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
- 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
- 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.
the Making Solutions Page.