Who's been cheating on the vinegar?

Aim:
To investigate if the vinegars have been diluted by working out their concentrations.

Scientific Background:
Vinegar is an acid and there fore can be neutralised by an alkali.

Acid + Alkali à salt + water

Hydrochloric acid + Sodium Hydroxide à Sodium chloride + water

Vinegar is a weak acid and therefore it only partially ionises in solution.

CH3COOH ßà CH3COO- + H+

An alkali such as Sodium Hydroxide has a formula NaOH. If the alkali is strong then it ionises fully in solution.

NaOH ßà Na+ + OH-

When the acid H+ reacts with the alkali OH- the solution neutralises.

Prediction:
If the acid has been diluted there will be less H+ ions present in the volume used. Therefore to cancel the alkali more acid will be required. This is on the assumption that the alkali volume and concentration stay constant.

Method:
· Measure 10cm3 of 0.1m alkali into a measuring cylinder then place the solution into......

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Title: Vinegar
Approximate Word Count: 987
Approximate Pages: 4 (250 words per double-spaced page)

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