The successive reactions in the manufacture of HCI from salt and sulfuric acid may be represented by the following equations: NaCl + H2SO4 = NaHSO4 + HCI NaCI + NaHSO4 = Na2SO4 + HCl In practice the salt is treated with aqueous sulfuric acid containing 75% H2SO4 in slight excess of the quantity required to combine with all the salt to form Na2SO4. Although the first reaction proceeds readily, strong heating is required for the second. In both steps, the process HCl and water vapor are evolved from the reaction mass. "Salt Cake" prepared by such a process was found to have the following composition: 91.48% Na2SO4, 4.79% NaHSO4, 1.98% NaCl, 1.35% H2O and 0.4% HCl. The salt used in the process is dry and may be assumed to be pure NaCl. On a basis of 1000 kg of salt charged. Calculate: (a) weight of acid added, weight of salt cake formed and weight of each gas driven off (b) % conversion of NaCl in the first reaction and the degree of completion of the second reaction.
The successive reactions in the manufacture of HCI from salt and sulfuric acid may be represented by the following equations:
NaCl + H2SO4 = NaHSO4 + HCI
NaCI + NaHSO4 = Na2SO4 + HCl
In practice the salt is treated with aqueous sulfuric acid containing 75% H2SO4 in slight excess of the quantity required to combine with all the salt to form Na2SO4. Although the first reaction proceeds readily, strong heating is required for the second. In both steps, the process HCl and water vapor are evolved from the reaction mass. "Salt Cake" prepared by such a process was found to have the following composition: 91.48% Na2SO4, 4.79% NaHSO4, 1.98% NaCl, 1.35% H2O and 0.4% HCl. The salt used in the process is dry and may be assumed to be pure NaCl. On a basis of 1000 kg of salt charged.
Calculate:
(a) weight of acid added, weight of salt cake formed and weight of each gas driven off
(b) % conversion of NaCl in the first reaction and the degree of completion of the second reaction.
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