EXAMPLE Making Solutions Using a Pure Solid:

A procedure for an experiment calls for 0.500 M sodium carbonate. How would you make 250 mL of this solution using pure sodium carbonate and water?

See the solution below.


We start by calculating the mass of sodium carbonate that is needed to make 250 mL of 0.500 M Na2CO3.

                       = 13.2 g Na2CO3

We then proceed as follows:

  • Weigh out 13.2 g Na2CO3 and place it in a 250-mL volumetric flask (Figure 15.22).
  • Add enough water to dissolve the sodium carbonate, keeping the level well below 250 mL total. (100 mL of water is a good amount in which to dissolve the Na2CO3.)
  • Swirl the mixture to dissolve the Na2CO3.
  • Add enough water to the container to bring the level of solution to the 250-mL mark on the flask.

Click here to see a sample study sheet for this task.

Click here to see an exercise that will allow your to try this task yourself.

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