How could you detect the presence of the NH4 positive ion?

Answer 1

NH4+ can be detected by adding sodium hydroxide, NaOH, and noting the familiar odor of NH3 or by the use of red litmus. The reaction is as follow

NH4 +(aq) + OH⁻(aq)ß------- NH3(aq) + H2O(I)

Answer 2

One common method to detect the presence of the NH4 positive ion is through the addition of sodium hydroxide (NaOH) solution. When NH4 ion reacts with NaOH, it forms ammonia gas (NH3) which can be detected by its characteristic odor or by using indicators like red litmus paper which turns blue in the presence of ammonia gas.