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Investigating Chemical Reactions with Limewater: A Practical Experiment

In this lab investigation, students will explore how chemical reactions occur by rearranging atoms in reactants to produce new products. Using limewater, they will observe the effects of bubbling exhaled air through a solution, noting any visible changes as signs of chemical processes. The experiment involves safety precautions, proper measurement, and cleanup steps. Students will conclude whether a chemical reaction took place based on their observations and understanding of reactants and products.

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Investigating Chemical Reactions with Limewater: A Practical Experiment

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  1. Lab Limewater Investigation I will notice that when a chemical reaction occurs, the atoms of substances (reactants) rearrange to form new substances (products).

  2. First things first… • Reactant: a starting substance in a chemical reaction • Product: a substance produced in a chemical reaction • Example: HCl + NaOH H2O + NaCl Reactants yields Products

  3. Procedures • Put on protective eyewear. • Put both pieces of rubber tubing on the same piece of rigid plastic tubing. Like shown in the diagram at the end of the directions. • Using the syringe, measure 30mL of limewater. Pour limewater into the plastic bottle. • Seal the bottle with the rubber stopper, making sure that the smaller of the 2 flexible tubes is inside the bottle. • Take turns using your straw mouthpieces to gently bubble one breath of air into the bottle through the longer of the plastic tubes. • Repeat step 5 until everyone in your group has had two turns.

  4. Diagram

  5. Clean Up • Rinse syringe with water • Throw away straw pieces. • Detach rubber stopper from bottle and empty the bottle contents into the sink. • Use the vinegar/acid wash in your bin to swish away any left over residue in the bottle. • Return the vinegar/acid wash to the vinegar bottle in your bin. • Rinse the plastic bottle once more with fresh water from the sink. • Put cleaned (&dry-ish) supplies back in your bin.

  6. Results & Conclusions • Describe what changes you observed in the bottle. • Starting substances change into new substances during chemical reactions. Do you think a reaction occurred I the bottle? Why or why not?

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