In a titration, sulfuric acid of concentration \(0.1 moll^{-1}\) was added from a burette into a conical flask containing \(20cm^{3}\) of sodium hydroxide solution. The average titre was \(11.2cm ...

and the true ascorbic acid content is obtained either by subtracting this figure from the original titration value or by determining the renewed titration value obtained on diluting with water.