Science Assignment on Vinegar Titration
Science Assignment
1.1 Introduction
Vinegar was discovered around 5000 BC and it is documented to have been used by Hippocrates who has used vinegar as a medicine for wounds. Vinegar has many uses, although the main use for vinegar has been for treatment of wounds. It is also been commonly used as a cleaning agent throughout the years, even to this day. Vinegar is often used in cooking, especially salads. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1785201/ Neutralisation (in science) is to turn an acidic solution neutral by adding a base to it or the other way round (base solution to become neutral by adding an acid to it) http://science.yourdictionary.com/neutralize In this experiment, a base is added to three different types of acids (a,b,c) to try and get them to the closest endpoint (a very pale pink) and record the amount of base used in millimetres, looking for consistency in the amount of base used. The reason for three tests for each acid is to get the most accurate amount of base, to neutralise the acid.
1.2 Aim
To determine the concentration of acetic acid in some commercial vinegars by titration against a standard sodium hydroxide solution.
1.3 Hypotheses
It is hypothesised that as the volume of vinegar is increased, the amount of sodium Hydroxide required will neutralise will the acid to change it to a pale pink.
Method
2.1 Materials * Diluted vinegar solutions (labeled ‘A’, ‘B’, & ‘C’) * Standardized 0.1M NaOH solution * 10 mL pipette * Phenolphthalein indicator, * Retort stand and burette clamp * Small funnel * 100 mL beaker * 150 mL conical flask, * Wash bottle * Pipette filler
2.2 Variables
Independent (volume of vinegar)
Dependent (volume of sodium hydroxide)
Controlled (Indicator base plus volume of indicator and base)
2.3 Procedure * You will transfer 10ml aliquot of your diluted vinegar into a conical flask. * Add 3 drops of the phenolphthalein indicator and then
1.1 Introduction
Vinegar was discovered around 5000 BC and it is documented to have been used by Hippocrates who has used vinegar as a medicine for wounds. Vinegar has many uses, although the main use for vinegar has been for treatment of wounds. It is also been commonly used as a cleaning agent throughout the years, even to this day. Vinegar is often used in cooking, especially salads. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1785201/ Neutralisation (in science) is to turn an acidic solution neutral by adding a base to it or the other way round (base solution to become neutral by adding an acid to it) http://science.yourdictionary.com/neutralize In this experiment, a base is added to three different types of acids (a,b,c) to try and get them to the closest endpoint (a very pale pink) and record the amount of base used in millimetres, looking for consistency in the amount of base used. The reason for three tests for each acid is to get the most accurate amount of base, to neutralise the acid.
1.2 Aim
To determine the concentration of acetic acid in some commercial vinegars by titration against a standard sodium hydroxide solution.
1.3 Hypotheses
It is hypothesised that as the volume of vinegar is increased, the amount of sodium Hydroxide required will neutralise will the acid to change it to a pale pink.
Method
2.1 Materials * Diluted vinegar solutions (labeled ‘A’, ‘B’, & ‘C’) * Standardized 0.1M NaOH solution * 10 mL pipette * Phenolphthalein indicator, * Retort stand and burette clamp * Small funnel * 100 mL beaker * 150 mL conical flask, * Wash bottle * Pipette filler
2.2 Variables
Independent (volume of vinegar)
Dependent (volume of sodium hydroxide)
Controlled (Indicator base plus volume of indicator and base)
2.3 Procedure * You will transfer 10ml aliquot of your diluted vinegar into a conical flask. * Add 3 drops of the phenolphthalein indicator and then