Titrations

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  • Created by: Lina
  • Created on: 06-04-14 19:06

Why do you need titrations?

They allow you to find out exactly how much acid is needed to neutralise a quantity of alkali

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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

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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.

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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.

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Why is universal indicator not used?

It produces a range of colours 

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