The chemical formula for potassium chloride is KCl, where K is the symbol for potassium (from its Latin name 'Kalium') and Cl is the symbol for chlorine. The question contains a spelling error ('Pottasium' instead of 'Potassium') but the formula KCl is correct. The other options are different compounds: HCl is hydrochloric acid, KOH is potassium hydroxide, and KI is potassium iodide.