Difference between revisions of "ChemCollective-Virtual-Labs/C3/Heat-of-Reaction/English"
Line 15: | Line 15: | ||
| In this tutorial, we will learn to, | | In this tutorial, we will learn to, | ||
− | Determine heat change for the neutralisation of Sodium hydroxide (NaOH) and Hydrochloric acid(HCl).Calculate heat of reaction for three different reactions. | + | Determine heat change for the neutralisation of Sodium hydroxide (NaOH) and Hydrochloric acid(HCl). |
+ | |||
+ | Calculate heat of reaction for three different reactions. | ||
|- | |- | ||
Line 23: | Line 25: | ||
− | '''Rx1: NaOH(s) +H<sub>2</sub>O(l) -> Na<sup>+</sup>(aq) + OH<sup>-</sup>(aq)''' | + | '''Rx1: NaOH(s) +H<sub>2</sub>O(l) ->''' |
+ | |||
+ | '''Na<sup>+</sup>(aq) + OH<sup>-</sup>(aq)''' | ||
+ | |||
+ | |||
+ | '''Rx2: NaOH (s) + HCl (aq) -> ''' | ||
+ | '''Na<sup>+</sup>(aq) + Cl<sup>-</sup>(aq)+H<sub>2</sub>O ''' | ||
− | |||
+ | '''Rx3: NaOH (aq) + HCl (aq) ->''' | ||
− | ''' | + | '''Na<sup>+</sup>(aq) + Cl<sup>-</sup>(aq) +H<sub>2</sub>O(l)''' |
| The three reactions are shown here. | | The three reactions are shown here. | ||
Line 57: | Line 65: | ||
ChemCollective Vlabs version 2.1.0 | ChemCollective Vlabs version 2.1.0 | ||
− | Java version 8 | + | Java version 8. |
|- | |- | ||
Line 66: | Line 74: | ||
|- | |- | ||
− | | | + | |Click on '''File->Load homework'''. |
Line 77: | Line 85: | ||
'''Default Lab setup ''' dialog box opens. | '''Default Lab setup ''' dialog box opens. | ||
− | In the box select '''Thermochemistry'''. | + | In the box, select '''Thermochemistry'''. |
− | Double click on '''Heats of the reaction- | + | Double click on '''Heats of the reaction- Hess’s Law''' option. |
|- | |- | ||
− | | Click on '''Stockroom Explorer''' and select ''' | + | | Click on '''Stockroom Explorer''' and select '''Problem Description''' option. |
| Click on '''Problem Description''' in '''Stockroom Explorer'''. | | Click on '''Problem Description''' in '''Stockroom Explorer'''. | ||
Line 138: | Line 146: | ||
− | '''Rx1: NaOH(s) +H<sub>2</sub>O(l) -> | + | '''Rx1: NaOH(s) +H<sub>2</sub>O(l) ->''' |
+ | '''Na<sup>+</sup>(aq) + OH<sup>-</sup>(aq)''' | ||
− | |||
− | ''' | + | '''Rx3: NaOH(aq) + HCl(aq) ->''' |
+ | ''' Na<sup>+</sup>(aq) + Cl<sup>-</sup>(aq) +H<sub>2</sub>O(l)''' | ||
− | '''Rx2: NaOH (s) + HCl (aq) -> Na<sup>+</sup>(aq) + Cl<sup>-</sup>(aq)+H<sub>2</sub>O ''' | + | ------------------------------------------------------------------- |
+ | |||
+ | |||
+ | '''Rx2: NaOH (s) + HCl (aq) ->''' | ||
+ | |||
+ | '''Na<sup>+</sup>(aq) + Cl<sup>-</sup>(aq)+H<sub>2</sub>O ''' | ||
| Sum of Heats of reactions for, | | Sum of Heats of reactions for, | ||
Line 156: | Line 170: | ||
|- | |- | ||
| Go back to '''Workbench''' | | Go back to '''Workbench''' | ||
− | | Let us go back to '''Workbench | + | | Let us go back to '''Workbench'''. |
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|- | |- | ||
− | | | + | |From the '''Stockroom Explorer''', |
Double-click on '''Distilled water''' . | Double-click on '''Distilled water''' . | ||
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|- | |- | ||
|Click on '''select tools''' icon, double-click on '''Scale'''. | |Click on '''select tools''' icon, double-click on '''Scale'''. | ||
