Question

what is diference between hcl gas and hcl acid

Answer 1

HCL gas is molecular HCL in gaseous phase, HCL acid is HCL in solution with water, and can be said to be in the form H⁺Cl⁻. It is the dissociation of the molecule into constituent ions, which gives an acid its properties. On a physical level, HCL gas is a yellow/green gas and HCL acid is a clear solution.