| Experimental Summaries |
| Crystal
Violet Kinetics |
| The kinetics of the
decomposition of crystal violet is studied using the MicroLab
colorimeter. The experimental data are plotted to determine the order
of reaction in crystal violet and the reaction is studied at two
different concentrations of hydroxide ion to determine the order of the
reaction in hydroxide...more(PDF) |
| Crystal
Violet Kinetics with Activation Energy a
Calculations |
| The kinetics of the
decomposition of crystal violet is studied using the MicroLab
colorimeter. The experimental data are plotted to determine the order
of reaction in crystal violet. The reaction is studied at two different
concentrations of hydroxide ion to determine the order of the reaction
in hydroxide and the activation energy, Ea, is
calculated for the reaction from supplied data. ...more(PDF) |
| Formaldehyde
Clock Kinetics |
| The kinetics of the
formaldehyde clock reaction are measured using the MicroLab colorimeter
to explore the variation of rate with a chenge in concentration of
formaldehyde.
...more(PDF) |
| Kinetic
Studies of the Ferroin Complex |
| The kinetics of a series of
reactions involving ferroin is studied using the MicroLab colorimeter.
Each student group will complete two of three possible reaction series
at two different concentrations and temperatures. The order of the
reaction for ferroin and three different non-ferroin reactants will be
determined graphically. The rate constants for each series at each
temperature will be determined and the activation energy will be
estimated by comparing the rates at different temperatures. ...more(PDF) |
| Catalyzed
Decomposition of Hydrogen Peroxide |
| This experiment introduces
the concepts of units of pressure, catalysts, and kinetics. Pressure is
used to monitor the kinetics of the catalytic decomposition of hydrogen
peroxide. The MicroLab interface is used to collect and analyze data
and determines which catalyst is most effective. ...more(PDF) |
| Introduction
to Calorimetry |
| Hot and cold water are mixed
and heat loss/gain are measured. Ice is melted in water and heat of
fusion is calculated. A candle is burned under a metal cup and the heat
of combustion for wax is determined ...more(PDF) |
| Hess'
Law |
| A time and temperature
program is used in conjunction with a Styrofoam cup calorimeter.
Changes in temperature are determined graphically for Mg/HCl and
MgO/HCl reactions. Hess' Law is used to find the heat of combustion for
Mg ...more(PDF) |
| Enthalpy
of Hydration |
| Qualitatively correlate the
ΔHsoln of several compounds with their
properties such as ionic charge, size, etc.. Students will also
quantitatively determine the enthalpy of solvation of MgSO4
and MgSO4•7H2O,and
calculate the Qsoln per gram, the ΔHsoln
per mole for MgSO4, and ΔHhydration
for the conversion of MgSO4 to MgSO4•7H2O ...more(PDF) |
| Hot
and Cold Packs |
| The MicroLab interface is
used to measure temperature changes in a calorimeter. ΔT
values are determined graphically for the dissolution of four salts,
ΔHsoln is calculated for each salt.
ΔHf values are calculated for the ions
in each salt, and ΔHf values for the
ions are used to determine ΔHsoln for
two additional salts. A hot and cold pack is designed by students using
their results. ...more(PDF) |
| Determination
of Enthalpy and Entropy of a Reaction |
| A simple electrochemical
cell (Cu / Zn) is constructed in a Chem-Carrou-Cell™ or well
plate and voltages are measured at different temperatures. Enthalpy and
Entropy are calculated from a graph of voltage vs. temperature. |
| Titration
Curve and Dissociation Constant for Acetic Acid |
| Solutions of HCl and Acetic
acid are titrated with NaOH and a titration curve is generated using
hand entered data. An acetic acid solution of unknown concentration is
titrated with NaOH and the molarity of the acetic acid is calculated
and the Ka of the acid is found at different
points along the curve. ...more(PDF) |
| Introduction
to Acids and Bases and Titration of Acetic Acid |
| Explore the nature of acids
and bases by observing the effects of buffers in a pH range of 2-11 on
various indicator papers and solutions. Explore acid reactions using
common acids, HCl, H2SO4,
and HNO3 with substances such as marble chips,
aluminum, and egg albumin. Explore the same reactions with bases and
also perform a simple titration with NaOH and acetic acid. Use MicroLab
to get a good feel for titration curves.
...more(PDF) |
| Acid/Base
Titration Curves |
| An NaOH solution is
standardized against HCl and a titration curve for acetic acid is
generated. Various cleaners are analyzed for their HCl, NaOH, or NaOCl
content. ...more(PDF) |
| Titration
of a Cola Product |
| A decarbonated cola product
is titrated with standardized NaOH. The volume of the titration can be
determined either by manual titration or by drop counter. The molarity
of the acid ion the cola is determined from the first equivalence point. ...more(PDF) |
| Analysis
of a Solid Mixture |
| The percent of KHP in an
unknown solid mixture is determined by indicator and by potentiometric
titration ...more(PDF) |
| Characterization
of Weak Acids |
| The identity of an unknown
acid is determined by finding its molar mass and its dissociation
constant by titration with a standardized base. ...more(PDF) |
| Analysis
of Soda Ash |
| An unknown sample of soda
ash is analyzed for Na2CO3
content using standardized HCl ...more(PDF) |
| Ka1
of Phosphoric Acid by Titration |
| A 0.1 M solution of
phosphoric acid is titrated to the first two equivalence points. The Ka1
is determined from the pH at the half equivalece point volume...more(PDF) |
| Ka2
of Sulfuric Acid by Titration |
| Students will gain
experience in the titration of a diprotic acid with one weak and one
strong dissociable hydrogen. The second dissociation constant for
sulfuric acid will be found and Pauling's rules for oxyacid strength
will be explored.
...more(PDF) |
| Titration
of an Acid Mixture |
| A mixture of HCl and H3PO4
is titrated with NaOH to determine each component's concentration in
the mixture. First derivative curves are used to find the equivalence
points ...more(PDF) |
| Boyle's
Law |
| The relationship between
pressure and volume is explored by taking pressure/volume data pairs at
various settings and graphing the data ...more(PDF) |
| Charles'
Law |
| The relationship between
temperature and volume is explored by taking temperature/volume data
pairs at various settings and plotting the data ...more(PDF) |
| Combined
Boyle's and Charles' Laws |
| Designed to accomplishes
exploration of both these laws in a single lab period ...more(PDF) |
| Gay-Lussacs
Law |
| The relationship between
temperature and pressure is explored by taking temperature/volume data
pairs at various settings and plotting the data ...more(PDF) |
| Vapor
Pressure of Water |
| The relationship between
temperature and vapor pressure is explored and the vapor pressure of
water is determined at three different temperatures ...more(PDF) |
| Beer's
Law using Food Dye Spectrophotometry |
| A set of five standard food
dye solutions are made by dilution and their absorbance measured and
graphed. A food dye solution of unknown concentration is measured and
its concentration determined.
...more(PDF) |
| Beer's
Law Using Crystal Violet |
| A set of five standard
crystal violet solutions are made by dilution and their absorbance
measured and graphed. A crystal violet solution of unknown
concentration is measured and its concentration determined.
...more(PDF) |
| Formation
Constant of [Fe(SCN)]2+ by Spectrophotometry |
| Five standard solutions are
prepared to determine the absorbance and molar absorptivity constant
for [Fe(SCN)]2+. The value of Kf
is calculated for the formation of the complex. ...more(PDF) |
