Marine Biology Sample Lab Report


Removing The Salt From Saltwater Experiment 1.2

 

I. Materials Used

 

• 2 Tbs. Kroger Sea salt

• 1 Cup Kroger purified water

• 1 metal measuring tablespoon

• 1 small metal pot

• 1 metal spoon for stirring

• 1 small clear glass bowl

• 1 shelf outside in the sun since it was pretty weather. Otherwise would have used a

sunny windowsill.

 

II. Procedure

 

Step 1. Used a liquid measuring cup of water and pour 1 cup of Kroker purified water

into the saucepan.

Step 2. Placed the pot of water on the stove on medium heat. Heat water until it is

steaming but not boiling.

Step 3. Added 2 tablespoons of Kroger Sea Salt to the water while it is heating.

Step 4. Stirred the water until the salt is dissolved and the water becomes clear again.

Step 5. Turned off the stove and removed the saucepan.

Step 6. Placed 2 tablespoons of the saltwater mixture in a small clear glass bowl. Make

sure that there is no undissolved salt in this liquid.

Step 7. Cleaned up everything except the bowl with salt water in it.

Step 8. Let the bowl of saltwater sit outside on a shelf in the sun for two days.

Step 9. Observed what’s in the bowl after 2 days outside in the sun.

Step 10. Cleaned up and return everything to is proper place.

 

III. Observation

 

After the water evaporated, the salt left a thin, hard layer on the bottom

surface of the bowl. These salt crystals looked and felt different than those

originally used. The salt crystals that remained after the water evaporated are

more square in shape than the original salt that was more diamond shape

that was used. The size was also much smaller and milky white in color than

they were originally from the box. The left over crystals felt very breakable

and were very easy to crumble just using the fingers to rub them together.

The salt in the original form was very hard and would not crumble like these

crystals left over in the experiment.

 

IV. Conclusion

 

When removing salt from salt water, as the water evaporates the salt

molecules come together sticking to the hard surface of the container that is

holding the salt water. The salt crystals that have re-formed are different than

the salt crystals that came from the container that were originally used.

Since the crystals were broken down and dissolved by water then put back

together as the water evaporated their size, shape and hardness changed.

Water levels can change however the amount of salt will always remain the

same as long as the container remains the same. So the lower the level of

water to a set amount of salt, the higher the salinity would be. The more

water level in a container for a set amount of salt the less salinity or salty

that water would be.

 

Tags: Experiment, lab report, Marine Biology
Last update:
2018-03-14 19:50
Author:
Kristi
Revision:
1.2
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