<Tr> <Td_colspan="2"> Infobox references </Td> </Tr> <Tr> <Td> </Td> <Td> </Td> </Tr> <P> The compound hydrogen chloride has the chemical formula H Cl 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 . </P> <P> Hydrogen chloride is a diatomic molecule, consisting of a hydrogen atom H and a chlorine atom Cl connected by a polar covalent bond . The chlorine atom is much more electronegative than the hydrogen atom, which makes this bond polar . Consequently, the molecule has a large dipole moment with a negative partial charge (δ −) at the chlorine atom and a positive partial charge (δ +) at the hydrogen atom . In part because of its high polarity, HCl is very soluble in water (and in other polar solvents). It is polar covalent instead of Ionic because the differences in hydrogen and chlorines electronegativity is small enough that a complete ionic bond doesn't form . Any electronegativity between . 6 and 1.67 creates a polar covalent bond . </P>

What gas is given off by concentrated hydrochloric acid