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Plop! Plop! Fizz! Fizz! Oh, the things chemistry teachers can do with AlkaSeltzer  !. Patricia Mason, PAEMST 2003 Delphi Community High School masonp@delphi.k12.in.us. Judith Flint Baumwirt Granada Hills Charter High School jbaumwirt@ghchs.com.

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plop plop fizz fizz oh the things chemistry teachers can do with alkaseltzer

Plop! Plop! Fizz! Fizz!Oh, the things chemistry teacherscan do with AlkaSeltzer!

Patricia Mason, PAEMST 2003

Delphi Community High School

masonp@delphi.k12.in.us

Judith Flint BaumwirtGranada Hills Charter High School

jbaumwirt@ghchs.com

July 2005, ChemEd Conference, UBC, Vancouver, Canada

experiments and activities
Experiments and Activities
  • Alka Seltzer Rainbow - ChemFax Demonstration (provided by Flinn Scientific)
  • Alka Seltzer Rockets
  • Buffering Ability of Alka Seltzer Tablets
  • Buffer Balancing Acts - ChemFax Demonstration (provided by Flinn Scientific)
  • Common Ion Effect on the Solubility ofAlka Seltzer
experiments and activities3
Experiments and Activities
  • Change in pH and Temperature as a Reaction Occurs
  • Differentiating Liquids
  • Decomposition of Effervescent Tablets
  • Decomposition of Effervescent Tablets with Sample Data Analysis/Results
  • Density Challenge
  • Does a Gas Have Mass?
experiments and activities4
Experiments and Activities
  • Effect of Particle Size on Rate of Reaction Demonstration
  • Effect of pH on rate of reaction
  • Effect of Temperature on Rate of Reaction Demonstration
  • Rate of Reaction Lab - Combined Activities for Students
  • Equilibrium and Rate Determining Step demonstrations
experiments and activities5
Experiments and Activities
  • Micro Popper (provided by Flinn Scientific)
  • Quantitative Determination of Sodium Bicarbonate in Alka Seltzer
  • Second Quarter Laboratory Evaluation:  Analysis of Alka Seltzer(provided by Flinn Scientific)
  • What Chemists Do: Identification and Analysis - White Powder Identification
alka seltzer rockets
Alka-Seltzer Rockets
  • Factors affecting the rates of solution
  • It is important to break tablets evenly into four quarters
  • Only Fuji canisters provide a good seal(lid fits securely inside the canister)
  • Inverted in the launcher
  • Can be used test variables
factors affecting rate of reaction
Effect of Temperature on Rate of Reaction

Teacher demonstration

Student activity

Effect of Particle Size on Rate of Reaction

Whole tablet

Broken in half

Quartered

Coarsely ground

Finely ground

Factors Affecting Rate of Reaction
effect of ph on rate of reaction
Effect of pH on Rate of Reaction
  • Complicated set-up
  • Glass work done by teacher saves time
  • Solutions available of various pH
  • Each group uses water plus 2 others
  • Water displacement technique
  • Plotting data and analysis
  • Comparison of rates with pH
common ion effect
Common Ion Effect
  • Can be used as a discrepant event
  • Why do the tablets dissolve at different rates and in varying amounts?
monitoring changes in ph and temperature as reaction occurs
Must use probeware for pH

Temperature

Tablets are added to room temperature water

Data taken for 5 minutes

Variables can be changed

Number of tablets

Division of tablets

Amount of water

Amount of agitation

Monitoring Changes in pH and Temperature as Reaction Occurs
buffering ability of alka seltzer tablets
Macro-Demonstration

Burets HCl and NaOH

Universal indicator

HCl with water

HCl with tablet

NaOH with tablet

NaOH with water

Can also use pH probes

Micro-Activity

Broken tablets (0.15g to 0.20 g samples)

Well-plates

Universal indicator

Calibrate the micro-pipettes for drops

Buffering Ability of Alka-Seltzer Tablets
does a gas have mass
Does a Gas Have Mass?
  • Can be used initially for introduction to Chemistry
  • Can be used to demonstrate conservation of mass
  • When a gas is produced is mass lost?
  • Baggie provides a closed system
differentiating liquids lab
Differentiating Liquids Lab
  • Good introductory lab activity
  • Properties of Liquids
  • Viscosity
  • Density
  • Solubility
  • Detailed data recording and evaluation
  • Inquiry section, if time permits
equilibrium and rate determining step demo
Equilibrium and RateDetermining Step Demo
  • An entertaining student-centered activity
  • Shows the progress of a reaction from reactants to a mixture of reactants and products
  • Can visually recognize that the reaction is favored in the decompositon direction
  • The “Slow step” is obvious in this demonstration
what chemists do a beginning analysis lab
What Chemists Do – A Beginning Analysis Lab
  • This is a good application of inquiry and the scientific method.
  • May be useful as a beginning lab on analysis
  • Students have three unknowns to determine so the lab requires some extended prep time.
quantitative determination of sodium bicarbonate
AP Chemistry

Stoichiometry Calculations

Limiting Reactant

Graphing

Acid-base

Solutions

Decomposition

Quantitative Determination of Sodium Bicarbonate