Titrations

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Titrations

Using Titrations to Find Concentrations:

Titrations allow you to find out exactly how much acid is needed to neutralise a base or vice versa.

Method:

  • Using a pipette, add 25cm3 alkali to a conical flask along with a few drops of indicator (for alkali, phenolphthalein is good because it makes a drastic change when it is neutral).
  • Next, fill a burette with acid and then add the acid to the base drop by drop.
  • When the solution changes from bright pink to colourless, you should be able to read off the burette exactly how much acid is needed to neutralise the base. 
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Titration Calculations

Working out the Number of Moles:

  • Use ths calculation triangle to work out the number of moles.

Step 1 ---> Work out how many moles of the 'known substance' (in the burette) you have.

  • Moles = concentration x volume

Step 2 ---> Write down the equation and use this to work out how many moles of the 'unknown substance' you have.

Step 3 ---> Work out the comcentration of the 'unknown substance' 

  • Concentration = moles / volume
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