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Titration - PowerPoint PPT Presentation

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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PowerPoint Slideshow about ' Titration' - marja

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Presentation Transcript

Titration

• 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

• 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

• 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

• 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

• 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?