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Name: __________________________________________Date: ____________period____________
Solubility Curve Worksheet
You'll notice that for most substances, solubility increases as temperature increases. As discussed earlier in solutions involving liquids and solids typically more solute can be dissolved at higher temperatures. Can you find any exceptions on the graph?____________________
Here's an example of how to read the graph. Find the curve for KClO 3.
At 30°C approximately 10g of KClO 3 will dissolve in 100g of water. If the temperature is increased to 80°C, approximately ______ of the substance will dissolve in 100g (or 100mL) of water.
Directions: Use the graph to answer the following questions. REMEMBER UNITS!
- What mass of solute will dissolve in 100mL of water at the following temperatures? a. KNO 3 at 70°C = ____________ b. NaCl at 100°C= ____________ c. NH 4 Cl at 90°C= ____________ d. Which of the above three substances is most soluble in water at 15°C. = ____________
2) Types of Solutions
On a solubility curve, the lines indicate the concentration of a __________________ solution - the maximum amount of solute that will dissolve at that specific temperature.
Values on the graph ____________ a curve represent unsaturated solutions - more solute could be dissolved at that temperature.
Label the following solutions as saturated or unsaturated. If unsaturated, write how much more solute can be dissolved in the solution.
Solution Saturated or Unsaturated? If unsaturated: How much more solute can dissolve in the solution? a solution that contains 70g of NaNO 3 at 30°C (in 100 mL H 2 O)
a solution that contains 50g of NH 4 Cl at 50°C (in 100 mL H 2 O)
a solution that contains 20g of KClO 3 at 50°C (in 100 mL H 2 O)
a solution that contains 70g of KI at 0°C (in 100 mL H 2 O)
Use the Solubility Graphs on Page 1
- a. What is the solubility of KCl at 5C? _______ b. What is the solubility of KCl at 25C? _______ c. What is the solubility of Ce 2 (SO 4 ) 3 at 10C? _______ d. What is the solubility of Ce 2 (SO 4 ) 3 at 50C? _______
- a. At 90C, you dissolved 10 g of KCl in 100. g of water. Is this solution saturated or unsaturated?
b. How do you know?
Part II: Graph Questions
- Graph the following data on the graph paper on the next page.
Your graph must:
-Be neat and organized (use a ruler)
-X and Y axis must have proper scale
-Have properly labeled axes
-Use a different color for the two different solubility curves.
Sodium Chloride Solubility
Temperatur e
Solubility (g of solute/100 mL of H 2 0) 0 35. 10 35. 20 35. 30 36 40 36. 60 37. 80 38 90 38. 100 39.
Copper Sulfate Solubility
Temperature Solubility (g of solute/100 mL of H 2 0) 0 23 10 27. 20 32 30 38 40 44. 60 62 80 84 100 114
- Write the data from your lab in the space below:
______22_______grams of sodium chloride dissolved in 100 mL of water _____32________grams of or copper sulfate dissolved in 100 mL of water
Use the graph you just created and the above lab data to answer these questions:
a) Which solution was saturated? Which was unsaturated? Explain.
b) How much more solute could you add to the unsaturated solution?
