Homework
Quiz next class!
Molarity calculation
Turn in Solution Lab.
Pg 2 #7
Staple all copies
Dilution calculations
together.
Pg 3 #2 and 3
Solubility curves
Pg 4 #1 a-k (we’ll start, finish as HW)
Go over Moles test
• All belongings on a lab table (including phones)
• Nothing to write with!
How Ionic Compounds Dissolve
Will it dissolve?
Solubility Rules for Ionic Compounds
Mainly Water Soluble (will dissolve into ions in water)
All nitrates, acetates, chlorates, & perchlorates.
All ionic compounds containing alkali metal cations (group IA) and ammonium.
All chlorides, bromides, and iodides except mercury, silver, and lead(II).
All sulfates except mercury, silver, lead(II), calcium, barium, and strontium.
Mainly Water Insoluble (will NOT dissolve into ions in water; will remain as a solid
“precipitate”)
All carbonates, phosphates, and sulfites except Group IA and ammonium.
All hydroxides except Group IA, ammonium, calcium, strontium, and barium.
Quiz, Quiz, Trade: Soluble or Insoluble?
Mainly Water Soluble (will dissolve into ions in water)
All nitrates, acetates, chlorates, & perchlorates.
All ionic compounds containing alkali metal cations (group IA) and ammonium.
All chlorides, bromides, and iodides except mercury, silver, and lead(II).
All sulfates except mercury, silver, lead(II), calcium, barium, and strontium.
Mainly Water Insoluble (will NOT dissolve into ions in water; will remain as a solid
“precipitate”)
All carbonates, phosphates, and sulfites except Group IA and ammonium.
All hydroxides except Group IA, ammonium, calcium, strontium, and barium.
Quiz, Quiz, Trade: Soluble or Insoluble?
Try it without the chart!
Solubility: a measure of the amount of solute that
can dissolve in an amount of solvent at a certain
temperature.
The Areas of a Solubility Curve
Usually measured in
g of solute /100 g of solvent
Supersaturated
solution
Saturated solution
Above the line: UNSTABLE! Too much solute;
not enough solvent. Crystals will form.
Under the line: more solute
could dissolve
Unsaturated solution
Supersaturated Solutions are unstable!
Packet Page 4
a) 50 g KCl in 100 g of water at 100°C. ____
b) 50 g KCl in 100 g of water at 60°C. ____
c) 50 g KNO3 in 100 g of water at 60°C. ____
d) 25 g KClO3 in 100 g of water. ____
e) 65 g KNO3 in 50 g of water at 70°C. ____
f) 15 g NH3 in 35 g of water at 20°C. ____
g) 10 g NH3 in 50 g of water at 70°C. ____
h) 25 g ammonium chloride in 30 g of water at
50°C ____
i) 40 g of sodium nitrate in 70 g of water at 20°C.
____
j) 50 g of KCl in 100 g of water at 80°C. ____
k) 40 g potassium nitrate in 25 g of water at
60°C. ____
Solutions Exit Ticket
• Treat it like a quiz
• Everything away except calculator, PT, and
pencil
• Turn over when finished
Homework
Quiz next class!
Molarity calculation
Pg 2 #7
Dilution calculations
Pg 3 #2 and 3
Solubility curves
Pg 4 #1 a-k (we’ll start, finish as HW)