Chemistry/Honors
Name:
Solubility of a Salt
Objective: Determine the solubility of sodium chloride in water.
Background Questions: Answer on left side of notebook (even # page)
1) Explain what is meant by “like dissolves like”.
2) You need to dissolve a large crystal of CuSO4 in water as quickly as possible. What could you do
to speed up the process?
3) Study figure 5 on page 406. Then use it to explain why some solutions conduct electricity and
others do not.
4) Use figure 15 on page 414 to determine the solubility of
a. NaNO3 at 40˚C
b. NaCl at 90˚C
c. KNO3 at 10˚C
Hazards/Special Instructions: Copy from Board
Procedure and Data: (Use words and pictures to make a flow chart for the procedure. Then copy the
data table.) This should go on right side (odd # page)
1) Place 20 mL of water in a beaker.
2) Add salt to the water slowly while constantly stirring. Keep adding salt until a small amount of
salt lies on the bottom of the beaker. The solution is now saturated with salt. Check and record
the temperature of the solution.
3) Filter the salt solution. This will separate the solution from the undissolved salt. Keep the
filtrate, that is, the salt solution with no undissolved salt.
4) Find the mass of a clean, dry evaporating dish. Record the mass in the data table.
5) Pour the filtrate (salt solution containing no undissolved salt) into the evaporating dish. Find the
mass of the dish and solution. Record the mass in the data table.
6) Fill the beaker part way with water and place on a hot plate. Place the evaporating dish on top of
the beaker. Heat the dish and solution until all the liquid (in the evaporating dish) has
evaporated.
7) After the evaporating dish has cooled, find the mass of the dish and dry residue. Record the
mass in your data table.
Data for Solubility of Salt
Temperature (˚C)
Mass of dish (g)
Mass of dish and solution (g)
Mass of dish and residue (g)
Analysis/Calculations: For each calculation, show the equation you used, show your work, and show your
data with the correct units. This should go on right side (odd # page)
1)
2)
3)
4)
Calculate the
Calculate the
Calculate the
Calculate the
of water.
5) Calculate the
mass of the salt solution that was in the evaporating dish.
mass of the salt residue.
mass of water in the evaporating dish.
grams of salt that dissolved in one gram of water by dividing grams of salt by grams
solubility of NaCl in 100 g of water?
Questions for Discussion: This should go on left side (even # page)
1) Look back at figure 15 on page 414. According to figure 15, what is the solubility of NaCl in 100 g
of water? Calculate your percent error. How close were your results to this accepted value?
2) If you allow a container of sea water to sit in the sun, the liquid level gets lower and lower and
finally crystals appear. What is happening?
Conclusion: This should go on left side (even # page)
1) Restate the purpose
2) Explain (using DATA) how you did or did not meet the purpose
3) Does any of your data not make sense? Explain. What sources of error might account for this?