What is the purpose of Alka-Seltzer lab?
What is the purpose of Alka-Seltzer lab?
Our purpose in this lab will be to determine the mass percent of the sodium bicarbonate in an Alka-Seltzer tablet and compare our results to the published mass percentages given by the Akla-Seltzer company.
What is the hypothesis in the Alka-Seltzer experiment?
According to the experiment and results, the Alka-Seltzer tablets dissolved more quickly as the temperature increased. These results fully supported my hypothesis which stated that the higher the temperature of water, the faster the rate of the chemical reaction.
What is the independent variable in an Alka-Seltzer experiment?
The independent variables were the temperature of the water and the surface area of the Alka-Seltzer tablets. The dependent variable was the time it took for the Alka-Seltzer tablet to dissolve in water.
What makes Alka-Seltzer dissolve?
Alka Seltzer tablets easily dissolve in water. Water releases hydrogen ions that can react with the base inside the Alka Seltzer tablet, sodium bicarbonate. When the sodium bicarbonate reacts with the hydrogen ions, carbon dioxide forms, which causes the bubbles you see when you drop an Alka Seltzer tablet in water.
Why did the speed of the chemical reactions during the Alka-Seltzer lab change?
Since the reaction occurs on the surface of the tablet pieces, more access to it will make the reaction go faster because there are more molecules to make bumping together more likely. Higher temperature gives more energy to the molecules, meaning they are more likely to have enough energy for the reaction to continue.
Is Alka-Seltzer a solute?
The two main things used in this experiment will be the solute and the solvent, which is Alka Seltzer and water. There are quite a few controlled variables used in the experiment.
What happens when Alka-Seltzer reacts with water?
drop the tablet in water, they mix and react, forming carbon dioxide gas which bubbles up to the surface of the water. If the water and Alka-seltzer are in a tightly sealed container, the gas will expand rapidly. These bubbles attach themselves to the blobs of colored water and cause them to float to the surface.
What evidence indicates that a chemical reaction took place?
Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color change, formation of a precipitate, formation of a gas, odor change, temperature change.
What is the meaning of independent and dependent variables?
The independent variable is the cause. Its value is independent of other variables in your study. The dependent variable is the effect. Its value depends on changes in the independent variable.
How does Alka-Seltzer change the temperature of water?
With the alka-seltzer and water, the temperature should decrease inside the cup, meaning heat was absorbed in the reaction (endothermic). The cups will feel cold on the outside as well. With the hydrogen peroxide and yeast, the cup will feel warm, indicating an exothermic reaction where heat is released.
Is Alka-Seltzer a chemical or physical change?
| LAB | Alka Seltzer and water | Baking soda and vinegar |
|---|---|---|
| Physical or Chemical Change | Chemical Change | Chemical Change |
| WHY? | Fizzes, gas produced (new substance), irreversible, | Fizzes, gas produced (new substance), irreversible, endothermic reaction. |
Why does Alka-Seltzer work so well?
01 INTRODUCTION. When too much acid builds up in your stomach, you can get heartburn. Alka-Seltzer is a “buffer” which neutralizes stomach acid and temporarily keeps it from becoming too acidic.
