Chemical Reactions Lab – Observations and Conclusion Observations

1. Which base products did you use in your experiment?
Base 1:
Base 2:

2. What happened when you added the Phenolphthalein to your base? What color were the base and the solution before and after mixing?
Base 1:

Base 2:

3. Record the starting mass, volume, and description (state of matter, color, general appearance) of your base here:
Base 1 mass:
Base 1 volume:
Base 1 description:

Base 2 mass:
Base 2 volume:
Base 2 description:

4. Record the starting mass, volume, and description (state of matter, color, general appearance) of your acid here:
Trial 1 mass:
Trail 1 volume:
Description:

Trial 2 mass:
Trial 2 volume:
5. What happened when you allowed the two chemicals to mix? Include any observations such as a decrease or increase in temperature, a change in color, bubbling or fizzing, production of a precipitate, or a change in the volume of the bag.
Reaction 1:

Reaction 2:

6. Record the final mass and a description of the products of the mixture here:
Mass:
Description:

Conclusion Questions
1. Did a chemical reaction occur when you mixed your two chemicals in each of your experiments? Use specific evidence from your observations before, during, and after experiment to support your answer – remember the signs of a chemical change.

2. Some of the bases you may have used are baking soda (NaHCO3 – sodium bicarbonate), antiacid (CaCO3 – calcium carbonate), lime (CaO or CaO2H2 – calcium oxide or calcium hydroxide), window cleaner (NOH5 – ammonium hydroxide), or soap (KOH or NaOH – potassium hydroxide or sodium hydroxide). Which of the chemical equations below represent the two reactions you observed, and what were the reactants and products you saw for each?
a. HCl + NaHCO3 → H2O + NaCl + CO2
b. 2HCl + CaCO3 → H2O + CaCl2 + CO2
c. 2HCl + (CaO or CaO2H2) → (1 or 2)H2O + CaCl2
d. HCl + NOH5 → H2O + NH4Cl
e. HCl + (KOH or NaOH) →H2O + (KCl or NaCL)
Reactants and products:

3. Were each of your reactions (if you observed a reaction occurred) endothermic (requiring energy), exothermic (releasing energy), or neither? Use specific evidence from your observations to support your answer.

4. Compare the mass of your reactants with the mass of your products. Do your experiments support the idea of conservation of mass? Why or why not?

5. How were the two reactions (or non-reactions) that you observed similar, and how were they different? Compare the reactants, products, and what you observed when you mixed them. Which required or produced more energy?

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