Chemistry Experiments
95 experiment protocols with step-by-step instructions
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Beer-Lambert Law Verification
Demonstrating the linear relationship between absorbance and concentration
Verify the Beer-Lambert law by measuring the absorbance of CuSO₄ solutions at various concentrations and constructing a calibration curve.
Colorimetric Determination of Glucose
Measuring blood glucose analog using the DNS method
Determine glucose concentration using the dinitrosalicylic acid (DNS) colorimetric method and understand reducing sugar chemistry.
Colorimetric Determination of Phosphate
Measuring phosphate levels in water using the molybdenum blue method
Determine the phosphate concentration in a water sample using the ammonium molybdate colorimetric method.
Colorimetric Protein Assay (Bradford Method)
Quantifying protein concentration using Coomassie Brilliant Blue dye binding
Determine the protein concentration of an unknown sample using the Bradford assay and a BSA calibration curve.
Determination of Iron in Water
Measuring dissolved iron concentration using thiocyanate colorimetry
Determine the concentration of iron(III) in a water sample using the thiocyanate colorimetric method.
Food Dye Analysis by Spectrophotometry
Identifying artificial food colors by their absorption spectra
Determine the identity and concentration of artificial food dyes in commercial beverages by measuring their absorption spectra.
Spectrophotometric Analysis of a Mixture
Resolving a two-component mixture using simultaneous equations
Determine the individual concentrations of two dyes in a mixed solution using absorbance measurements at two wavelengths and simultaneous equations.
Spectrophotometric Determination of Aspirin
Measuring aspirin content in commercial tablets by UV absorption
Determine the amount of acetylsalicylic acid (aspirin) in commercial tablets using UV spectrophotometry after hydrolysis to salicylate.
Alum Crystal Growing
Creating large transparent alum crystals
Grow large, transparent octahedral potassium alum crystals from a supersaturated solution.
Bismuth Rainbow Crystal Growing
Creating iridescent hopper crystals from molten bismuth
Grow iridescent bismuth hopper crystals by melting bismuth metal and controlling the cooling rate to form geometric staircase structures.
Crystallization of Salol (Phenyl Salicylate)
Observing crystal growth under a microscope in real time
Observe the real-time growth of salol crystals under a microscope, studying nucleation, crystal growth rates, and the effect of temperature …
Fractional Crystallization of Salt and Sand
Separating a mixture using solubility differences
Separate a mixture of salt and sand using fractional crystallization, demonstrating dissolution, filtration, and evaporative crystallization.
Growing Copper Sulfate Crystals
Producing large blue crystals by slow evaporation
Grow large, well-formed copper sulfate pentahydrate crystals using the slow evaporation method, demonstrating supersaturation and crystal lattice formation.
Recrystallization of Benzoic Acid
Purifying a solid by dissolving in hot solvent and cooling
Purify impure benzoic acid by recrystallization from hot water, demonstrating the standard purification technique for organic solids.
Sugar Crystal Rock Candy
Growing edible sugar crystals on a string
Grow large sugar (sucrose) crystals on a string to create rock candy, demonstrating supersaturation and nucleation with an edible product.
Supersaturation and Instant Crystallization
Triggering instant crystal formation in sodium acetate
Prepare a supersaturated sodium acetate solution and trigger instantaneous crystallization, demonstrating metastable supersaturation and exothermic crystallization (hot ice).
Burning Magnesium in Dry Ice
Magnesium continues to burn in solid carbon dioxide, reducing CO₂ to carbon
Demonstrate that magnesium can reduce carbon dioxide, challenging the misconception that CO₂ always extinguishes fires.
Chemiluminescence with Luminol
Producing blue light through a chemical reaction without heat
Demonstrate chemiluminescence by oxidizing luminol with hydrogen peroxide in the presence of a catalyst, producing visible blue light.
Density Column Rainbow
Stacking liquids of different densities to create a colorful column
Demonstrate the concept of liquid density by layering immiscible liquids of different densities in a tall column.
Disappearing Beaker (Refractive Index Matching)
Making a glass object invisible by immersing it in a liquid of matching refractive index
Demonstrate the concept of refractive index by making a glass object disappear in a liquid that matches its refractive index.
Elephant Toothpaste
Rapid catalytic decomposition of hydrogen peroxide producing a massive foam column
Demonstrate the catalytic decomposition of hydrogen peroxide using potassium iodide, illustrating concepts of catalysis, exothermic reactions, and gas evolution.
Instant Freeze: Supercooled Water
Triggering instantaneous crystallization of supercooled water
Demonstrate supercooling by cooling purified water below 0°C without freezing, then triggering instant crystallization.
