Chapter 15.1

• What is the Common ion effect?

  The shift in an equilibrium position caused by the addition or presence of an ion involved in the equilibrium reaction.
• What is the Stoichiometric point?

  The point in a titration when enough titrant has been added to reach exactly with the substance in solution being titrated.
• What is pH curve (titration curve)?

  A plot showing the pH of a solution being analyzed as a function of the amount of titrant added.
• Acid - base indicator : A substance that marks the end point of an acid-base titration by changing color.
• Stoichiometric point, or equivalence point: The point in a titration when enough titrant has been added to react exactly with the substance in solution being titrated.
• pH curve or titration curve: A plot showing the pH of a solution being analyzed as a function of the amount of titrant added.
• What is buffering capacity?

  The ability of a buffered solution to absorb protons or hydroxide ions without a significant change in pH; determined by the magnitudes of [HA] and [A-] in the solution.
• What is the Henderson-Hasselbalch equation: An equation giving the relationship between the pH of an acid-base system and the concentrations of a base and acid: pH=pKa+log([base][acid])
• Buffering solution: A solution that resists a change in its pH when either hydroxide ions or protons are added.