The appearance of urea is white, spherical particles, and it is easily soluble in water and liquid ammonia. When pure urea is heated to close to the melting point under normal pressure, it begins to show instability. If you put a clean iron sheet on the stove and put urea particles on it, you can see that the urea melts quickly and volatilizes, and at the same time a small amount of white smoke is emitted, and the smell of ammonia can be smelled.
Ammonium chloride is white crystals with a slight yellowish color, strong water absorption, and easy to agglomerate. Put a small amount of ammonium chloride on the fire and heat it, you can smell a strong pungent odor, accompanied by white smoke, ammonium chloride will quickly melt and all disappear, in the process of melting, you can see the unmelted part is yellow.
The appearance of ammonium bicarbonate is white or grayish crystals with an ammonia smell. It has strong hygroscopicity and is easily soluble in water, and the aqueous solution is weakly acidic. To easily identify ammonium bicarbonate, rub a small amount of sample with your fingers to smell the strong ammonia odor.
The appearance of superphosphate is dark gray, off-white, and light yellow. It is an acidic chemical fertilizer. It is sensitive to the action of alkali and easily loses its fertilizer effect. One part is soluble in water, and the aqueous solution is acidic. Under normal circumstances, the hygroscopicity is small, such as when the air humidity reaches 80% or more, it will absorb moisture and form a hard block.
The appearance of calcium-magnesium phosphate fertilizer is gray-white, gray-green or gray-black powder, which looks extremely fine. Under sunlight, shattered, glass-like objects are generally seen, shimmering, and no change is seen when heated on a fire. .
The appearance of the compound fertilizer is a gray-brown or off-white granular product. When the compound fertilizer is heated on the flame, white smoke can be seen, and the smell of ammonia can be smelled, and it cannot be completely melted.
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