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The principles of acidity and basicity measurement are explained by describing colour‐indicator titration of aqueous solutions. Similar methods are used to determine neutralisation values of non‐aqueous solutions such as petroleum products, although electrometric titration is more suitable for dark‐coloured oils and used oils. The practical importance of neutralisation value tests is discussed, with particular reference to additive oils, turbine oils, gear lubricants and transformer oils.
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1962
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