Analyse the samples by titration and to decide which of the samples, if any have been watered down.

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Titration

Plan

The Aim

        A trading standards officer suspects that a wholesaler is supplying fish and chip shops with vinegar that has been watered down. The officer has collected several samples of the vinegar from different shops, together with a sample of the same brand of vinegar direct from the manufacturer. My task in this assignment is to analyse the samples by titration and to decide which of the samples, if any have been watered down. I will then prepare a report for the officer showing the extent to which the vinegar samples have been watered down if at all. I was given the manufacturers sample and three other samples to test.

The Variables

        The possible input variables are the concentration of the vinegar, the concentration of sodium hydroxide, the amount of vinegar, amount of sodium hydroxide, the amount of phenolphthalein (indicator) and the temperature. My possible outcome variables are the amount of vinegar needed to neutralize the sodium hydroxide and the speed of the reaction.

        The input variable I have decided to change is the concentration of the vinegar and the output variable I have decided to measure is the amount of vinegar needed to neutralize the sodium hydroxide. My control variables that I will keep the same to make my experiment fair are the amount and concentration of sodium hydroxide, the starting amount of vinegar, the amount of phenolphthalein and the same equipment.

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Prediction

        My prediction is ‘The higher the concentration of vinegar the less vinegar needed to neutralize the solution of vinegar and sodium hydroxide’ because if the vinegar has a low concentration then it contains a smaller number of moles per litre. So therefore more of the vinegar would be needed to neutralize the sodium hydroxide. If the vinegar was of a higher concentration less of it would be needed to neutralize the sodium hydroxide.

Equipment List

Burette

Pipette

Pipette filler

Conical flask

Beakers x2

Funnel

Clamp stand

White tile

Phenolphthalein indicator

Sodium hydroxide

Vinegar samples: manufacturers, ...

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