Submitted by: Submitted by rbswas
Views: 10
Words: 2363
Pages: 10
Category: Literature
Date Submitted: 06/16/2016 11:32 AM
Acids, Bases and Salts
Acids and Bases
Acid A substance which ionizes to form H+ (H+ is a product).
Examples
HNO3(aq) H+(aq) + NO3-(aq)
HCl(aq) H+(aq) + Cl-(aq)
Base A substance that accepts (reacts with) H+.
Examples
OH-(aq) + H+(aq) H2O(l)
NH3(aq) + H+(aq) NH4+(aq)
Note that to obtain hydroxide ions (OH-) we start with an ionic compound that dissolves in water to form hydroxide ions, such as the alkali metal hydroxides, LiOH, NaOH, KOH, RbOH, etc.
Since both acids and bases dissolve in water to form ions, they are both electrolytes. However, most acids and bases do not completely dissociate to form ions, those that do are called strong acids or strong bases.
Strong acid/base Completely ionizes in solution
Strong acid/base Strong electrolyte
Weak acid/base Partially ionizes in solution
Weak acid/base Weak electrolyte
The list of strong acids and bases is given in your book in table 4.1 and below. You will be expected to memorize this list.
Strong Acids
Perchloric acid
HClO4
Chloric acid
HClO3
Hydrochloric acid
HCl
Hydrobromic acid
HBr
Hydroiodic acid
HI
Nitric acid
HNO3
Sulfuric acid
H2SO4
Strong Bases
Group 1A metal hydroxides
LiOH, NaOH, KOH, RbOH, CsOH
Heavy group 2A metal hydroxides
Ca(OH)2, Sr(OH)2, Ba(OH)2
Unless told otherwise we will assume that all other acids and bases are weak.
How can I recognize an acid?
We expect an acid when hydrogen combines with either a non-metal or a polyatomic anion.
Examples
H2S, H3PO4, HF, HCl, HClO, HC2H3O2 etc.
How can I recognize a base?
At the moment we will only concern ourselves with two types of bases:
ionic compounds where hydroxide is the anion
ammonia (NH3)
Examples
KOH, LiOH, NH3, Ca(OH)2, NH4OH, etc.
Neutralization Reactions and Salts
Neutralization Reaction A reaction between an acid and a base.
If the base is a metal hydroxide then one of the products is water...