Titrations

• What is titration?


  Titration is the slow addition of one solution of a known concentration (called a titrant) to a known volume of another solution of unknown concentration until the reaction reaches neutralization, which is often indicated by a color change
• 4 apparatus required for titration

  burette, conical flask, safety pipette filler and pipette

  
• What will show a change of color when the titration is completed?

  A few drops of INDICATOR

  
• What is the conical flask used for?

  the conical flask contains the solution tested (and the indicator)

  
• What is the safety pipette filler used for?

  used to draw solution into the pipette.

  This is emptied into a conical flask.

  
• Steps of titration


  1. if solid, WEIGHED, dissolved to MAKE A SOLUTION. (usually 100cm)

  2. A PIPETTE is used to MEASURE ACCURATELY a volume of this solution. This is then emptied into a conical flask

  3. A few drops of an INDICATOR may be added to the conical flask. This will show a change of color when the titration is complete.

  4. A second chemical is placed in a burette. Often the SOLUTION IN THE BURETTE is an acid or alkali, and it must be of a precise, known concentration.

  5. The solution FROM the burette is run INTO the conical flask.

  6. Eventually, a COLOUR CHANGE shows that the correct amount has been added to react completely
• In a titration, what apparatus is used to measure the sample solution into a conical flask?

  Pipette
• In a titration, what apparatus is used to add the second chemical to the sample solution in a conical flask?

  Burette
• What chemical may be added to the sample solution to give a color change at the end point?

  Indicator
• What ions does all acid contains?

  Hydrogen ions, H+
• What ions does all alkalis contains?

  Hydroxide ions, OH-
• What is the name of the process that neutralizes acids?

  Titration
• What is the name of the solution in the burette?

  Titrant
• use of titration in real life?

  When studying food, titration helps identify fat and water content and the presence of vitamins.
• What is the burette used for?

  Is Acid of alkali solutions, and it must be of a precise, known concentration.

  It measures different volumes and let you and a solution drop by drop.

  
• What is the pipette used for?

  To measure accurately a volume of the solution tested.

  
• To find amount of volume in burette used.

  End volume - initial volume

  
• Reading burette

  
• The titration results can then be used to calculate the amount of the synthesised chemical in the sample, and therefore find its purity.
• Phenolphthalein is

  Colourless in acid → pink in alkali.
• Titration is a technique that measures the volumes of acid and alkali solutions needed in a

  Neutralisation reaction