4. (15 pts) Density. Two students deternine the density of the same salt water s

Question

4. (15 pts) Density. Two students deternine the density of the same salt water solution and obtain the following results. See Figure 1 on Page 1 a. (5 pts) Student #1 procedure and results: . Determine the mass of a 100.0 ml class A volumetric flask 297.146 g 398.069 g Add salt water to the mark and determine the mass of the flask and solution: What is the salinity of this solution? (5 pts) Student #2 procedure and results: . Determine the mass of a 250.0 mL Erlenmeyer flask Add salt water to 100 mL mark on the Erlenmeyer flask and determine mass: 411.293 g b. 311.668 g What is the salinity of this solution? (5 pts) Compare the results from Student #1 and Student #2. State your claim and use your experimental results to support your claim. e. 5 of 7

Explanation / Answer

1. density and salinity measurement of salt solution

a. density = (398.069 - 297.146) g/100 ml = 1.00923 g/ml

Salinity of solution = 15 ppt

b. density = (411.293 - 311.668) g/100 ml = 0.996 g/ml

salinity of water = 0 ppt

So the salinity of water is found to be higher in case of solution prepared by method a.

Salinity values are taken from density correlation graph.

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