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  4. Sulphuric acid and orthophosphoric acid have the same molecular mass. Ratio of the masses of these acids needed to neutralise the same amount of an alkali if the sulphate and dihydrogen orthophosphate were formed is

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Q. Sulphuric acid and orthophosphoric acid have the same molecular mass. Ratio of the masses of these acids needed to neutralise the same amount of an alkali if the sulphate and dihydrogen orthophosphate were formed is

Some Basic Concepts of Chemistry

Solution:

$H_{2}SO_{4}+2OH^{-} \to SO^{2-}_{4}+2H_{2}O$
$H_{3}PO_{4}+OH^{-} \to H_{2}PO^{-}_{4}+H_{2}O$
For same amount of alkali, $H_{2}SO_{4}$ and $H_{3}PO_{4}$
required are in the ratio $1 :2$ (by number of moles or by weight)