Titration What is It? Acid and base combined together Graph of pH as a function of volume of titrant is called a titration curve.

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Presentation transcript:

Titration

What is It? Acid and base combined together Graph of pH as a function of volume of titrant is called a titration curve

Strong Acid/Strong Base Titration Curve

pH at the equivalence point in any titration is the pH of its resultant salt At equivalence point there is the same amount of acid and base No buffering occurs in strong acid and base titration What would curve for a strong base titrated by a strong acid look like?

Example Calculate the pH when 49.00ml of.100M NaOH is added to 50.00ml of.100M HCl.

Example How many ml of.50 M NaOH are required to reach the equivalence point by titrating 50.0 ml of.40M HBr?

Weak Acid/Strong Base pH starts higher Rapid rise and then levels into a zone where pH doesn’t change much (buffering zone) When enough base added to neutralize ½ acid – called half equivalence pt. (middle of buffer zone and pH = pK a ) pH at equivalence pt is greater than 7

Example Calculate the pH in the titration of acetic acid by NaOH after 30.0ml of.100M NaOH is added to 50.0ml of.100M acetic acid.

Example Draw and label a titration curve for a weak base titrated with a strong acid. Show the equivalence point, buffering zone, where pH = pK.

Polyprotic Acid Curves