1 Answer

Things You'll Need
Eye protection
Sodium carbonate solution, 0.5 mol dm^-3, 25 cm^3
Magnesium sulfate solution, 0.5 mol dm^-3, 25 cm^3
2 conical flasks, 100 cm^3
Filter funnel, 65 cm diameter
Filter papers, same size as funnel
Paper towel

Instructions
1
Put on eye protection.

2
Pour the sodium carbonate and the magnesium sulfate into a conical flask.

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3
Place the filter funnel in the empty conical flask. Place a filter paper onto the filter funnel.

4
Swirl the sodium-magnesium mixture gently.

5
Pour the mixture into the filter funnel slowly. Do not fill the filter more than half full while pouring. Allow the entire contents to filter into the second conical flask. The filter will catch the insoluble salt. The content of the conical flask should be clear. If it is not, then repeat the filtering process.

6
Remove the filter from the funnel and place it on a paper towel. Let it dry completely (a few hours). The compound on the filter is magnesium carbonate, an insoluble salt.

Read more: http://www.ehow.com/how_6168170_make-insoluble-salt.html#ixzz2a0G7HVTN