Carbon Dioxide Gas
06.05 Rate and Collision Theory: Assessment Instructions
Investigation of the Rate of a Reaction
Background:
The reaction you will be investigating is the reaction that occurs when an Alka-Seltzer tablet is placed into a given amount of water. Alka-Seltzer is an over-the-counter antacid and pain relief medication that is dissolved in water before it is ingested. Each tablet contains aspirin (acetylsalicylic acid), citric acid, and sodium bicarbonate. As the tablet dissolves in water, the bicarbonate ions in the tablet react with the hydrogen ions from the acids that are also contained in the tablet. The carbon dioxide gas produced by the reaction is what causes the bubbling that can be observed.
HCO3- (aq) + H+ (aq) → H2O (l) + CO2 (g)
In this investigation, you will design two experiments which will compare two different factors that may affect the rate of the Alka-Seltzer reaction. Possible factors to be investigated include temperature, surface area, agitation, and amount of reactants. Remember to make sure there is only one independent variable in your experimental design for each experiment. You can only test one factor at a time.
The document you submit to your instructor should include the following sections: materials, procedure, and conclusion. Instructions and suggestions are provided below to help you make sure that each section of your document is complete.
Materials:
• Alka-Seltzer tablets
•Empty and clean water or soda bottles (12 oz to 24 oz)
•Balloons (to capture the carbon dioxide gas produced)
•Water
•Clock
•Additional materials may be required, depending on your lab design.
Procedure:
•Design two experiments that will compare two different factors that may affect the rate of the Alka-Seltzer reaction. Possible factors to be investigated include temperature, surface area, agitation, and amount of reactants. Remember to make sure there is only one independent variable in your experimental design for each
Investigation of the Rate of a Reaction
Background:
The reaction you will be investigating is the reaction that occurs when an Alka-Seltzer tablet is placed into a given amount of water. Alka-Seltzer is an over-the-counter antacid and pain relief medication that is dissolved in water before it is ingested. Each tablet contains aspirin (acetylsalicylic acid), citric acid, and sodium bicarbonate. As the tablet dissolves in water, the bicarbonate ions in the tablet react with the hydrogen ions from the acids that are also contained in the tablet. The carbon dioxide gas produced by the reaction is what causes the bubbling that can be observed.
HCO3- (aq) + H+ (aq) → H2O (l) + CO2 (g)
In this investigation, you will design two experiments which will compare two different factors that may affect the rate of the Alka-Seltzer reaction. Possible factors to be investigated include temperature, surface area, agitation, and amount of reactants. Remember to make sure there is only one independent variable in your experimental design for each experiment. You can only test one factor at a time.
The document you submit to your instructor should include the following sections: materials, procedure, and conclusion. Instructions and suggestions are provided below to help you make sure that each section of your document is complete.
Materials:
• Alka-Seltzer tablets
•Empty and clean water or soda bottles (12 oz to 24 oz)
•Balloons (to capture the carbon dioxide gas produced)
•Water
•Clock
•Additional materials may be required, depending on your lab design.
Procedure:
•Design two experiments that will compare two different factors that may affect the rate of the Alka-Seltzer reaction. Possible factors to be investigated include temperature, surface area, agitation, and amount of reactants. Remember to make sure there is only one independent variable in your experimental design for each