Sparky! What is an electrolyte?

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Presentation transcript:

Sparky! What is an electrolyte? http://www.chem.ufl.edu/~itl/4411/react/dissolution_of_cmpds.swf Sparky!

What is happening? http://antoine.frostburg.edu/chem/senese/101/kits/conductivitysimulation3.html Take another look at ionic solutions, what is the difference?

Which substances are electrolytes? Salts: A salt is a substance produced by the chemical bonding of metal and non-metal ions. These ions are usually not H+ or OH- (an ionic molecule) H2O NaCl (s)  Na+ (aq) + Cl- (aq) Solid In aqueous solution

Which substances are electrolytes? Acids: A substance that releases H+ ions in solution. HCl(l)  H+ (aq) + Cl- (aq) H2O Liquid

Which substances are electrolytes? Bases: A substance that releases OH- (an ionic molecule) in solution. NaOH(s)  Na+ (aq) + OH- (aq)

What are some exceptions that are hard to figure out: Vinegar (acetic acid): CH3COOH  CH3COO- + H+ Ammnonia (NH3) a base: NH3 + H2O  NH4+ + OH-

Sugar Sugar is not an electrolyte because it does not produce ions in solution. C12H22O11 (s)  C12H22O11 (aq) http://www.chem.ufl.edu/~itl/4411/react/dissolution_of_cmpds.swf

Fruit Batteries! http://www.youtube.com/watch?v=CAL5xH2TZGg

What is happening? http://antoine.frostburg.edu/chem/senese/101/kits/conductivitysimulation3.html Take another look at ionic solutions, what is the difference? Come up with your own explanation!

An electrolyte is… a substance that, when dissolved in water, allows an electric current to flow through the solution.

We can measure the strength of an electrolyte by… Measuring the electrical conductivity of the solution.

pH and the pH Scale

The following slides are not in your notes, use the back page of the package to write this information down.

Sugars and other covalent bonds are not electrolytes.

Strong Acid Weak Acid What is the difference? Only some of the molecules dissociate, while many remain intact. Complete electrolytic dissociation into ions.

Try some questions Questions in your package. Textbook p. 64 # 27- 33