Thursday, September 5, 2013

Make Insoluble Salt

Magnesium carbonate


An insoluble salt dissolves very little in water. In fact, the salt dissolves so slowly that it is commonly stated that insoluble salts do not dissolve in water. Insoluble salts can be made by adding two soluble salt solutions together, which causes a precipitation reaction. The newly formed solid is called a precipitate. A salt is considered insoluble if the concentration of aqueous solution is less than 0.001 M at room temperature.


Instructions


1. Put on eye protection.


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


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.








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