EXERCISE 5 -FINAL.docx - Exercise Five Ocean Salinity Name...

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Exercise Five Ocean Salinity Name: UIN: INITIAL HERE: I affirm that I have not given or received any unauthorized help on this assignment, and that this work is my own. Watch the laboratory lecture video and read the introductory material for background information needed to help you answer your questions. For this exercise you will be measuring the salinity of two unknown solutions using multiple methods. Evaporation Procedure as Demonstrated in the Video 1. Weigh a clean, dry 50 mL beaker and watch glass to the nearest 0.01 g. 2. Using a graduated cylinder, add 15 mL of the first solution (unknown A) to the beaker and reweigh. 3. Evaporate on the hot plate until the beaker and watch glass are completely dry. 4. Reweigh the beaker now that the salt residue is left. 5. Use the mass of the salt, and the original mass of the water to determine the salinity in grams of salt per kilogram of water (g/kg). 1. Record weights: Beaker and watch glass 52.7g Beaker, watch glass and water sample 67.2g Beaker, watch glass and salt 53.1g Weight of the original water sample 14.5g Weight of the salt 0.4g Salinity in g/kg 0.027g/kg
The evaporation procedure was repeated with the second solution (unknown B).

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