A ( ) sample of concentrated sulfuric acid was diluted to

CHEMISTRY · Multi-part · A Level · Chemistry · Amount of substance · Amount of substance

Problem

50.00\ \mathrm{cm^3}

(

0.05\ \mathrm{dm^3}

) sample of concentrated sulfuric acid was diluted to

1.00\ \mathrm{dm^3}

, a dilution factor of

20

. A sample of the diluted sulfuric acid was analysed by titration with aqueous sodium hydroxide. In the titration,

25.00\ \mathrm{cm^3}

1.00\ \mathrm{mol\,dm^{-3}}

aqueous sodium hydroxide required

20.00\ \mathrm{cm^3}

of the diluted sulfuric acid for neutralization. Determine the concentration of the original concentrated sulfuric acid solution using the steps below. (1) Construct the equation for the complete neutralization of sulfuric acid by sodium hydroxide. (2) Calculate the amount of sodium hydroxide that was used in the titration. (3) Calculate the concentration of the diluted sulfuric acid. (4) Calculate the concentration of the original concentrated sulfuric acid solution.

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