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Acid Content in Vinegar (Apparatus (50mL Burette, Retort stand, Clamp, 2x…

- - - - By using 0.1mol/L of Sodium Hydroxide with the diluted vinegar, it provides an accurate proportion/ratio as the diluted vinegar is 10% of the original solution.
      - The equation for the reaction of, CH3COOH + NaOH > H20 + CH3COONa, has a ratio/relationship of 1:1. If the no. of moles of NaOH is known in the titration, the moles of acetic acid in a sample can be found with less difficulty.
    - - When carrying out an acid-base titration, an indicator is used to tell you when the acid and base have mixed in at the right proportions - which results in the "neutralisation". The colour change is often described as the end point.
      - As the reaction between sodium hydroxide and acetic acid is no visible to the naked eye, an indicator is used to determine the equivalence/end point.
      - At the equivalence point, the moles of acetic acid are equal to the moles of sodium hydroxide.
      - Phenolphthalein is a weak acid. When a sufficient amount of sodium hydroxide has been added to the acetic acid, where there is no longer any unreacted acetic acid, the sodium hydroxide will then begin reacting with phenolphthalein. This results in a pink solution.