− | | From the instrument menu, select | + | | From the instrument menu, select '''Weighing Boat ''' and a ''' Scale'''. |
|- | |- | ||
Line 207: | Line 221: | ||
| Weigh 1 gram of''' Sodium hydroxide''' using '''Weighing Boat'''. | | Weigh 1 gram of''' Sodium hydroxide''' using '''Weighing Boat'''. | ||
− | Place the '''Weighing Boat''' on the '''Scale''', click on '''TARE | + | Place the '''Weighing Boat''' on the '''Scale''', click on '''TARE'''. |
|- | |- | ||
− | | | + | |Drag '''Sodium hydroxide''' bottle over to '''Weighing Boat'''. |
Type 1 in the '''Transfer amount''' input bar. | Type 1 in the '''Transfer amount''' input bar. | ||
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− | Click on ''' | + | Click on '''Pour'''. |
|- | |- | ||
Line 272: | Line 286: | ||
Record the highest temperature on the '''thermometer'''. | Record the highest temperature on the '''thermometer'''. | ||
− | '''Thermometer''' shows 30.29 degrees '''Celsius | + | '''Thermometer''' shows 30.29 degrees '''Celsius'''. |
|- | |- | ||
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'''q = m * s * ∆T''' | '''q = m * s * ∆T''' | ||
− | wherein 'm' is | + | wherein 'm' is mass of the reactants, |
's' is the specific heat of the product and | 's' is the specific heat of the product and | ||
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| Lets go back to '''workbench'''. | | Lets go back to '''workbench'''. | ||
− | let us delete the used ''' | + | let us delete the used '''Graduated Cylinder''' and '''Foam Cup'''. |
|- | |- | ||
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|- | |- | ||
− | | From the | + | | From the '''Chemical Stockroom''', |
Double-click on 0.5 M '''Hydrochloric acid''' from the '''Strong-acids cabinet'''. | Double-click on 0.5 M '''Hydrochloric acid''' from the '''Strong-acids cabinet'''. | ||
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|- | |- | ||
− | | | + | | Drag the '''0.5M Hydrochloric acid''' bottle over the '''Graduated Cylinder'''. |
Type 50 in the '''Transfer bar'''. | Type 50 in the '''Transfer bar'''. | ||
Click on '''Pour'''. | Click on '''Pour'''. | ||
− | | Transfer 50 mL of '''Hydrochloric acid''' into the '''Graduated Cylinder | + | | Transfer 50 mL of '''Hydrochloric acid''' into the '''Graduated Cylinder'''. |
|- | |- | ||
− | | | + | |Drag '''Weighing boat''' and place it on the '''Scale'''. |
Click on '''TARE'''. | Click on '''TARE'''. | ||
Line 456: | Line 470: | ||
|- | |- | ||
|Select '''Foam Cup''' and '''Graduated Cylinder''', '''scale''' and '''0.5M HCl''' and press delete | |Select '''Foam Cup''' and '''Graduated Cylinder''', '''scale''' and '''0.5M HCl''' and press delete | ||
− | |Delete the used apparatus and chemicals from the | + | |Delete the used apparatus and chemicals from the '''Workbench'''. |
|- | |- | ||
|Double-click on '''Glassware''' icon. | |Double-click on '''Glassware''' icon. | ||
− | Double-click on 25 mL '''Graduated Cylinder''' and '''Foam Cup'''. | + | Double-click on 25 mL '''Graduated Cylinder''' and a '''Foam Cup'''. |
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T2 = 31.67 <sup>o</sup> C | T2 = 31.67 <sup>o</sup> C | ||
− | | Click on Foam Cup. | + | | Click on '''Foam Cup'''. |
Allow the reaction to take place for a few seconds. | Allow the reaction to take place for a few seconds. | ||
