Ethane-1,2-dioic acid (oxalic acid) is found naturally in rhubarb. It is a diprotic acid, i.e. it has two acidic hydrogen atoms and has the formula (COOH)2. When it crystalises from aqueous solution the crystals contain water of crystallisation and have the formula (COOH)2.xH2O. This experiment involves making up a standard solution followed by an acid-base titration to find the value of x. It gives practice at using...