Transcript Strong weak and non electrolytes

Weak, Strong and
Nonelectrolytes
Woohoo Chemistry!!!
Agenda
-Attendance
- Hand back all stuff
-Hand out Cheat sheets
-Review: Go over homework questions.
-Solubility chart
-Notes on Weak and Strong electrolytes with
equations.
-Demo with different types of solutions and electricity
-Give Vocabulary Words
-Review Videos Links
-Go over the test
-Question period (including go over some and hand in
your questions that you created)
Review: Homework questions
• Vultures are a type of bird that is able to eat rotting meat
because of extremely strong gastric juices. These gastric juices
are actually aqueous solutions. What is an aqueous solution?
• When too many restaurants open in the same neighborhood,
you may hear people say that the market for restaurants is
saturated. Explain what is meant by this statement and relate it
to saturated solutions.
• What is a saturated solution? Unsaturated solution?
Supersaturated solution?
• What the difference between electrolyte and nonelectrolyte?
• Come up with two different questions that could be asked on
an exam and the answers to those questions
Solubility Chart
• How do I read this thing?
– Negative ion first
– Positive ion second
Electrolytes
• Electrolyte- dissolves in water,
breaks up into ions and conducts
an electric current.
• Nonelectrolyte- dissolves
in water, does not break
up into ions, therefore
not conducting electricity
NaCl Example in water
Vs
Sugar in water
Strong and Weak Electrolytes
• Strong Electrolyte: A substance that is
completely ionized in solution. Ex. Strong
acids, Strong bases and most salts.
• Weak Electrolyte: A substance that only party
ionizes in solution. Example Ethanol and
Chloroform.
Weak and Strong Electrolytes
• H20 (l)

H + (aq) + OH- (aq)
• NaCl (s)  Na+ (aq) + Cl- (aq)
• C12H22O11 (s)

C12H22O11 (aq)
• HCl (l)  H + (aq) + Cl- (aq)
• CH3COOH
• CuSO4

 CH3COO- (aq) + H + (aq)
Cu 2+ (aq) + SO42- (aq)
• NH3 (g) → NH4+ (aq) not going to try this one
Demo
H20 (l) --> H + (aq) + OH- (aq)
NaCl (s) --> Na+ (aq) + Cl- (aq)
C12H22O11 (s)  C12H22O11 (aq)
HCl (l)  H (aq) + Cl (aq)
CH3COOH  CH3COO (aq) + H (aq)
CuSO4  Cu (aq) + SO4 (aq)
H+ + NH3 → NH4+
• Salt (strong), Sugar C12H22O11(non elec),
Copper (II) sulfate (strong), HCl (strong),
ethanol(nonelectrolyte), Acetic acid and
ammonium (weak).
Strong Acids
HCl - hydrochloric acid
HBr - hydrobromic acid
HI - hydroiodic acid (also known as hydriodic acid)
HNO3 - nitric acid
H2SO4 - sulfuric acid
HClO4 - perchloric acid
HClO3- chloric acid
Strong Bases
LiOH
lithium hydroxide
NaOH
sodium hydroxide
KOH
potassium hydroxide
RbOH
rubidium hydroxide
CsOH
cesium hydroxide
Ca(OH)2
calcium hydroxide
Sr(OH)2
strontium hydroxide
Ba(OH)2
barium hydroxide
Vocabulary
mixture / compound
define both terms and list the key differences between a mixture and a compound.
give an example of each
homogeneous / heterogeneous mixtures
solutions are which type of mixture?
Colloids / Suspensions / Solutions / Tyndall effect
aqueous solutions
solute / solvent
define both terms.
Give at least one specific examples of solutions involving: gases dissolved in other gases;
liquids dissolved in other liquids; solids dissolved in liquids. Identify the solute and solvent in
each case
soluble / insoluble
solubility
unsaturated / saturated / supersaturated
how can you prepare a supersatured solution?
electrolyte / nonelectrolyte (or electrolytic solution / nonelectrolytic solution)
What causes the one type of solution to conduct electricity, while the other one does not?
Polar / Nonpolar / Ionic
Define each. What’s the difference between each?
Which solutes will dissolve in which solvents?
Videos
Having trouble with the difference between suspensions
and colloids watch some videos:
• http://www.youtube.com/watch?v=Ti0QroYDta8
Colloids suspension solution
• http://www.youtube.com/watch?v=AlrqitFCNLw
suspension colloid demos
• http://www.youtube.com/watch?v=bn1-Zgcpp_4
Colloids
Strong Weak and Nonelectrolytes Video with demos if
your having trouble:
http://www.youtube.com/watch?v=Pxegf2KKiuc
What's on the exam/ Question Period