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.

Solution:

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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