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− | Thermometer shows 31.67 <sup>o</sup> C. | + | '''Thermometer''' shows 31.67 <sup>o</sup> C. |
|- | |- | ||
Line 613: | Line 627: | ||
ΔH2 = -102.47 KJ mol<sup>-1</sup> | ΔH2 = -102.47 KJ mol<sup>-1</sup> | ||
− | | Let us now | + | | Let us now analyze the results. |
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− | Determined heat change for neutralization of '''Sodium hydroxide''' and '''Hydrochloric acid'''. | + | Determined heat change for neutralization of '''Sodium hydroxide''' |
+ | |||
+ | and '''Hydrochloric acid'''. | ||
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'''About Spoken Tutorial project''' | '''About Spoken Tutorial project''' | ||
− | | The video at the following link summarizes the '''Spoken Tutorial ''' | + | | The video at the following link summarizes the '''Spoken Tutorial project'''. |
− | + | ||
Please download and watch it. | Please download and watch it. | ||
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'''Spoken Tutorial workshops''' | '''Spoken Tutorial workshops''' | ||
− | | The '''Spoken Tutorial Project '''team: | + | | The '''Spoken Tutorial Project''' team: |
conducts workshops using spoken tutorials and | conducts workshops using spoken tutorials and |
Revision as of 17:24, 21 June 2017
Visual Cue | Narration |
Slide Number 1
Title Slide |
Welcome to this spoken tutorial on Heat of Reaction using Vlabs. |
Slide Number 2
Learning Objectives |
In this tutorial, we will learn to,
Determine heat change for the neutralisation of Sodium hydroxide (NaOH) and Hydrochloric acid(HCl). Calculate heat of reaction for three different reactions. |
Slide Number 3
Reactions
Na+(aq) + OH-(aq)
Na+(aq) + Cl-(aq)+H2O
Na+(aq) + Cl-(aq) +H2O(l) |
The three reactions are shown here. |
Slide Number 4
Pre-requisites
|
To follow this tutorial you should be familiar with,
ChemCollective Vlabs interface.
|
Slide Number 5
System Requirement |
Here, I am using
Mac OS 10.10.5 ChemCollective Vlabs version 2.1.0 Java version 8. |
Click on Vlabs folder and
double-click on vlabs.exe file. |
I have opened a Virtual Chemistry lab application window. |
Click on File->Load homework.
Thermochemistry >> Heat of the reaction |
Click on File and select Load homework option.
In the box, select Thermochemistry.
|
Click on Stockroom Explorer and select Problem Description option. | Click on Problem Description in Stockroom Explorer. |
Cursor on Problem Description.
Scroll down the page and highlight the words Procedure, Processing Data, discussion and Conclusion. |
The Problem Descriptionhere states that,
|
Slide Number 6
Hess’s Law
|
This experiment is an illustration of Hess's law.
delta rH = delta r H 1 + delta r H 2 + delta r H 3 ,etc. |
Slide Number 7
Hess’s law
Na+(aq) + OH-(aq)
Na+(aq) + Cl-(aq) +H2O(l)
Na+(aq) + Cl-(aq)+H2O |
Sum of Heats of reactions for,
Rx1 and Rx3 must be equal to heat of reaction for Rx2. Rx=reaction |
Go back to Workbench | Let us go back to Workbench.
Let us select the required chemicals and apparatus for the reaction. |
From the Stockroom Explorer,
Double-click on Distilled water .
Double click on Sodium hydroxide icons. |
From the Chemical Stockroom,
Double-click on Distilled water.
