Cl - + H 2 SO 4 → HCl + HSO Gas so produced (1) Turns blue litmus paper red (2) Gives white fumes of NH 4 Cl when a glass rod moistened with ammonia solution is brought near the mouth of test tube. ii) Silver nitrate solution: White, curdy ppt. of AgCl insoluble in water & in dil .nitric acid, but soluble in dilute ammonia solution. Litmus Test Ferric chloride test Liebermann’s test Litmus Test: A drop of the given liquid or a crystal (if solid) is placed on a moist blue litmus paper . If the colour changes to red, phenolic group may be present. Neutral Ferric Chloride Test: If the compound is sparingly soluble in water a hot saturated aqueous solution is prepare and ... Acids turn blue litmus red. Bases or alkalis turn red litmus blue. Neutral solutions don’t change the colour of either red litmus paper or blue litmus paper . A blue litmus paper was first dipped in dilute HCl and then in dilute NaOH solution. It was observed that the colour of litmus paper_______ A.Changes to red B.
