Title: The Effect of CO2 on Aragonite Sand and Regular Beach Sand.

Problem Statement: What will occur as CO2 is added to seawater, seawater with aragonite based sand, and seawater with beach sand?

Method and Materials:  see Materials page - CLICK HERE


  1. 4 three-gallon water containers

  2. Pure aragonite sand

  3. Beach sand

  4. 1500+ grams of aquarium salt

  5. CO2 tank with pump

  6. ph testing kit with pH drops

  7. Hydrometer

  8. Distilled water

  9. plastic tubing

  10. 2 nylon socks

  11. 4 tubing valves

  12. electronic scale

  13. oven and/or hairdryer

  14. waterproof tape

Method: (click HERE for pictures and videos of our experiment. )

For Making Saltwater

  1. 1.Take 8 gallons of distilled water and add 1233.37 grams of aquarium salt.

  2. 2.Mix together in appropriate container. Stir. Well.

  3. 3.Use Hydrometer to check salinity. Should be approx. 33 ppt (parts per thousand).

  4. 4.Pour into the 4 three gallon containers.

For Experiment

  1. 1.Set up 4 three-gallon containers on a flat surface, not in sunlight, near CO2 pump, and then label containers Control, E1, E2, and E3.

  2. 2.Fill all 4 labeled containers with the salt-water mix. Two gallons (or 7.570824 liters) per container.

  3. 3.Using pH drops or pH paper measure the pH of each salt water container.

  4. 4.Weigh beach sand by itself, of aragonite sand by itself, and nylon sock by itself on a electronic scale (weigh in grams).

  5. 5.Then put the beach sand into one nylon sock, and the pure aragonite sand into the other nylon sock, and weigh each combination individually on the electronic scale

  6. 6.Fill E2 with the beach sand encased in one nylon sock. Measure mass. Tape sock to inside rim of container for easy accessibility.

  7. 7.Fill E3 with the pure aragonite sand encased in another nylon sock, measure mass, and tape it to inside rim of container for easy accessibility.

  8. 8.Drill hole into caps of containers for tubing. Make sure tubing fits.

  9. 9.Attach CO2 pump to top of E1, E2,

and E3 containers, making sure tubing and valve

connections are secure.

  1. 10.Open valves. Start CO2 pump and relieve pressure

as needed.

  1. 11. Measure pH of salt water after CO2 is pumped into the E1, E2 and E3.

  2. 12. Weight the sand in the sock, and find result.

Hypothesis: CLICK HERE

Results: see result - CLICK HERE

Discussion: see analytic essay page - CLICK HERE

Conclusion: see IMPACT page - CLICK HERE