Salt Water Lab

The purpose of this lab was to model the significant differences in density that oceans experience when glaciers and polar ice caps melt. It demonstrated that the variation in density greatly affects salt water. I discovered that the increase in freshwater causes a decrease in density. I made three claims. First, the higher the salinity of the water is, the denser it will be. This was shown in my data by the fact that, with 0mL of fresh water, the density was 1.108 g/mL For every milliliter of fresh, pure water added, the density decreases by 0.015 grams per milliliter. I believe the density responded this way due to the fact that on average, seawater has a density of 1.025 g/mL. In this experiment, I added large amounts of freshwater (50mL total). Freshwater has almost no salt content, so its density is 1.000 g/mL. With each addition of freshwater, the density had to have gone down since a growing number of the total content had a lower density. I predicted that the density would fall after adding freshwater. This proved to be true, as modeled before in my graph. The density decreased by 0.015 g/mL per
We used a different temperature of freshwater when we added 10mL to the water, totaling 80mL. My partner poured in the 10mL of water, and before we realized it, it was too late. We had forgotten that cold water is denser than warm water. The fresh water we had used before had been from the tap, so about 20℃. The water my partner took was almost freezing, so probably about 1℃! It was such a silly mistake; I couldn't believe I’d forgotten about temperature. Luckily, it didn’t seem to skewer the data too drastically. The average decrease in density was 0.015 g/ml per milliliter. The difference between the density at 20mL of fresh water and 30mL of freshwater was -0.004 g/mL. Thus, the percent error is 137.5%. I am very embarrassed, but luckily, the idea of the lab was