Why do you need titrations?
They allow you to find out exactly how much acid is needed to neutralise a quantity of alkali
How to carry out a titration of sodium hydroxide s
1) Use a pipette to measure sodium hydroxide solution
2) Pour it into a conical flask
3) Add a few drops of phenolpthalein
4) Pour hydrochloric acid into a burette. Read the scale
5) Add hydrochloric acid from the burette to the conical flask until the indicator turns colourless. Swirl.
6) Read the scale. Calculate the amount of acid added- gives an idea of how much acid is needed to neutralise the sodium hydroxide
7) Repeat the steps until you have 3 consistent values for the acid volume
What is a mole?
A mole is the quantity of anything that has the same number of particles found in 12.000 grams of carbon-12.
Why is an indicator added? (Phenolpthalein)
Will show a change of colour when the acid and alkali have neutralised one another and the titration is complete.
Why is universal indicator not used?
It produces a range of colours