2. Method

Independent Variable:
  1. The amount of salt concentration in the containers
  2. The type of plant in the containers

Dependent Variable:
  1. The amount of salt concentration in the container daily, over a course of 5 days in ppt/400 millilitres

Controlled Variables:
  1. The amount of water in each container - 400 millilitres
  2. The environment in which the setups are placed in
  3. The timing in which the results are recorded daily
  4. The size of the container
  5. The duration in which the salinity sensor is dipped into the water

2.1 Equipment List


  1. Sodium Chloride (Sea Salt) - 90 grams
  2. Salinity Sensor - 1x
  3. Glass Rods - 1x
  4. Disposable Gloves - 6 pairs
  5. Plastic Containers - 60 containers
  6. Cling Wrap - 1 roll
  7. Water Quality with Vernier - 1x
  8. Deionised Water - 1 bottle
  9. Micranthemum Monte Carlo - 1x
  10. Lemnoideae - 1x
  11. Beaker - 1x
  12. Pond Water - 12 litres
2.2 Procedures

Step 1: We put 30 set-up, 6 containers in 5 rows. Each of the 6 containers with the same salt concentration. The first row has 1 gram of sea salt, the second row has 2 grams of sea salt, the third row has 3 grams of sea salt, the fourth row has 4 grams of sea salt, and the fifth row has 5 grams of sea salt.

Step 2: We then poured 400 milliliters of the eco pond water into each of the plastic container containing different amount of salt.

Step 3: We place equal amounts of each plant after being weighed on a weighing scale into the first four containers (2 types of plants, 2 for each plant) and the last two containers are control setups. 

Step 4: We use clingwrap the containers and poke some small hole to prevent any water from evaporation and affect our results but yet allowing the plants to live.

Step 5: We will use a Salinity Sensor to the salt proportion in the water daily from Monday to Friday, a course of 5 days.

Step 6: We will then observe the trend of the amount of salt concentration in each container.

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