What information does a solubility curve provide?
Solubility curve provides us information about how many gram of salt can be dissolved in water at different temperature
Part 2: Graphing Solubility Curves
Create a graph of solubility versus temperature, using the data in Table 1.
Solubility of Common inorganic compounds
(grams solute per 100 mL of water)
|
Compound
|
Temperature (oC)
|
0oC
|
10oC
|
20oC
|
30oC
|
40oC
|
50oC
|
KI, potassium iodide
|
127.5
|
136
|
144
|
152
|
160
|
168
|
KCl, potassium chloride
|
27.6
|
31.0
|
34.0
|
37.0
|
40.0
|
42.6
|
NaCl, sodium chloride
|
35.7
|
35.8
|
36.0
|
36.3
|
36.6
|
37.0
|
NaHCO3
, sodium bicarbonate
|
6.9
|
8.15
|
9.6
|
11.1
|
12.7
|
14.45
|
NaOH, sodium hydroxide
|
-----------
|
-----------
|
109
|
119
|
145
|
174
|
MgSO4• 7 H2O, epsom salts
(magnesium sulfate heptahydrate)
|
------------
|
23.6
|
26.2
|
29
|
31.3
|
-------------
|
Use the Create A Graph website (http://nces.ed.gov/nceskids/createagraph/) to make your graph or use graph paper and colored pencils and make a photo of your graph. Choose appropriate scales, label the axes, include a title, and draw the best-fit line for each compound's solubility data. Include a legend that indicates the color code you used. Paste your completed graph (or a picture of it) into this document.
Part 3: Interpreting Solubility Curves
Using the graph below to answer the following questions:
The solubility of _____________ is least affected by temperature. (name of substance)
The solubility of _____________ is most affected by temperature. (name of substance)
When 50 grams of potassium chloride, KCl, is completely dissolved in 100 grams of water at 50 ºC, the solution can be correctly described as saturated/unsaturated/supersaturated. (highlight the correct choice)
A solution of potassium chlorate, KClO3, has 20 grams of the salt dissolved in 100 grams of water at 70 ºC. Approximately how many more grams of the salt can be added to the solution before reaching the saturation point?
When 30 grams of potassium nitrate, KNO3, is dissolved in 100 grams of water at 20 ºC, the solution can be correctly described as:saturated/unsaturated/supersaturated (highlight the correct choice)
When 20 grams of potassium chlorate, KClO3, is dissolved in 100 grams of water at 80 ºC, the solution can be correctly described as saturated/unsaturated/supersaturated
At 80
oC, a solution made up of 45 grams NH4Cl dissolved in 100 grams H2O would be considered (saturated, unsaturated, supersaturated).
At approximately what temperature does the solubility of sodium chloride, NaCl, match the solubility of potassium dichromate, K2Cr2O7?
How many grams of sodium nitrate, NaNO3, are soluble in 100 g of water at 10 ºC?
At 50
oC, which substance produces the most concentrated solution? the most dilute solution? Explain.
At 60
oC, which solution is more concentrated—a saturated solution of NH3
or a saturated solution of KClO3? Explain.
A beaker containing 80 grams of lead(II) nitrate, Pb(NO3)2, in 100 grams of water has a temperature of 30 ºC. Approximately how many grams of the salt are undissolved, on the bottom of the beaker (assume the solution is saturated)?
A student dissolves 15 grams NaCl in 100 grams water at 20
oC. How much more salt must be added to make the solution saturated?