ChemCollective Virtual Labs

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The ChemCollective virtual lab is an online simulation of a chemistry lab.

It is designed to help students link chemical computations with authentic laboratory chemistry.

The lab allows students to select from hundreds of standard reagents (aqueous) and manipulate them in a manner resembling a real lab.

ChemCollective virtual labs are part of the National Science Digital Library (NSDL) .

Simulation-based exercises offer new ways to promote learning and motivation.

Interactive exercises can allow students to explore and reinforce fundamental concepts that are increasingly complex, realistic and engaging.

ChemCollective virtual labs software is available free of charge to all educators and students.

Teachers and students can use it on the web without any licensing requirements.

The Spoken Tutorial Effort for ChemCollective Vlabs has being contributed by Dr. Snehalatha Kaliappan and Madhuri Ganapathi

Learners: Chemistry students from 9th standard on-wards.

Basic Level

1. Overview of ChemCollective VLabs

  • About ChemCollective Vlabs software
  • ChemCollective Vlabs offline interface
  • Features, Menubar, Stockroom explorer
  • Glassware menu, Workbench
  • How to select different themes
  • Show contents of Help menu
  • Benefits of ChemCollective Vlabs
  • Play the video clippings of the tutorial series on the Spoken Tutorial website

2. Download and Installation of VLabs

  • Open the Chemcollective website
  • About topics and resource material available on the website
  • About ChemCollective Vlabs online interface
  • Download and run ChemCollective Vlabs on Windows 10
  • Download and run ChemCollective Vlabs on Mac OS X 10.10.5
  • Information about Download and run ChemCollective Vlabs on Ubuntu Linux v 16.04.

3. Preparation of Standard Solutions

  • Prepare a standard solution of 1 molar sodium chloride
  • Load Homework using ChemCollective vlabs
  • Use of glassware and lab apparatus from default lab setup
  • Calculate the weight of sodium chloride using the molar mass
  • Calculate molarity
  • Use Tare button to reset the weight value to zero
  • Show the correct procedure to position the glassware
  • Transfer the contents using precise transfer and realistic transfer
  • About solution info panel

4. Dilutions and pH Measurements

  • Dilute 0.1 molar Hydrochloric acid to 0.01 molar Hydrochloric acid
  • Dilute 0.1 molar sodium hydroxide to 0.01 molar sodium hydroxide
  • Obtain the acid and base from the cabinets
  • Add the required apparatus and glassware to the workbench.
  • Transfer the amount of using precise transfer
  • Note the change in pH from the pH Meter
  • Rename the glassware using the context menu options
  • Change in pH for solutions of acid and base on dilution
  • Variation in pH by common-ion effect for weak acids and bases
  • Use contextual menu to copy and paste the glassware

5. Density of Solids and Liquids

  • From the Load homework option, select Molarity and Density.
  • Use Archimedes' Principle to find the densities of metals.
  • About Archimedes' Principle.
  • Rename the glassware using the context menu.
  • Arrange the apparatus on the workbench by dragging.
  • Select scale and weighing boat from Select Tools menu.
  • Use short-cut keys to copy and paste the apparatus.
  • Calculate the densities using the formula.

6. Effect of Temperature on Solubility

  • Select the required glassware
  • Use the Duplicate option from the context menu to make the copies of glassware
  • Select the tools and duplicate them
  • Arrange the glassware and tools on the workbench
  • Transfer the amount of substance using precise and realistic transfer
  • Use of foam cup as a Calorimeter
  • Check if solubility is exothermic or endothermic
  • Study the relationship between solubility and heat transfer
  • Tabulate and analyze the results

7. Acid-base Titrations

  • Standardization of the acid-base solutions using titration method
  • Retrieve required chemicals from stockroom.
  • Retrieve the required glassware and arrange them on the workbench.
  • Use the acid-base indicators to detect the end point.
  • Withdraw and pour the solutions using the pipet.
  • Transfer the solution using the transfer amount input bar.
  • Calculate the molarity using the formula.
  • Check the Absorbance in the Solution info panel.
  • Measure the pH changes.

