### Primary standard for the standardization of base solutions

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Oxalic acid dihydrate, H2C2O4.2H2O, is often used as a primary standard for the standardization of base solutions. For a procedure comparable to this experiment, approximately how many grams of oxalic acid dihydrate should be used in order to have a volume of about 15ml of NaOH solution (approximately 0.15M) for the tiration? The acid is diprotic (two H+ reacts).

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