Question

2 Determine the concentration of NaCl in a solution using the density of the solution

Decide which is the best piece of volumetric glassware to use to determine the concentration and density of a solution of NaCl.

You will have available to you the following: solid NaCl, distilled water, the contents of your cabinet and shared drawer, analytical balances, thermometers, a computer with Excel

describe the relationship between density and concentration.

I need procedures of this experiment. I have no idea where to start and set things up.

Please help!!

Thank you.

Answer 1

1. Weigh out the mass of NaCl for solution number 1.

2. Tare the balance again (while the flask containing the salt is still on the balance).Remove the flask from the balance. Then add approximately 30 mL of distilled water to the flask and weigh it.

3.Thoroughly mix the solution by swirling or stirring with a glass stirring rod until all of the solid has dissolved.

4.Measure and record the temperature of the solution (to the nearest 0.1 oC

5.Measure the mass of a 10.00 mL aliquot (sample) of the standard solution.

6.Repeat the above steps for standard solutions 2-5.

7.Give the laboratory assistant a clean,dry 50 or 100 mL beaker for your unknown solution.

8.Measure the temperature of the unknown.

9.Measure the mass of a 10.00 mL aliquot of the unknown using the procedure described in step 5 above

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