Abstract In high school chemistry, the most commonly used method of testing chloride ion is to drop silver nitrate solution into the solution. If a white precipitate is formed which is insoluble in dilute nitric acid, the presence of chlorine ion in the solution is indicated. However, in the solubility table, silver sulfate is slightly soluble in water, which is questioned: if the presence of sulfate ion in the solution, will the formation of slightly soluble silver sulfate precipitation, thus interfering with the detection of chloride ion? Through experimental verification, when 0.1 mol/L silver nitrate solution is used, the sulfate ion will not interfere.