8. Buffer Solutions

  • Select Buffer Creation Problem from the Load Homework option.
  • Define buffer solution.
  • Estimate the pH using Henderson–Hasselbalch equation.
  • Prepare 0.5 M Acetate buffer of pH 3.6.
  • Test the buffering action with small amounts of acid and base.
  • Select the required glassware from the glassware cabinet.
  • Rename the glassware using the context menu.
  • Dilute the solutions to lower the molarity.

Intermediate Level

1. Heat of Reaction

  • Define Hess’s law.
  • Retrieve the chemicals from the stockroom explorer.
  • Retrieve the required glassware and tools.
  • Record the temperature using the thermometer provided.
  • Use the foam cup as a calorimeter.
  • Determine heat change for neutralization reaction of Sodium hydroxide(NaOH) and Hydrochloric acid(HCl).
  • Calculate the energy change for exothermic reaction.
  • Calculate of heats of reaction in KJ/mol.
  • Delete the used apparatus and chemicals from the Workbench.
  • Rename the glassware using the context menu.
  • Analyse the results.

2. Metal Displacement Reactions

  • Define Redox Reaction.
  • Define metal displacement reaction.
  • Retrieve the required glassware and solutions for the reactions.
  • Rename the glassware using the context menu.
  • Arrange the apparatus and chemicals on the workbench.
  • Transfer the chemicals using precise transfer method.
  • Carry out the metal displacement reactions.
  • Arrange the elements from strongest to weakest reducing agent.

3. Determination of Equilibrium Constant

  • Determine the equilibrium constant for Cobalt chloride reaction.
  • Check the effect of temperature and concentration on equilibrium.
  • Application of Le-Châtelier’s Principle on the equilibrium.
  • Use the pipet to withdraw and pour the solution into the flask.
  • Check the colour change on the addition of hydrochloric acid.
  • Calculate Equilibrium Constant using the given formula.
  • Define Le-Châtelier’s Principle.
  • Calculate the equilibrium constant at higher temperature.
  • Compare the values of equilibrium constants at different temperatures.
  • Carry out the reaction between cobalt complex and silver nitrate and analyse the results.

4. Determination of Solubility Product

  • Determine Solubility of salts.
  • Significance of solubility product.
  • Retrieve the required glassware and tools.
  • Duplicate and rearrange the apparatus on the workbench.
  • Define solubility product.
  • Calculate the Solubility Product of each sparingly soluble salt.
  • Tabulate the results.

5. Gravimetric Analysis

  • About the principle of Gravimetric Analysis.
  • Steps involved in Gravimetric Analysis.
  • About groundwater poisoning with arsenic.
  • Chemical equations used for the determination of the amount of soluble arsenic.
  • Add the required glassware and chemicals to the workbench.
  • Use a pipet to withdraw and pour the solutions
  • Determine the concentration of arsenic in unknown samples of contaminated water.
  • Determine the mass percent of Arsenic in the samples.
  • Tabulate and analyze the results.

Advanced Level

1. Determination of pKa of Acetic acid

  • About Henderson-Hasselbalch equation.
  • Retrieve chemicals from the Stockroom Explorer.
  • Retrieve the glassware from the glassware menu.
  • Use precise transfer mode to transfer the chemicals.
  • Dilute 1 molar acetic acid to 0.1 molar acetic acid.
  • Titrate 0.1 molar sodium hydroxide against 0.1 molar acetic acid.
  • Note the change in pH values on addition of sodium hydroxide to acetic acid.
  • Plot a graph of volume of sodium hydroxide added versus pH values.
  • Find pH at half-equivalence and equivalence points.
  • Calculate the Ka and pKa values.

Contributors and Content Editors

Madhurig, PoojaMoolya, Snehalathak