Close the cabinet. |
Click on Glassware icon. Double-click on 50 mL Graduated Cylinder. | From the glassware menu, we will select a 50 mL Graduated Cylinder and a Foam Cup. |
Click on select tools icon, double-click on Scale. | From the instrument menu, select Weighing Boat and a Scale. |
Drag the distilled water tank over to Graduated Cylinder.
Keep the distilled water aside. |
Transfer 50 mL of Distilled water to the Graduated Cylinder.
In the Transfer amount input bar, type 50 and click on Pour. |
Drag Weighing Boat and place it on the scale.
Click on TARE. |
Weigh 1 gram of Sodium hydroxide using Weighing Boat.
Place the Weighing Boat on the Scale, click on TARE. |
Drag Sodium hydroxide bottle over to Weighing Boat.
Type 1 in the Transfer amount input bar. Click on Pour.
Type 1 in the transfer amount input bar. Click on Pour. |
Drag the Sodium hydroxide bottle over the weighing boat.
Type 1 in Transfer amount input bar and click on Pour .
|
Click on Foam Cup.
Click on Solid radio button in the Solutions info panel, to see the weight in grams column. |
Click on Foam Cup.
In the Solution info panel, Click on Solid radio button and observe the weight in grams column. |
Click on the Graduated Cylinder.
Drag the Graduated Cylinder to the Foam Cup. Type 50 in the Transfer bar. Click on Pour.
|
Click on the Graduated Cylinder and record its temperature.
|
T2 = 30.29 o C. | Click on Foam Cup.
Record the highest temperature on the thermometer. Thermometer shows 30.29 degrees Celsius. |
Observe the grams column. | Observe the grams column, it shows zero.
|
Lets see how to calculate heat of the reaction. | |
Slide Number 8
Heat of Reaction (q) Formula
m = mass of the reactants s = specific heat of the product ∆T = change in temperature in the reaction. |
Heat of reaction (q) is calculated using the formula.
q = m * s * ∆T wherein 'm' is mass of the reactants, 's' is the specific heat of the product and '∆T' is the change in temperature in the reaction. |
Slide Number 9
Reaction-1 (Rx1)
m = 50 ml water + 1 g NaOH s = 4.2 KJ/g ∆T = (T1- T2) = (25-30.29) = -5.29 q = (50+1) * 4.2 * (-5.29) q= -1133.12/1000= -1.133 KJ. |
Heat energy calculation for this reaction is given here. |
ΔH = q/moles of NaOH
Number of moles of NaOH is =1/40 = 0.025. ΔH1 =-.133/0.025 = -45.32 KJ mol-1 ΔH1= -45.32 KJ mol-1 |
Calculation of Molar Heat energy (delta H) in KJ/mol is given here.
|
Click on Foam Cup and Graduated Cylinder.
Press delete. |
Lets go back to workbench.
let us delete the used Graduated Cylinder and Foam Cup. |
Double-click on glassware icon.
Double-click on 50 mL Graduated Cylinder and Foam Cup. |
We will now move on to demonstrate second exothermic reaction.
From Glassware menu, Take a new 50 mL Graduated Cylinder and a Foam Cup. |
From the Chemical Stockroom,
Double-click on 0.5 M Hydrochloric acid from the Strong-acids cabinet. |
From the Chemical Stockroom, select Strong-acids cabinet.
Double click to get 0.5 M Hydrochloric acid. Close the Cabinet. |
Drag the 0.5M Hydrochloric acid bottle over the Graduated Cylinder.
Type 50 in the Transfer bar. Click on Pour. |
Transfer 50 mL of Hydrochloric acid into the Graduated Cylinder. |
Drag Weighing boat and place it on the Scale.
Click on TARE.
Type 1 in the Transfer amount input bar. Click on Pour. |
Weigh 1 gram of Sodium hydroxide using Weighing Boat.
|
Click on the Graduated Cylinder.
Highlight the temperature.
