NAME:
MODS:
PART 1: Use the solubility graph you just made to answer the following questions:
1.
How does the solubility change (increase/decrease) over the temperature range for KCl, LiCl and NH 4Cl?
2.
How does the solubility change (increase/decrease) for HCl? Why do you think it is different?
 Hint: think types of compounds!!!
3.
What mass of each of the chlorides will dissolve in 100 g of water at 50ºC? (What are their solubilities?)
a)
KCl
________________
b)
LiCl
________________
c)
NH4Cl ________________
d)
HCl
________________
4.
At what temperature will the same amount of HCl and KCl dissolve in 100 g of water?
5.
All along the curve for each compound represents the amount of chloride to be dissolved in 100 g of water to
make a saturated solution. At any given temperature, the amount of chloride dissolved below the curve
represents an unsaturated solution while the amount of chloride dissolved above the curve represents
supersaturated.
If you dissolve 55 g of each chloride in 100 g of water at 60ºC, would the resulting solution be saturated,
unsaturated, or supersaturated?
a)
KCl
______________________ b)
LiCl
_____________________
c)
NH4Cl ______________________ d)
HCl
_____________________
6.
If you made a supersaturated solution of KCl at 80ºC with 70 g of KCl and a seed crystal was added to it,
some of the KCl would precipitate out – how much? Hint: it will go back to being saturated, on the line!
7.
The graph you made is set at 100 g of water to dissolve the chlorides. Since solubility is a physical
property of matter, the amount of solute dissolved in other amounts of water can easily be found using a
proportion! Try it!
a)
If you want to make 50
g of a saturated solution of HCl at 20ºC, how much HCl would you use?
b)
If you want to make 250
g of a saturated solution of KCl at 20ºC, how much KCl would you use?
PART 2: Use the solubility graph below to answer the following questions:
1.
Which compound is least soluble at 10ºC?
2.
Which compound is most soluble at 10ºC?
3.
What is the solubility of the following compounds
at 50ºC? (How much can dissolve in 100 g H2O?)
4.
a)
NaNO3 ______________________
b)
KNO3 ______________________
c)
NH4Cl ______________________
d)
SO2
______________________
If you dissolve 80
g of each of the following salts
in 100 g of water at 10ºC, would the solution be
saturated, unsaturated or supersaturated?
a)
KClO3 _________________________
b)
KI
c)
NaNO3 _________________________
_________________________
5.
If you made a super saturated solution of NaNO3 at 40ºC with 130
added to it, some of the NaNO3 would precipitate out – how much?
Hint: it will go back to being saturated, on the line!
g of NaNO3 and a seed crystal was
6.
If you want to make 400
Hint: use a proportion!
7.
If you want to make 150
Hint: use a proportion!
8.
The graph above shows both ionic compounds (salts) and molecular compounds (usually gases). By just
looking at the graph, which 3 compounds do you suppose are in the gaseous state?
g of a saturated solution of NH4Cl at 50ºC, how much NH4Cl would you use?
g of a saturated solution of NaNO3 at 10ºC, how much NaNO3 would you use?