Titration practical

find the concentration of an unknown solution

• use a pipette to transfer 25cm3 of sodium hydroxide solution into a conical flask • Add 5 drops of an indicator such as methyl orange to the alkali in the conical flask • place the conical flask on a white tile • Film a burette with sulfuric acid • Slowly add the acid to the alkali until the solution is netral - once we start to see a colour change, add the acid drop by drop until the solution is neutral - swirl the mixture • Read the volume of acid added from the burette • Repeat the titration until you get two readings within 0.1cm3 • take a mean of these for our final volume

to reduce the risk of splashing

to draw liquid into the pipette, to allow the liquid to drain out of the pipette, as blowing the liquid out will give you an incorrect volume

so that we can see the colour change more easily

to make sure the acid and alkali mix

the bottom of the miniscus (curve)

• conc = mol/volume • conc = mass /volume

divide by 1000