what colour are ammonia crystals?

Answer 1

you can not have ammonia crystals, ammonium sulphates yes.
ammonia is a gas at room temperature it is stored either in tanks in liquid form, at a temperature of -33 degrees C and 70 mbar, or in a sphere at a temperature of -5 degrees C and 70 psig.

Answer 2

Ammonia is a compound of nitrogen and hydrogen with the formula NH3. At standard temperature and pressure, ammonia is a gas. It is toxic and corrosive to some materials, and has a characteristic pungent odor. Ammonia used commercially can be anhydrous ammonia (not dissolved in water) or an aqueous solution of ammonia and water referred to as ammonium hydroxide. Anhydrous ammonia must be stored under pressure or at low temperature to remain a liquid. Ammonium hydroxide strength is measured in units of baume (density), with 26 degrees baume (about 30 weight percent ammonia at 15.5 °C) being the typical high concentration commercial product.[1] Household ammonia ranges in concentration from 5 to 10 weight percent ammonia. See Baumé scale.

An ammonia molecule has a trigonal pyramid shape, as predicted by VSEPR theory. This shape gives the molecule an overall dipole moment, and makes it polar so that ammonia readily dissolves in water. The nitrogen atom in the molecule has a lone electron pair, and ammonia acts as a base. That means that, when in aqueous solution, it can take a proton from water to produce a hydroxide anion and an ammonium cation (NH4+), which has the shape of a regular tetrahedron. The degree to which ammonia forms the ammonium ion depends on the pH of the solution—at "physiological" pH (~7), about 99% of the ammonia molecules are protonated.

The main uses of ammonia are in the production of fertilizers, explosives and polymers. It is also the active ingredient in household glass cleaners. Ammonia is found in small quantities in the atmosphere, being produced from the putrefaction of nitrogenous animal and vegetable matter. Ammonia and ammonium salts are also found in small quantities in rainwater, while ammonium chloride (sal-ammoniac) and ammonium sulfate are found in volcanic districts; crystals of ammonium bicarbonate have been found in Patagonian guano. The kidneys excrete NH4+ to neutralize excess acid. [2] Ammonium salts also are found distributed through all fertile soil and in seawater. Substances containing ammonia, or that are similar to it, are called ammoniacal.

Answer 3

I suspect that the question really was - what colour are ammonium compounds? And the answer is colourless, unless the anion is coloured. The most obvious examples are the orange crystals of ammonium dichromate(VI).

Answer 4

First ask yourself whether you can get ammonia crystals first. Okay???

Answer 5

I've never seen them, so I can't say. You have to cool ammonia (which is a colorless GAS at STP) down to -77.73°C before it solidifies. My graduate work was in ultra-high temperatures, not cryogenics . . .

Answer 6

Light creemy white.

Answer 7

NH3 - bright white

Answer 8

the colour is violet.