Kinetics Guided Inquiry

Kit is designed for Guided Inquiry Experiments

Purpose: Design and perform a series of experiments to determine the effects of various variables on the rate of a chemical reaction

 

Alka-Seltzer tablets contain a mixture of solids that produce bicarbonate and hydrogen ions when they dissolve in water. The following is the net equation for the reaction that occurs.

 

HCO₃^–_(aq) + H⁺_(aq) —-> H₂O _(l) + CO_{2 (g)}

 

 

Alka-Seltzer is a combination of aspirin (acetylsalicylic acid) and baking powder (citric acid and sodium bicarbonate), designed to treat pain and simultaneously neutralize excess stomach acid (the “Alka” being derived from the word “alkali”). It is provided in the form of large effervescent tablets, about 1 inch (25mm) in diameter, which are dissolved (two at a time for the usual adult dosage) in a glass of water. As the tablets dissolve, the acid and bicarbonate react vigorously producing carbon dioxide gas (hence the “Seltzer”), which also produces enough agitation to allow the active ingredients to dissolve readily.

 

Given the following Items

 

10 tablets of Alka Seltzer tablets

3 Plastic Beakers

Mutiple weighing boats

Balance

Stop Watch

Magnifying Glass

1.0 M Ethanoic Acid

Distilled Water Container

Warm and Cold Distilled Water

10 ml Measuring Syringes

Mortor and Pestle

Spatula

Container of Sodium Hydrogen Carbonate

Thermometer

 

 

You have 20 minutes to design.

Experiment #1  

Design an experiment with a written procedure and data table to determine the effects of temperature on the rate of a chemical reaction.

 

Experiment #2

Design an experiment with a written procedure and data table to determine the effects of Nature of reactants on the rate of a chemical reaction.

 

Experiment # 3

Design an experiment with a written procedure and data table to determine the effects of Surface Area  on the rate of a chemical reaction.

 

Experiment #4

Design an experiment with a written procedure and data table to determine the effects of concentration on the rate of a chemical reaction