The Wonders of Water

Overview

Objectives/Goals The object of my experiment is to determine whether temperature affects the salinity and pH level of ocean water. Methods/Materials Materials:Ocean water, three 5 gallon buckets, two heaters, hydrometer, pH testing kit. Procedure: 1. Fill three 5 gallon buckets with 5 gallons of ocean water each 2. Leave one bucket (labeled #A#) at room temperature 3. Leave one bucket (labeled #B#) at 80 degrees Fahrenheit 4. Leave one bucket (labeled #C#) at 90 degrees Fahrenheit 5. Every other day, measure the salinity using a hydrometer and the pH level using a pH kit of all three buckets 6. Record results and observations in a data log Results Based on my results, I have learned that my hypothesis is incorrect and that temperature does affect both the salinity and pH level of ocean water. I have come to this conclusion because two of the three buckets that I used for my experiment, Bucket #B# and Bucket #C,# now have different salinity levels and pH levels than they did at the beginning of my experiment. I have also found that the two heated buckets, Bucket #B# and Bucket #C,# now have less water than they did at the start of my experiment. This is because the heat caused the water to evaporate. I have learned that when the water evaporates, the salt does not evaporate with the water. Instead, the salt stays in the bucket. I know that this statement is true because the salinity level is greater each time I measure it. As for the pH level, it increased in the two heated buckets as well. The pH level and salinity level is greatest in the hottest bucket, Bucket #C,# and lowest in the bucket left at room temperature, Bucket #A.# Conclusions/Discussion I have come to the final conclusion that temperature does indeed affect both the salinity and pH level of ocean water.

Competition history

• CSEF 2005 Chemistry · Entry S0510

Resources

• CSEF project summary ↗

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