method one:
1. Test method for ammonium ion: take a little of the drug to be tested in two test tubes, add a concentrated sodium hydroxide solution and heat it. is ammonium sulfate.
2. Principle: NH4+ + OH- = NH3↑ + H2O (heating)
NH4+ reacts with strong alkali to generate ammonia monohydrate, which is decomposed by heat to release ammonia gas. Ammonia gas is alkaline gas, which can make wet red litmus paper turn blue.
Method Two:
1. The test method of K+ uses flame color reaction: dip a little of the object to be tested with a clean platinum wire and burn it on an alcohol lamp. The purple flame can be observed through the blue cobalt glass is potassium sulfate.
2. Principle: Flame color reaction, also known as flame color test and flame color test, is the reaction of certain metals or their compounds that cause the flame to show a characteristic color when it is burned in a colorless flame. When alkali metals and their salts burn on a flame, electrons in atoms absorb energy and jump from orbitals with lower energy to orbitals with higher energy, but electrons in higher energy orbits are unstable and very A fast transition back to a lower energy orbit releases the excess energy in the form of light. The wavelength of the emitted light is in the visible light range (wavelength is 400nm to 760nm), so the flame can be colored.
The flame-colored purple contains potassium.
