- #1

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**1. The problem statement, "all variables and given/known data**

A solution of nitric acid, HNO

_{3}, of concentration 100 g dm

^{-3}, can be used to artificially age wood.

A sample of nitric acid was tested by pipetting 10.00 cm

^{3}of the acid into a 250 cm

^{3}volumetric flask and filled up with deionised water to the mark. A titration took place where 19.95 cm

^{3}(mean titre) of sodium hydroxide solution with a concentration of 0.0800 mol dm

^{-3}was added to 25 cm

^{3}

Calculate the concentration of the undiluted nitric acid in g dm

^{-3}

## Homework Equations

M

_{a}V

_{a}= M

_{b}V

_{b}

## The Attempt at a Solution

Using the above equation I got the concentration of the 25 cm

^{3}of nitric acid solution as 0.6384mol dm

^{-3}, which is 40.2192g dm

^{-3}, but how do I find the undiluted concentration?