Type 50 in the Transfer bar. Click on Pour. |
Click on the Graduated Cylinder, record its temperature.
|
Click on the Foam Cup.
Highlight the temperature. T2 = 36.96 o C |
Click on the Foam Cup.
|
Slide Number 10
Calculation of heat of reaction for Rx2
ΔH2 = -2.561/0.025 = -102.47 KJ mol-1 |
Calculation of Molar Heat energy (delta H) in KJ/mol is given here.
delta H for reaction 2(Rx2) is -102.47 KJ mol-1 |
Select Foam Cup and Graduated Cylinder, scale and 0.5M HCl and press delete | Delete the used apparatus and chemicals from the Workbench. |
Double-click on Glassware icon.
Double-click on 25 mL Graduated Cylinder and a Foam Cup.
Select the Duplicate option.
|
From Glassware menu take a new 25 mL Graduated Cylinder and a Foam Cup
We need two Graduated Cylinders.
|
Drag both the the cylinders. | Drag both the cylinders to a convenient place on the Workbench. |
Right click on the Cylinder.
Use context menu to rename the cylinder as A and B . |
Label the cylinders as A and B. |
On Chemical Stockroom;
Double-click on Strong-acids cabinet. Double-click on 1.0 M HCl.
Double-click on 1.0 M NaOH. |
From the Chemical Stockroom click on Strong-acids cabinet.
Close the cabinet.
Close the cabinet. |
Place 1 M HCl over the Graduated Cylinder.
Type 25 in the Transfer bar. Click on Pour.
Drag the Graduated Cylinder to the Foam Cup. Type 25 in the Transfer bar. Click on Pour.
Highlight the temperature. T1= 25o C |
Transfer 25 mL of Hydrochloric acid(HCl) into graduated cylinder A.
Pour the Hydrochloric acid(HCl) from graduated cylinder to Foam Cup.
|
Place 0.1 M NaOH over the Graduated Cylinder.
Type 25 in the transfer bar. Click on Pour. |
Measure 25 mL of Sodium hydroxide in Graduated Cylinder B. |
Click on the Graduated Cylindero
Drag the Graduated Cylinder to the Foam Cup. Type 25 in the Transfer bar. Click on Pour. |
Pour the measured Sodium hydroxide into the Foam Cup. |
Click on the Foam Cup.
Highlight the temperature
|
Click on Foam Cup.
Allow the reaction to take place for a few seconds. Record the highest temperature.
|
Slide Number 11
Calculation of heat of reaction for Rx3 q = m * s * ∆T
ΔH3 =-1.400/0.025 = -56.03 KJ mol-1 |
Calculation of Molar Heat energy for reaction three is given here.
|
Slide Number 12
Analysis of Results
|
Let us now analyze the results.
Rx=reaction
|
Let us summarize. | |
Slide Number 13
Summary |
In this tutorial we have,
and Hydrochloric acid.
|
Slide Number 14
Assignment
q = (50+4) x 4.2 x (-21.18) = 4803.62 Joules ΔH = 4803.62 /1000 = 4.803
|
For the assignment,
Explain why the reactions are exothermic.
calculate the heat of reaction.
|
Slide Number 15
About Spoken Tutorial project |
The video at the following link summarizes the Spoken Tutorial project.
Please download and watch it. |
Slide Number 16
Spoken Tutorial workshops |
The Spoken Tutorial Project team:
conducts workshops using spoken tutorials and gives certificates on passing online tests. For more details, please write to us. |
Slide Number 17
Forum for specific questions
Please visit this site Choose the minute and second where you have the question Explain your question briefly Someone from our team will answer them
|
Please post your timed queries in this forum. |
Slide Number 18
Acknowledgement |
Spoken Tutorial Project is funded by NMEICT, MHRD, Government of India.
More information on this mission is available at this link. |
This tutorial is contributed by Snehalatha kaliappan and Madhuri Ganapathi from IIT Bombay.
Thank you for joining. |