How will the presence or absence of the NH4+ ion be detected

Last updated: 8/4/2022

How will the presence or absence of the NH4+ ion be detected in fertilizer? Add hydrochloric acid (HCI) and look for a color change with red litmus paper. Add hydrochloric acid (HCI), followed by BaCl₂ and look for the formation of a white precipitate. Add silver nitrate (AgNO3) and look for a white precipitate. Add sodium hydroxide (NaOH) and look for a color change with red litmus paper. Add hydrochloric acid (HCI) and look for the presence of bubbles.