Iodine Clock Reaction
A timed reaction that suddenly turns dark blue after a predictable delay
Demonstrate reaction kinetics and the effect of concentration and temperature on reaction rate using the iodine clock reaction.
Non-Newtonian Fluid: Oobleck
Creating a shear-thickening fluid from cornstarch and water
Create and explore a non-Newtonian fluid that behaves as both a solid and a liquid depending on the applied force.
Oscillating Briggs-Rauscher Reaction
A chemical clock that cycles between colorless, amber, and deep blue
Observe a chemical oscillating reaction that repeatedly cycles through three distinct color states, demonstrating nonlinear chemical kinetics.
Sodium and Water Reaction
Observing the vigorous reaction of an alkali metal with water
Demonstrate the reactivity of alkali metals by reacting sodium with water, observing hydrogen evolution and hydroxide formation.
Thermite Reaction
An extremely exothermic redox reaction producing molten iron from rust and aluminum
Demonstrate an extreme exothermic oxidation-reduction reaction where aluminum reduces iron oxide to molten iron.
Activity Series Verification
Testing metal reactivity with displacement reactions
Verify the electrochemical activity series by testing whether metals can displace other metals from solution.
Concentration Cell
Generating voltage from concentration differences
Construct a concentration cell using copper half-cells at different concentrations and verify the Nernst equation prediction for cell potential.
Daniell Cell Construction
Building a classic zinc-copper galvanic cell
Construct a Daniell cell to measure the standard cell potential and observe the electrochemical reactions at each electrode.
Electrolysis of Copper Sulfate
Quantitative electrolysis with copper electrodes
Perform quantitative electrolysis of copper sulfate solution using copper electrodes and verify Faraday's first law of electrolysis.
Electrolysis of Water
Splitting water into hydrogen and oxygen gases
Decompose water into hydrogen and oxygen gases using electrolysis, and verify the 2:1 volume ratio predicted by stoichiometry.
Electroplating with Copper
Depositing a thin layer of copper onto a metal object
Electroplate a metal key or coin with copper, demonstrating the industrial process of electrodeposition and Faraday's laws.
Lemon Battery
Building a simple galvanic cell from citrus fruit
Construct a simple galvanic cell using a lemon, copper coin, and zinc nail to demonstrate how chemical energy converts to …
Rust Prevention Methods
Comparing galvanizing, oil coating, and sacrificial anodes
Compare different rust prevention methods and understand how galvanic protection (sacrificial anodes) works electrochemically.
Voltaic Cell Potential Measurement
Measuring EMF of various half-cell combinations
Measure the electromotive force (EMF) of multiple galvanic cell combinations and compare with standard reduction potential values.
Barium Flame Test
Identifying barium by its yellow-green flame
Observe the pale yellow-green flame produced by barium ions and understand why barium compounds require extra safety precautions.
Calcium Flame Test
Identifying calcium by its orange-red flame
Observe the brick-red to orange-red flame produced by calcium ions, a common element found in limestone, marble, and bones.
Copper Flame Test
Identifying copper by its blue-green flame
Observe the characteristic blue-green flame produced by copper(II) ions, one of the most visually striking flame tests.
Flame Test Comparison Lab
Testing multiple metals to build a flame color reference chart
Perform flame tests on six different metal salts to create a reference chart of characteristic flame colors for qualitative analysis.
Lithium Flame Test
Identifying lithium by its crimson-red flame
Observe the characteristic crimson-red flame color produced by lithium ions, and compare it to other alkali metal flame tests.
Potassium Flame Test
Identifying potassium by its lilac/violet flame
Observe the lilac/violet flame color produced by potassium ions, and learn to use cobalt blue glass to distinguish it from …
Sodium Flame Test
Identifying sodium by its bright yellow flame
Observe the characteristic bright yellow flame produced when sodium compounds are heated, demonstrating how metal ions produce specific flame colors.
Strontium Flame Test
Identifying strontium by its scarlet-red flame
Observe the bright scarlet-red flame produced by strontium ions, commonly used in red fireworks and emergency flares.
Boyle's Law Verification
Demonstrating the inverse relationship between pressure and volume
Verify Boyle's law (P1V1 = P2V2) by measuring the volume of a trapped gas at different pressures.
Cartesian Diver
Demonstrating gas compressibility and Boyle's law
Build a Cartesian diver to demonstrate gas compressibility and the relationship between pressure and buoyancy.
Charles's Law with a Balloon
Measuring volume changes of a gas with temperature
Demonstrate Charles's law by measuring the circumference of an air-filled balloon at different temperatures.
CO₂ and Limewater Test
Detecting carbon dioxide with calcium hydroxide
Generate carbon dioxide gas from a carbonate-acid reaction and confirm its identity using the limewater test.
