In the manufacture of nitric acid, pure dry sodium nitrate is treated with 95% (weight) sulphuric acid. 2NaNO3 + H₂SO4 → 2HNO3 + Na₂SO4 Acid is supplied in excess to ensure that the resulting nitre cake is liquid containing 35% sulphuric acid by weight. The cake contains 1.5% water by weight. In addition 2% of the nitric acid formed will remain with the cake. For a basis of 100 kg of sodium nitrate treated, calculate the following: (a) The weight and composition of the nitre cake (b) The weight of sulphuric acid to be used

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