Explore BrainMass

Separating Sodium Carbonate, Chloride and Sulphate

Assuming an imaginary mixture of sodium chloride, sodium carbonate and sodium sulphate I need to know what test to use to 1st confirm the the compostion and 2nd to find the percentage composition mixture. I need to know which test would be useful and the calaulations needed so I can preform the in the lab.

Solution Preview

Your solution is attached. Thanks for using BrainMass!

Unfortunately, the presence of Cl- , CO32- and SO42- in the same solution makes testing difficult because two or more of these ions may test positive with the same reagent.
See http://www.dartmouth.edu/~chemlab/chem3-5/qual_an/overview/procedure.html for great pictures.
However, carbonate can be confirmed by addition of nitric acid to the solution with evolution of CO2 gas.

CO32- + 2 H+ ---> H2CO3 ----> H2O + CO2(g)

Neither Cl- nor SO42- will form a gas upon addition of acid.

To perform confirmation tests for the other ions, it is necessary to remove competing ions from the solution. The order of removal must be ...

Solution Summary

Methods for performing the above separation and calculations are shown in detail.