this is an acid-base reaction (neutralization): nh4cl is an acid, koh is a base.
- nh4cl – ammonium chloride
- other names: sal ammoniac , salmiac , nushadir salt
- appearance: white solid, hygroscopic ; odourless colourless-to-white hygroscopic solid in various forms ; finely divided, odorless, white particulate dispersed in air.
- koh – potassium hydroxide
- other names: caustic potash , lye , potash lye
- appearance: white solid, deliquescent ; white hygroscopic solid in various forms ; odorless, white or slightly yellow lumps, rods, flakes, sticks, or pellets. [note: may be used as an aqueous solution.]
- names: potassium chloride , sylvite , muriate of potash
- appearance: white crystalline solid ; colourless hygroscopic crystals
- names: ammonia , azane (only intended for use in naming derivatives of ammonia) , hydrogen nitride
- appearance: colourless gas ; colourless gas or compressed liquefied gas with pungent odour ; colorless gas with a pungent, suffocating odor. [note: shipped as a liquefied compressed gas. kinh hồnasily liquefied under pressure.]
- h2o – water, oxidane
- other names: water (h2o) , hydrogen hydroxide (hh or hoh) , hydrogen oxide
- appearance: white crystalline solid, almost colorless liquid with a hint of blue, colorless gas