on reaction rate Page 1 of 4
Chemical Reaction Engineering
1.
Introduction/ Objective/
Procedure/Pre lab questions
5%
2.
Calculations /Codes/ Theory.
5%
3.
Data collection/ Findings /
observations
5%
4.
Diagrams / Charts / Figures
and Plots with Captions
10%
5.
Analysis & Discussion /
(theory vs actual)
15%
6.
Conclusions/ Summary /self-
reflection
15%
7.
Quality of work performed
including quality of lab
report, neatness etc.
5%
All students needs to write the lab report based on above Group assessments criteria, as
marks will be given based on above table (60%) so please follow the assessment criteria. All
lab Reports submission are online.
1. Objective (need to write considering plagiarism )
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CHE 3613 Chemical Reaction Engineering Lab_01_Effect of reactant concentration on reaction rate Page 2 of 4
- Observe the relationship between concentration and rate of reaction.
- Determine the rate constant (k) and the reaction order( m.)
2. Theory & Introduction
Student should write in own words Introduction and theory in lab report
3. Apparatus
a) Sodium thiosulfate solution [Na
2
S
2
0
3
] 0.25 mol L
-1
(150 mL)
b) Hydrochloric acid [HCI] 2 mol L
-1
(30 mL)
c) Distilled water
d) Graduated cylinders (10 mL, 25 mL and 100 mL)
e) Conical flasks (two 100 mL)
f) Stop watch
4. Procedure:
Vol. of
0.25 mol/L
Na
2
S
2
O
3
Total
volume
after
mixing
The concentration of
Na
2
S
2
0
3
on mixing
(mol/L)
Time for a cross to
disappear (seconds)
45 ml
50 ml
0.225 mol / L
11.99 s
35 mL
50 ml
(0.25×35)/50
= 0.175
14.97 s
25 mL
50 ml
(0.25×25)/50
= 0.125
21.33 s
15 mL
50 ml
(0.25×15)/50
= 0.075
33.98 s
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CHE 3613 Chemical Reaction Engineering Lab_01_Effect of reactant concentration on reaction rate Page 3 of 4
5 mL
50 ml
(0.25×5)/50
= 0.025
1:50.13 s
a) Placed 45 mL of 0.25 mol/L Na
2
S
2
0
3
in a 100 ml conical flask.
b) Added 5 mL of 2 mol/L HCI and agitated it well to ensure mixing of the reactants. Start a stopped
clock at the moment of addition.
c) Noted and recorded the time taken for the cross to 'disappear' when it is viewed through the solution
from directly overhead. The formation of solid sulfur causes the cross to be obscured.
d) Repeat the experiment using various sodium thiosulfate concentrations, as indicated in the data table.
Figure 1: Flask with reactants over a piece of white paper.
Results and Discussion
Conclusion
Piece of white paper
with cross marked on it
Na
2
S
2
0
3
solution
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CHE 3613 Chemical Reaction Engineering Lab_01_Effect of reactant concentration on reaction rate Page 4 of 4

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Chemical Reaction Engineering Introduction/ Objective/ 1. Procedure/Pre lab questions 2. Calculations /Codes/ Theory. Data collection/ Findings / 3. observations Diagrams / Charts / Figures 4. and Plots with Captions Analysis & Discussion / 5. 5% 5% 10% 15% (theory vs actual) Conclusions/ Summary /self- 6. 5% reflection 15% Quality of work performed 7. including quality of lab 5% report, neatness etc. All students needs to write the lab report based on above Group assessments criteria, as marks will be given based on above table (60%) so please follow the assessment criteria. All lab Reports submission are online. 1. Objective (need to write considering plagiarism ) CHE 3613 Chemical Reaction Engineering Lab_01_Effect of reactant concentration on reaction rate Page 1 of 4 - Observe the relationship between concentration and rate of reaction. Determine the rate constant (k) and the reaction order( m.) 2. Theory & Introduction Student should write in own words Introduction and theory in lab report 3. Apparatus a) b) c) d) e) f) Sodium thiosulfate solution [Na2S203] 0.25 mol L -1 (150 mL) Hydrochloric acid [HCI] 2 mol L -1 (30 mL) Distilled water Graduated cylinders (10 mL, 25 mL and 100 mL) Conical flasks (two 100 mL) Stop watch 4. Procedure: Vol. of 0.25 mol/L Na2S2O3 Vol. of H2O and a 2 mol/L HCl added to dilute the solution Total The concentration of volume Time for a cross to Na2S203 on mixing after disappear (seconds) (mol/L) mixing 45 ml 5 mL HCl 50 ml 10 mL H2O + 5 ml HCl 50 ml 0.225 mol / L 11.99 s (0.25×35)/50 35 mL 14.97 s = 0.175 (0.25×25)/50 25 mL 20 ml H2O + 5 ml HCl 50 ml 21.33 s = 0.125 (0.25×15)/50 30 ml H2O + 5 ml HCl 15 mL CHE 3613 Chemical Reaction Engineering 50 ml 33.98 s = 0.075 Lab_01_Effect of reactant concentration on reaction rate Page 2 of 4 (0.25×5)/50 5 mL 40 ml H2O + 5 ml HCl 50 ml 1:50.13 s = 0.025 a) Placed 45 mL of 0.25 mol/L Na2S203 in a 100 ml conical flask. b) Added 5 mL of 2 mol/L HCI and agitated it well to ensure mixing of the reactants. Start a stopped clock at the moment of addition. c) Noted and recorded the time taken for the cross to 'disappear' when it is viewed through the solution from directly overhead. The formation of solid sulfur causes the cross to be obscured. d) Repeat the experiment using various sodium thiosulfate concentrations, as indicated in the data table. Piece of white paper with cross marked on it Na2S203 solution Figure 1: Flask with reactants over a piece of white paper. Results and Discussion Conclusion CHE 3613 Chemical Reaction Engineering Lab_01_Effect of reactant concentration on reaction rate Page 3 of 4 CHE 3613 Chemical Reaction Engineering Lab_01_Effect of reactant concentration on reaction rate Page 4 of 4 Name: Description: ...
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