Virtual Chemistry Experiences

Virtual Laboratory Library | Online Chemistry Labs

 

 

A brief overview of available lab topics is included below.


Laboratory Techniques

Introduces students to the virtual laboratory environment

Error and Standard Deviation

Error analysis by calculating the standard deviation of measured values that exhibit random deviation about an average value.

Spreadsheets and Linear Regression

Introduction to the use of spreadsheet programs to analyze an experimental data set, plot data, and determine the equation for the linear fit.

Combustion

A carbon-hydrogen analysis procedure used to determine the empirical formula of a combustible organic compound.

Metal + HCl

The pressure of hydrogen produced by the reaction of a known mass of a metal with excess hydrochloric acid to determine the atomic mass of the metal.

Calorimetry

A virtual calorimeter is used to measure the heat evolved when a measured mass of a combustible substance is burned in excess oxygen.

Synthesis and TLC

Students explore the concepts of limiting reagents and stoichiometric ratios of reactants by running a simple 1:1 organic addition reaction and using thin layer chromatography to determine if either reagent was used in excess.

Absorbance

Application of absorption spectrophotometry and the use of the Beer-Lambert Law on sunscreen ingredient.

NMR

Fluorine nuclear magnetic resonance to determine the structures of several sulfur fluorides.

Freezing Point Depression

The freezing points of pure benzophenone and of a mixture of another organic substance dissolved in benzophenone.

Osmotic Pressure

The osmotic pressure of aqueous solutions of several soluble substances is used to determine molecular mass.

Thin Layer Chromatography

TLC is used to study the interactions between a solvent, a solute, and a stationary substrate.

Iodine Clock

Students run the classic "iodine clock" reaction to determine the reaction rate law.

Titration I

The "standardization" of a titrant by use of a primary standard reagent is introduced, and the concentration of a strong acid solution is determined.

Titration II

The titration technique is used to measure the concentration of a weak acid solution, and the weak acid's molar mass and acid dissociation constant, Ka, are determined.

Weak Acid Equilibrium

Solutions of a weak acid, its conjugate base, and the resulting buffer are studied in depth.

Electroplating

The reduction of metal ions in an aqueous solution to deposit metal on an electrode is used to determine the identity of an unknown metallic element.

Potentiometry

Several electrochemical cells are assembled and studied; then an unknown metal ion in solution is identified by the cell potential produced against a known half-cell.

Nuclear Chemistry

This experiment uses neutron activation in a virtual nuclear reactor to measure the decay half-life of two unstable isotopes.

Entropy

The Potentiometry experiment is extended by adding temperature control, and the Gibbs free energy, enthalpy, and entropy changes for reactions are determined.

Density

The densities of regularly-shaped solids are measured.

Vitamin-C Analysis

The vitamin C contents of synthetic and commercial samples are determined by titration with DCP; this lab requires no background in stoichiometry.

Qualitative Analysis of Carbohydrates

Simple tests for organic functional groups and food types.

Enzyme Kinetics

Classic digestion of starch by amylase using iodine as the indicator.

Drug Identification

Use of gas chromatography to determine the identity and concentration of drugs. 

Energy Content of Foods

Calorimetric measurement of the energy content of foods by combustion in oxygen.

DNA Hydrolysis

A sample of DNA from strawberries is hydrolyzed with acid and heating to produce free nucleobases, which may be identified by thin layer chromatography. 

Qualitative Testing of Organic Functional Groups

This experiment introduces students to qualitative testing of different organic functional groups.