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Help CHEMISTRY!!!!

A solution of nitric acid, HNO3, of concentration 100 g dm–3, can be used to artificially age wood. A sample of nitric acid, thought to be suitable for this use, was diluted by pipetting 10.00 cm3 of this acid into a 250 cm3 volumetric flask, adding deionised water and making the solution up to the mark. The solution was thoroughly mixed. A titration was carried out using this diluted solution of nitric acid. The burette was filled with 0.0800 mol dm–3 sodium hydroxide solution and 25.00 cm3 of the diluted nitric acid was pipetted into each of three conical flasks. The following results were obtained.

Please show me the method and steps, the mark scheme's not useful! i have a headache
the mean titre is 19.95 by the way
What paper is this?
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binz
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