Laboratory preparation of HCL
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Yogita Ingle 5 years, 7 months ago
We produce Hydrogen Chloride in the laboratory by treating sodium chloride with concentrated sulphuric acid. We, then, heat this mixture up to 420K.
420K
NaCl + H2SO4 → NaHSO4 + HCl
We get Sodium bisulphate as a by-product. This is insoluble. Therefore, we further mix it with more sodium chloride. This mixture has to be further warmed to a higher temperature of around 823K. It gives dissolvable sodium sulfate and HCl gas.
823K
NaHSO4 + NaCl → Na2SO4 + HCl
We dry this HCl by treating it with concentrated sulphuric acid. HCl is not dried over phosphorus pentoxide or brisk lime. This is because it reacts with both of these compounds.
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