Class Copy

Precipitate Activity

Equipment

  1. safety goggles
  2. ring stand with ring clamp and funnel
  3. (2) small beakers
  4. triple-beam balance
  1. 0.80g calcium chloride (CaCl2)
  2. 2.10g sodium carbonate (Na2CO3)
  3. warm distilled water
  4. filter paper

Procedure

  1. Safety goggles will be worn during this activity.
  2. Mass the first small beaker, add 0.80 g of calcium chloride (CaCl2).
  3. Pour 30 ml of warm distilled water into this beaker.
  4. Stir the beaker solution until the powder is dissolved.
  5. Rinse any residue on the spoon back into the beaker solution.
  6. Mass the second small beaker, add 2.10 g of sodium carbonate (Na2CO3).
  7. Pour 30 ml of warm distilled water into the second beaker.
  8. Stir the second beaker's until the powder is dissolved.
  9. Rinse any residue on the spoon back into the beaker solution.
  10. Pour the contents of one beaker into the other beaker.
  11. Rinse any residue in the now dry beaker back into the beaker with solution. Stir.
  12. Record your observations of the reaction.
  13. Mass the filter papers. Write the mass, your period number and initials on the filter paper.
  14. Fold the filter paper and place it in the funnel on the ring clamp.
  15. Place the the empty beaker underneath the funnel.
  16. Pour the mixed beaker solution with precipitate into the filter funnel.
  17. Swirl a small amount of distilled water in the mixing beaker. Pour this rinse into the filter funnel.
  18. Set the filter paper aside to dry.
  19. Pour the catch beaker liquid into the waste container as directed by your instructor.

Data:

  1. Reaction observations:

Chemical Analysis:

  1. Write the balanced chemical equation for this reaction.
  2. Where is the NaCl ?
  3. What are your expectations regarding the sum of masses of the reactants vs. the sum of the masses of the products? Explain your answer.

Earth Science Analysis:

  1. Write the balanced chemical equation for this reaction.
  2. What was captured by the filter paper?
  3. What test could you devise to verify your answer above?
  4. Where is the NaCl ?
  5. What does this activity have to do with the rock cycle?