Hello, I understand that this question may seem rather obvious for some. Nonetheless, it is something that seems to have thrown me off a number of times. When writing chemical equations involving acidic or basic solutions, I know that the acid on the reactant side is written with the state (aq). i.e. HCl (aq) + H2O (l) → H3O+(aq) + Cl-(aq) However, if it is a gas that forms an acid upon contact with water, is the acid on the reactant side still written with the state (aq), or is it written with the state (g)? For example, let's say a question states "HCl (g) is dissolved in water to form an acidic solution..." What state would the hydrogen chloride gas be written as within the equation? Ideas are welcome, explanations are greatly appreciated. :) Thank you, Eric.