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Acids and Bases

Topic Review on "Title":

Acids and bases are used throughout chemistry.

Definitions of acids and bases
There are three common definitions of acids and bases:

  • Arrhenius acid: Produces hydronium ion in water.
  • Arrhenius base: Produces hydroxide ion in water.
  • Brønsted-Lowry acid: Donates a proton (H+1)
  • Brønsted-Lowry base: Accepts a proton
  • Lewis acid: Accepts electrons
  • Lewis base: Donates electrons

Strong acids and bases are ones in which most molecules perform their “duty” while weak acids and bases only have a few acid and base molecules that act as acids and bases.  There are only a few strong acids and bases to remember—the rest will most likely be weak.  Strong acids: HCl, HBr, HI, HNO3, HClO3, HClO4.  Strong bases: NaOH, KOH, Ca(OH)2, Ba(OH)2, Sr(OH)2

A conjugate acid is what remains after a base does its “job”.  A conjugate base is what’s left after an acid does it’s “job.”  Strong acids or bases form a weak conjugate and vice versa.

The pH scale is a logarithmic scale to measure the acidity of a solution.    Strong acids and bases can be assumed to dissociate completely.  Therefore, the concentration of the original strong acid or base is assumed to equal the concentration of the hydrogen or hydroxide ion.  For weak acids or bases, the equilibrium constant and ICE charts are used to determine the concentration of the hydronium ion before solving for pH.

Acid/base properties of salts
Some salts can have acid/base properties based on the acid or base they are based off of. 
Salts from

  • Weak acid + strong base = Basic
  • Weak acid + weak base = Neutral
  • Strong acid + weak base = Acidic
  • Strong acid + Strong base = Neutral

A buffer is a solution containing a weak acid and its conjugate base or a weak base and its conjugate acid.  Buffers resist changes in pH when acids or bases are added.  The pH will still change, but much less than if it was plain water. 

Titrations are used to find the concentration of an unknown solution using a solution of known concentration.  An indicator is used that changes color at the stoichiometric point (the point at which no reactants are left over) based on the pH of the products that are in solution at that point.  Stoichiometry is used at that point to determine the unknown concentration.

Rapid Study Kit for "Title":
Flash Movie Flash Game Flash Card
Core Concept Tutorial Problem Solving Drill Review Cheat Sheet

"Title" Tutorial Summary :

Many reactions in chemistry involve acids and bases.  This tutorial will introduce the three definitions for acids and bases, as well as discussing the concept of strong versus weak acids and bases, along with the acid or base properties of the salts produced.  The pH scale and pH calculations will be introduced, along with buffers and titrations.

Tutorial Features:

Specific Tutorial Features:

Molecular animations of acid-base reactions

Series Features:

  • Concept map showing inter-connections of new concepts in this tutorial and those previously introduced.
  • Definition slides introduce terms as they are needed.
  • Visual representation of concepts
  • Animated examples—worked out step by step
  • A concise summary is given at the conclusion of the tutorial.

"Title" Topic List:
  • Acids and base definitions
    • Arrhenius
    • Bronsted-Lowry
    • Lewis
  • Properties of acids and bases
  • Strong versus weak acids and bases
  • Conjugates of acids and bases
  • pH scale
  • Acid and base properties of salts
  • Buffers
  • Titrations

See all 24 lessons in college chemistry, including concept tutorials, problem drills and cheat sheets:
Learn Yourself to Teach Chemistry Visually in 24 Hours

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