Question

1. based on your evidence in part 3 of your lab and the data table below, explain how the density of water changes with increasing salinity. in your response describe the relationship between salinity and density, comparing the density of freshwater and ocean water.

salinity (g/kg) water type density (g/cm³)
0 freshwater 0.997
10 brackish water 1.003
20 slightly salty 1.010
35 ocean water 1.025

Explanation:

As salinity increases from 0 g/kg (freshwater) to 35 g/kg (ocean - water), the density of water increases from 0.997 g/cm³ to 1.025 g/cm³. Freshwater is less dense than ocean water due to the absence of dissolved salts in freshwater. The relationship is direct - as more salts are dissolved (higher salinity), the mass per unit volume (density) of water increases.

Answer:

The density of water increases with increasing salinity. Freshwater has a lower density (0.997 g/cm³) compared to ocean water (1.025 g/cm³) because ocean water has a higher salinity. The relationship between salinity and density is a direct one, where an increase in salinity leads to an increase in the density of water.