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Vinegar is a weak acid and will react with an alkali - this is a neutralisation reaction. In this investigation I will be given an alkali called sodium hydroxide. If hydroxide is added to vinegar slowly, or visa versa, I will eventually get a neutral liquid. Problem Do you like vinegar on your bag of fish and chips? Lots of people do, and many chip shops let you help yourself to the vinegar. But are the manufacturers who supply the shops cheating on them? The manufacturers could be adding water, so the chip shops actually get less concentrated vinegar. In this investigation I will get four samples of vinegar (A, B, C and D) from different shops supplied by different manufactures. My job is to carry out a series of tests to see which of the samples from the manufacturer is:- a) The most concentrated, b) The best value for money. Prediction/Hypothesis • I predict the stronger the vinegar the less watered down it is. • I expect the experiments to be quite accurate because I am using measurement tools to measure cm3 of liquid. • I think that all the vinegar is slightly diluted. • I think the strongest vinegar is the one that takes the most amount of alkali to neutralise. Scientific Knowledge A