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Disappearing Hydrosphere – A Mystery Experiment
Experimental Set-Up
Salinity by Evaporation
Materials: hot plate, aluminum foil or boats, small samples of mystery waters (5 ml), triple beam balance
Procedures:
Using your pencil, mark each aluminum dish with the name of the sample (i.e. A, B, C)
Weigh and record the dry mass of each sample dish in the table
Add 5 ml of each sample to the appropriate dish
Weigh and record the wet mass of each sample dish in the table
Place the dishes on the hot plate and wait for the water to evaporate
Weigh and record the evaporated mass of each sample dish in the table
Calculate the salinity of each sample using the following ratio:
Salinity by Refractometer
Materials: eye dropper, samples of mystery water, refractometers
Procedures:
Open the flap and clean the blue screen of the refractometer with a soft cloth
Use the eye dropper to place ONE drop of sample on the blue screen
Close the screen and hold the refractometer into the light
Look through the eyepiece to calculate the salinity
Read and record the salinity of your sample (Use the diagram below)
Wipe off the screen and repeat with the other samples.
To read your salinity, read the value on the right side of the window where the blue and white line meets. This sample has a salinity of 30 ppt.
Salinity by Density:
Equipment: triple beam balance, graduated cylinder, calculator
Procedures:
Weigh your empty graduate cylinder
Add 50 ml of sample to your cylinder and weigh
Determine the mass of your sample and the volume
Calculate the density of your sample
Repeat for the other two samples
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Eyepiece
Flap & Screen
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