Name:

Precipitate with Conservation 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. ◻ After the funnel has stopped dripping set the filter paper aside to dry.
  19. ◻ When the filter paper is dry, record the mass of the filter paper + precipitate.
  20. ◻ Use the hot plate to gently boil off the liquid in the catch beaker.
  21. Record the mass of the catch beaker and evaporate.
 

Data:

  1. Reaction observations:
     
     
  2. __________ mass of filter paper.
  3. __________ mass of filter paper + precipitates.
  4. __________ mass of catch beaker.
  5. __________ mass of catch beaker + evaporate.

Analysis:

  1. Write the balanced chemical equation for this reaction.  







  2. Where is the NaCl ?  







  3. This is a precipitation event following a chemical reaction. Describe a precipitation event following a physical change of state. 







  4. What are your expectations regarding the sum of masses of the reactants vs. the sum of the masses of the products?