Salinity- Density experiment data table



Warm up- What is density? _______________________________________________Ocean Density Lab Objectives-The students will experiment in order to explain what factors affect the density of ocean waters.Materials500ml beaker30ml beakerStopwatchPart 1: Density Variations with Solutions Procedures Step 1 - Fill the plastic container with cold tap water up to 50ml or other marker near the top of the cylinder.Step 2 - Fill the beaker with about 30ml (saltwater) and pour it slowly into the cylinder, being careful to not dump it in, but rather pour it along the side of the cylinder. Observe and describe what happens. Record the time it takes for the solution to reach the bottom. START the stopwatch when pouring begins and STOP watch when the colored liquid first hits the bottom.Step 3 - Repeat steps 1 and 2 three additional times and measure the time required for the front edge of the saltwater to travel from the surface of the water to the bottom of the cylinder. Record the time for each test in the data table. Make certain that you drain the cylinder after each trial and refill it with fresh water and use the same amount of solution with each trial.Step 4 - Determine the travel time 3 times for solution B, and C exactly as you did with solution A and enter your measurements in Table 9.1.Table 9.1SolutionTrial 1 Trial 2Trial 3Average TimeA5% Salt (Yellow) B15% Salt (Red)C25% Salt (Blue)Questions1. Since the solution that traveled fastest has the greatest density, solution (A, B, C) is most dense. Circle your answer.2. Write a brief summary of the results of your salinity-density experiment.3. What is density (include units)? What are two factors that control the density of seawater?4. Refer to the factors listed in question 3 as well as your lab, and the diagram below. What is the cause of the difference in surface water salinity between equatorial and subtropical regions in the Atlantic Ocean?5. Based on the diagram below, of the two oceans, the (Atlantic, Pacific) Ocean has higher average surface salinities. Circle your answer. 6. Using the diagram above, at which latitudes are the highest surface salinities located? Provide a reason this might be true.7. Why are the surface salinities higher in the lower latitudes (20-30 degrees)?9. How is density and salinity of ocean water related?Calculate the following salinities. If the mass of a sample of water 1000ml contains 200 g of salt, what is the salinity?If a mass of a sample of water 650ml contains 75 g of salt, what is the salinity? ................
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