# Resource Type: Virtual Labs

The 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. More information and offline downloads.

Please scroll below to find our collection of pre-written problems, they have been organized by concept and ranked by difficulty.

• ## Stoichiometry

### The Mole, Molarity, and Density

• #### Glucose Dilution Problem

In this activity, students use the virtual lab to create a 0.025M glucose solution from a standard 1M glucose solution. First, they calculate the correct volumes of 1M glucose solution and water to mix together…

• #### Acid Dilution Problem

In this activity, students use the virtual lab to create 500mL of 3M HCl solution from a concentrated stock solution of 11.6M HCl. They must first calculate the correct volumes of 11.6M HCl solution and water to…

• #### Cola and Sucrose Concentration Problem

In this activity, students use the virtual lab to prepare a sucrose solution for a soda recipe. They next calculate the concentration of their solution in terms of molarity, percent mass and density. Finally, they…

• #### Making Stock Solutions from Solids

In this activity, students use the virtual lab to create stock solutions starting from solid salts. Students must first calculate the correct amount of solid to make the solution. Next, they prepare the solution…

• #### Identifying the Unknown Metal (Metals Density Problem)

In this activity, students use the virtual lab to identify an unknown metal by measuring its density and comparing their measurements to the densities of known metals.

• #### Identifying an Unknown Liquid from its Density

In this activity students use the virtual lab to design an experiment to determine the identity of mislabeled bottles using the densities of the solutions inside.

• #### Alcohol Density Problem

Determine the concentration of an alcohol solution from its density.

• ### Reaction Stoichiometry and Limiting Reagents

• #### Gravimetric Determination of Arsenic

Set in the context of ground water contamination in Bangladesh, this stoichiometry and analytical chemistry activity examines the issues around identifying wells contaminated with arsenic. (Part of a larger online…

• #### Determining Stoichiometric Coefficients

In this activity, students use the virtual lab to determine how 4 unknown substances react with each other including their stoichiometric coefficients.

• #### Stoichiometry and Solution Preparation Problem

In this limiting reagents problem, students mix together solutions in different ratios in an attempt to produce a final solution that contains only 1 product.

• #### Textbook Style Limiting Reagents Problems

Textbook-style practice limiting reagent exercises with that can be used as a way to "predict and check" your answers using the virtual lab.

• #### Textbook Style Limiting Reagents Problem II

In this activity, students practice with experiments involving limiting reagents and the test their knowledge to determine the concentration of an unknown solution.

• #### Predicting DNA Concentration

In this limiting reagents problem, students are given specific concentrations of DNA solutions and are asked to predict what products and reactants will remain after a specific volumes are mixed and reaction has…

• #### Unknown Concentration of DNA Solution Problem

In this advanced limiting reagent problem, students use the virtual lab to determine the concentration of a solution of DNA by reacting it with known amounts of a fluorescent dye which binds to the DNA.

• ## Thermochemistry

### Energy and Enthalpy

• #### Determining the Heat of Reaction in Aqueous Solution

In this activity, students perform an experiment to determine the heat of a reaction.

• #### Coffee Problem

Use the virtual lab to determine how much milk to add to hot coffee to reach the desired temperature

• #### Measuring the heat capacity of an engine coolant.

As an analytical chemist at a company developing new engine coolants your task is to determine the heat capacity of a newly developed product and then to determine if its heat capacity is greater of less than that…

• #### Measuring the heat capacity of an engine coolant II (Advanced version)

Measure and compare the heat capacity of an unknown liquid with an unknown density.

• #### Camping Problem I

In this part of the MRE scenario, students measure the enthalpy of a reaction.

• #### Camping Problem II

In this part of the MRE scenario, students determine change in the enthalpy of a reaction as the concentration of reactants are varied.

• #### Camping Problem III

In this part of the MRE scenario, students create solutions that when mixed, increase to a certain temperature.

• #### ATP Reaction (Thermochemistry and Bonding)

Determine the enthalpy of the ATP reaction.

• #### Heats of Reaction - Hess' Law

This activity provides a demonstration of Hess' Law using three reactions: the solubility NaOH in water, the solubility NaOH in HCl and the reaction of a solution of HCl and a solution of NaOH.

• ## Equilibrium

### LeChatlier's Principle

• #### Cobalt Chloride and LeChatlier’s Principle

In this activity, students safely explore the equilibrium reaction of the cobalt chloride reaction.

• ### Equilibrium Calculations

• #### DNA Binding Problem

In this activity, students explore equilibrium constants in biochemical systems by measuring the binding constant of a DNA-Dye reaction.

• ## Acid-Base Chemistry

### Strong Acids and Bases

• #### Strong Acid and Base Problems

Textbook-style strong acid and base problems that can be checked using the Virtual Lab.

• #### Determination of the pH Scale by the Method of Successive Dilutions

This activity was created as an accompaniment to an in-class demonstration of the method of successive dilutions using HCl, NaOH, a pH meter, and universal indicator solution. After the demonstration, students…

• ### Weak Acids and Bases

• #### Weak Acid and Base Problems

Textbook-style weak acid and base problems that can be checked using the Virtual Lab.

• #### Determining the pKa and Concentration Ratio of a Protein in Solution

Use the virtual lab to determine the pKa of a protein then create a buffer solution with a specific concentration ratio of the protein in its protonated/ unprotonated form.

• #### Unknown Acid and Base Problem

In this exercise, students graph the titration curve of an unknown acid and base to determine their pKa’s and concentrations.

• ### Buffer Solutions

• #### Determining the pKa and Concentration Ratio of a Protein in Solution

Use the virtual lab to determine the pKa of a protein then create a buffer solution with a specific concentration ratio of the protein in its protonated/ unprotonated form.

• #### Creating a Buffer Solution

An exercise to design a buffer solution with specific properties.

• #### DNA - Dye Binding: Equilibrium and Buffer Solutions

Students examine equilibrium and buffer solutions in a biological setting.

• ### Acid/Base Titrations

• #### Standardization of NaOH with a KHP solution: Acid Base Titration

Use the Virtual Laboratory to standardize an unknown NaOH solution (approximately 0.2M) to four significant figures via titration with 25.00 mL of a KHP standard solution.

• ## Solubility

### Solubility Product

• #### Temperature and the Solubility of Salts

Examine the solubilities of salts based on temperature.

• #### Determining the Solubility Product

Determine the solubility product constatnt (Ksp) for various solids.

• #### Determining the solubility of copper chloride at different temperatures

GIven the solubility of CuCl at 2 different temperatures, predict its solubility at a third temperature. Then test your prediction by creating the solution in the virtual lab

• ## Oxidation/Reduction and Electrochemistry

### Standard Reduction Potentials

• #### Exploring Oxidation-Reduction Reactions

Design an experiment to order Cu, Mg, Zn and Pb from strongest to weakest reducing agent.

• ## Analytical Chemistry/Lab Techniques

### Acid/Base Titrations

• #### Standardization of NaOH with a KHP solution: Acid Base Titration

Use the Virtual Laboratory to standardize an unknown NaOH solution (approximately 0.2M) to four significant figures via titration with 25.00 mL of a KHP standard solution.

• ### Gravimetric Analysis

• #### Unknown Silver Chloride

Determine the concentration of Silver ion in a Silver Nitrate solution using gravimetric analysis