Titration
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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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Titration

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Titration

Titration


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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