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No of moles of aspirin = No of mole of NaOH – No of mole of HCl (M x V) NaOH – (M x V) HCl (0.1M x 21.20ml) – (0.04M x 21.80ml) 1.248mmoles Mass of aspirin = 180.157g/mol x 1.248mmoles = 224.8359mg 224.8359mg x 1g/1000mg = 0.2248g of Aspirin Since,
