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Titration

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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Presentation Transcript

  1. Titration

  2. 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

  3. Indicators pH sensitive dye

  4. 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

  5. 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

  6. 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

  7. 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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