Diffusion Rate Comparison (Graham's Law)
Comparing diffusion rates of HCl and NH₃ gases
Verify Graham's law of diffusion by comparing the rates at which HCl and NH₃ gases travel through a glass tube.
Gas Stoichiometry with Magnesium
Calculating molar volume by reacting Mg with HCl
Determine the molar volume of hydrogen gas at room conditions by reacting a known mass of magnesium ribbon with excess …
Hydrogen Gas Collection
Generating and collecting hydrogen from zinc and acid
Generate hydrogen gas from the reaction of zinc with hydrochloric acid and collect it by water displacement.
Molar Volume of a Gas at STP
Experimentally determining 22.4 L/mol using butane
Determine the molar volume of butane gas at STP by measuring the mass and volume of gas released from a …
Vapor Pressure and Boiling Point
Measuring how vapor pressure changes with temperature
Measure the vapor pressure of water at different temperatures and verify the Clausius-Clapeyron equation.
Aldol Condensation (Dibenzalacetone)
Synthesizing a UV-absorbing compound used in sunscreens
Synthesize dibenzalacetone via a crossed aldol condensation between benzaldehyde and acetone, demonstrating carbon-carbon bond formation.
Banana Oil (Isoamyl Acetate) Synthesis
Making the ester responsible for banana flavor
Synthesize isoamyl acetate (banana oil) via Fischer esterification of acetic acid and isoamyl alcohol, demonstrating how esters create fruit flavors.
Biodiesel Production from Vegetable Oil
Converting cooking oil to biodiesel via transesterification
Convert vegetable oil to biodiesel (fatty acid methyl esters) by base-catalyzed transesterification with methanol.
Extraction of Caffeine from Tea
Isolating a natural alkaloid using liquid-liquid extraction
Extract caffeine from tea leaves using liquid-liquid extraction with dichloromethane, demonstrating solvent extraction and natural product isolation.
Fischer Esterification of Ethyl Acetate
Synthesizing an ester with a fruity aroma
Synthesize ethyl acetate (the aroma of nail polish remover) via Fischer esterification of acetic acid and ethanol, catalyzed by sulfuric …
Making Nylon 6,10 (Nylon Rope Trick)
Pulling a continuous strand of nylon from an interface
Synthesize nylon 6,10 at the interface of two immiscible solutions and pull a continuous strand from the beaker.
Preparation of Acetaminophen (Paracetamol)
Synthesizing an analgesic by amide bond formation
Synthesize acetaminophen (paracetamol) by the acetylation of p-aminophenol with acetic anhydride, demonstrating amide bond formation.
Slime Synthesis (Cross-linked PVA)
Creating a non-Newtonian fluid by cross-linking polyvinyl alcohol
Create slime by cross-linking polyvinyl alcohol (PVA) with sodium borate, demonstrating polymer chemistry and non-Newtonian fluid behavior.
Soap Making by Saponification
Converting fats into soap using sodium hydroxide
Make soap by the saponification of vegetable oil with sodium hydroxide, demonstrating the hydrolysis of ester bonds in triglycerides.
Synthesis of Aspirin (Acetylsalicylic Acid)
Making one of the world's most common drugs
Synthesize aspirin (acetylsalicylic acid) by acetylation of salicylic acid with acetic anhydride, and assess purity by melting point determination.
Synthesis of Luminol
Creating a chemiluminescent compound from 3-nitrophthalic acid
Synthesize luminol (3-aminophthalhydrazide) and demonstrate its chemiluminescent reaction with hydrogen peroxide.
Anion Identification Tests
Detecting common anions through selective chemical reactions
Identify unknown anions using specific precipitation, acid-decomposition, and redox tests.
Beilstein Test for Halogens
Detecting halogen atoms in organic compounds using a copper wire flame test
Determine whether an organic compound contains halogen atoms (Cl, Br, I) using the Beilstein copper wire test.
Borax Bead Test for Metal Ions
Identifying transition metals by colored glass beads formed in a borax fusion
Identify transition metal ions by the characteristic colors they produce when fused into a borax (sodium tetraborate) glass bead.
Cation Identification by Precipitation
Systematic separation of Group I–V cations using selective reagents
Identify unknown cations in a solution using the classical qualitative analysis scheme with group reagents.
Chromatography of Plant Pigments
Separating chlorophyll and carotenoids using paper chromatography
Separate and identify plant pigments using paper chromatography, and calculate Rf values for each pigment.
Flame Emission Spectroscopy
Quantitative identification of metals using spectroscope and flame
Use a spectroscope to observe and measure the emission line wavelengths of different metal ions in a flame.
Hard Water Testing with Soap Solution
Comparing water hardness by measuring soap lather formation
Determine the relative hardness of water samples by measuring the volume of soap solution required to produce a lasting lather.
pH Indicator Rainbow
Mapping indicator color changes across the full pH range
Observe how different pH indicators change color at specific pH values and understand the concept of indicator transition ranges.
