In common usage, salt often refers to [[sodium]] [[chlorine|chloride]] (NaCl), known as table salt. Salt is used as a seasoning and a preservative. It can be formed by the reaction of [[sodium hydroxide]] (NaOH) and [[hydrochloric acid]] (HCl). | In common usage, salt often refers to [[sodium]] [[chlorine|chloride]] (NaCl), known as table salt. Salt is used as a seasoning and a preservative. It can be formed by the reaction of [[sodium hydroxide]] (NaOH) and [[hydrochloric acid]] (HCl). |