preparation of hcl gas
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The compound hydrogen chloride has the chemical formula HCl and as such is a hydrogen halide. At room temperature, it is a colorless gas, which forms white fumes of hydrochloric acid upon contact with atmospheric water vapor. Hydrogen chloride gas and hydrochloric acid are important in technology and industry. Hydrochloric acid, the aqueous solution of hydrogen chloride, is also commonly given the formula HCl.
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LABORATORY PREPARATION -
NaCL + H2SO4 ----> NaHSO4 + HCL
«» temperature : below 200°C
temperature above 200°C-
1) produces Na2SO4 which form a hard crust and is difficult to remove
2) the glass tends to crack at such high temperature.
«» collection method : upward displacement of air
reason :
1) HCL gas is highly soluble in water so not collected over water
2) HCL is heavier than air .
NaCL + H2SO4 ----> NaHSO4 + HCL
«» temperature : below 200°C
temperature above 200°C-
1) produces Na2SO4 which form a hard crust and is difficult to remove
2) the glass tends to crack at such high temperature.
«» collection method : upward displacement of air
reason :
1) HCL gas is highly soluble in water so not collected over water
2) HCL is heavier than air .
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