Starch-Iodine Test for Carbohydrates
Detecting starch in food samples using iodine solution
Use the iodine test to identify starch in various food samples and understand the molecular basis of the blue-black color …
Unknown Substance Identification Challenge
Using physical and chemical properties to identify mystery powders
Apply multiple qualitative tests to identify unknown white powders, developing systematic analytical thinking skills.
Bomb Calorimetry Simulation
Measuring the energy content of food using calorimetry
Measure the energy (calorie) content of different food items by burning them and measuring the heat transferred to water.
Coffee Cup Calorimetry
Measuring enthalpy of neutralization using a simple calorimeter
Determine the enthalpy of neutralization of HCl and NaOH using a polystyrene cup calorimeter.
Cold Pack Chemistry
Studying the endothermic dissolution of ammonium nitrate
Measure the temperature change when ammonium nitrate dissolves in water, demonstrating an endothermic dissolution process used in instant cold packs.
Dissolving Is Not Always Exothermic
Comparing temperature changes of different salt dissolutions
Compare the enthalpy of dissolution of different salts (NaOH, CaCl₂, NH₄NO₃, KNO₃) to show that dissolution can be exothermic or …
Endothermic Reaction Demonstration
Barium hydroxide and ammonium thiocyanate cold reaction
Demonstrate a dramatically endothermic reaction where the mixture becomes cold enough to freeze water on the outside of the flask.
Enthalpy of Fusion of Ice
Measuring the energy required to melt ice
Determine the enthalpy of fusion of ice by adding a known mass of ice to warm water and measuring the …
Exothermic Crystallization of Sodium Acetate
Measuring the heat released during instant crystallization
Quantify the heat released during the crystallization of supersaturated sodium acetate using calorimetry.
Heat of Combustion of Magnesium
Determining ΔH using Hess's law and magnesium oxide
Determine the enthalpy of combustion of magnesium indirectly using Hess's law, since direct measurement is impractical.
Hess's Law Verification
Confirming that enthalpy is a state function using three reactions
Verify Hess's law by measuring the enthalpy changes of three related reactions and showing that ΔH1 + ΔH2 = ΔH3.
Specific Heat Capacity of Metals
Comparing heat capacities of aluminum, copper, and iron
Determine the specific heat capacity of several metals using the method of mixtures and compare with accepted values.
Acid-Base Titration with Methyl Orange
Titrating a weak base with a strong acid
Determine the concentration of a sodium carbonate solution by titrating it with hydrochloric acid using methyl orange indicator, suitable for …
Acid-Base Titration with Phenolphthalein
Determining the concentration of an acid using a standard base
Determine the concentration of an unknown hydrochloric acid solution by titrating it with a standardized sodium hydroxide solution, using phenolphthalein …
Back Titration of Antacid Tablets
Measuring the acid-neutralizing capacity of commercial antacids
Determine the acid-neutralizing capacity of a commercial antacid tablet using a back titration method.
Conductometric Titration
Tracking a titration using electrical conductivity
Perform an acid-base titration using conductivity measurements instead of an indicator, and determine the endpoint from a conductivity-volume graph.
Double Indicator Titration of Carbonate-Bicarbonate Mixture
Using two indicators to analyze a carbonate mixture
Analyze a mixture of sodium carbonate and sodium bicarbonate by titrating with HCl using two indicators sequentially: phenolphthalein and methyl …
EDTA Complexometric Titration of Water Hardness
Measuring calcium and magnesium content in water
Determine the total hardness of a water sample by titrating dissolved Ca2+ and Mg2+ ions with EDTA using Eriochrome Black …
Iodometric Titration of Bleach
Determining the concentration of sodium hypochlorite in household bleach
Determine the sodium hypochlorite (NaOCl) concentration in commercial bleach using iodometric titration with sodium thiosulfate.
pH Titration Curve
Plotting a complete acid-base titration curve with pH meter
Record pH measurements during an acid-base titration and construct a complete S-shaped titration curve showing the equivalence point and buffer …
Precipitation Titration (Mohr Method)
Determining chloride concentration using silver nitrate
Determine the chloride ion concentration in a solution using the Mohr method, where silver nitrate is the titrant and potassium …
Redox Titration with Potassium Permanganate
Determining iron(II) concentration using KMnO₄
Determine the concentration of an iron(II) sulfate solution by titrating with standardized potassium permanganate, a self-indicating reagent.
Vitamin C Titration with Iodine
Measuring ascorbic acid content in fruit juice
Determine the vitamin C (ascorbic acid) content of fresh fruit juice using an iodine titration with starch indicator.