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Titration. Definition. Process used to determine the strength of an unknown acid or base Can determine the unknown acid by adding to it a base of known strength until it is neutralized Will know when it is neutral by using an indicator. Indicators. pH sensitive dye. Transition Interval.

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Presentation Transcript
definition
Definition
  • Process used to determine the strength of an unknown acid or base
  • Can determine the unknown acid by adding to it a base of known strength until it is neutralized
  • Will know when it is neutral by using an indicator
indicators

Indicators

pH sensitive dye

transition interval
Transition Interval
  • Range over which an indicator changes color
  • Some change at pH’s of around 7

- great for showing neutralization

  • Some change at pH’s lower than 7

- show strong acids

  • Some change at pH’s higher than 7

- show strong bases

equivalence point
Equivalence Point
  • Point at which the solutions are present in equal amounts
  • See the equivalence point with indicators
  • If the acid and base are both strong, the equivalence pt is at a pH of 7
  • If the acid is strong and the base is weak, the equivalence pt is lower than 7 pH
  • If the acid is weak and the base is strong, the equivalence pt is higher than 7 pH
problem
Problem
  • If you have .05L of HCl at an unknown concentration and you add to it .025L of a .10M NaOH base, an indicator shows that it has reached neutralization. What is the molarity of the acid?
  • Step 1: Find the moles of the known
  • Step 2: Write the balanced equation
  • Step 3: Use mole ratio to find moles of the unknown
  • Step 4: Determine M of unknown
practice
Practice
  • In a titration, 27.4ml of 0.0154M Ba(OH)2 is added to a 20.0ml sample of HCl solution of unknown concentration. What is the molarity of the acid solution?
  • By titration, 17.6mL of H2SO4 neutralized 27.4mL of LiOH solution. What is the molarity of the acid?
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