How to distinguish ammonium bicarbonate and urea, thank you

The melting point of urea is more than 120 degrees! Lianhuiliang (station contact ta) ammonia bicarbonate and urea infrared spectra are definitely different, you will make an infrared sample, find a pure sodium bicarbonate and urea to do infrared, just compare it Xixi is very pitiful (station contact ta) smell,,, this okay? There is ammonia and carbon dioxide in both heating, but there is only carbon dioxide and no ammonia on the reaction side of ammonium bicarbonate and acid, and there is ben408 (station contact ta) on both sides of the diurea side to add calcium chloride solution, and there is ammonium bicarbonate precipitated.

Or soluble in formaldehyde, urea will form urea-formaldehyde resin. CS104 (site link) seems to be a question for junior high school students.

Soluble in water, add acid, bubbling ammonia bicarbonate. The small wood three insects (station contact ta) are generally powdered ammonium carbonate and have a large ammonia smell, and urea is generally granular and has no obvious ammonia smell. YCFXYH (station contact TA) each to a small amount, put in a test tube, add a small amount of distilled water to dissolve.

A small amount of dilute hydrochloric acid is dropped respectively, and ammonium bicarbonate is released by bubbles; It's urea;

The appearance is white or grayish crystals, with an ammonia odor. It is hygroscopic and easily soluble in water, and a strong ammonia odor can be smelled by rubbing a small amount of sample with your fingers. The sample is placed directly on the red-hot iron plate, which does not melt and decomposes directly, resulting in a large amount of white smoke and a strong ammonia smell.

Agricultural:

1.The nitrogen content is not the same, and the actual amount of fertilizer is not the same. For example, if urea is used for 10 kilograms, then ammonium bicarbonate will be used for 25 kilograms of acres, but ammonium bicarbonate is cheap, and in fact, it is more cost-effective to use ammonium bicarbonate.

2.Ammonium bicarbonate can be directly absorbed and utilized by crops, while urea needs to be converted into ammonium nitrogen under the action of soil microorganisms before it can be absorbed and utilized by crops in large quantities.

3.However, ammonium bicarbonate is easy to volatilize and lose, and the utilization rate is not high, the utilization rate of urea is about 33, and the utilization rate of ammonium carbonate is 17-20

Ammonium carbonate and urea belong to nitrogen fertilizers, both can be used as top dressing, and the differences between the two are as follows:

1. The fertilizer efficiency rate is different.

Ammonium carbonate is a fast-acting fertilizer, and urea is a medium-speed fertilizer, the fertilizer efficiency of ammonium carbonate is faster than urea, the conversion speed is short in the field, and the transformation rate of urea in the soil is relatively slow, and it takes about 7 days to be absorbed and utilized by crops after fertilizer.

2. The absorption and utilization of crops are different.

After ammonium carbonate is used in the soil, it exists in the soil in the form of ammonium nitrogen, which can be directly absorbed and utilized by the crop roots, and urea needs to go through a transformation period of 5-10 days after being used in the soil, and the fertilizer can be converted into ammonium carbonate through the action of soil urease before it can be absorbed and utilized by the crop roots, and if nitrogen fertilizer is intended to be applied to crops, it should be used at the latest 5-7 days before the fertilizer period.

3. The fertilizer efficiency is different at different temperatures.

The decomposition rate of ammonium carbonate is directly related to temperature, the higher the temperature, the faster the decomposition rate, and the greater the loss of fertilizer efficiency. When the temperature is lower than 20 degrees, the volatilization loss of ammonium carbonate is very small, and because ammonium carbonate has a high solubility, it can be directly absorbed and utilized by crop roots even when used in a temperature environment below 5 degrees.

In the soil temperature environment of about 10 degrees, urea generally takes 7-10 days to transform, and the lower the temperature, the longer the transformation time will be.

4. The loss rate in the soil is different.

After ammonium carbonate is applied to the soil, the ammonium nitrogen in the fertilizer can be very stably adsorbed by the soil particles, and it is not easy to lose the fertilizer effect with water, and the nutrient retention rate is higher than that of urea.

After applying urea into the soil, it will be dissolved in the soil solution in a molecular state, which is not only not easy to be adsorbed by soil particles, but is easy to lose fertilizer with water, so the stability and retention rate of nutrients are not as good as ammonium carbonate.

5. Different ways to use.

In terms of fertilizer efficiency, the decomposition and volatilization loss of ammonium carbonate is greater than that of urea, so the best fertilizer efficiency can be obtained by deep application of ammonium carbonate, and the best fertilization depth is generally about 8 cm. And ammonium carbonate can not be used in dry soil, only a certain moisture content in the soil can be completely dissolved, so after the drought fertilizer needs to be watered, at this point, the urea with slow fertilizer efficiency is not so restrictive.

Agricultural:

Urea gradually takes effect in the soil; Ammonium carbonate fertilizer is fast and volatile, and must be buried deep in the soil.

1.The nitrogen content is not the same, and the actual amount of fertilizer is not the same. For example, urea uses 10 kilograms of mu, and ammonium bicarbonate needs to use 25 kilograms of mu, but ammonium bicarbonate is cheap, and in fact, it is more cost-effective to use ammonium bicarbonate.

2.In terms of agricultural use, the period of fertilizer efficiency is different, ammonium bicarbonate can be directly absorbed and utilized by crops, while urea needs to be converted into ammonium nitrogen under the action of soil microorganisms before it can be absorbed and utilized by crops in large quantities, so urea gradually takes effect in the soil.

3.However, ammonium bicarbonate is easy to volatilize and lose, and ammonium carbonate fertilizer is fast and volatile, so it must be buried deep in the soil or the utilization rate is not high.

Urea gradually takes effect in the soil, does not need to be buried, ammonium carbonate fertilizer is fast and volatile, must be bought in the soil, but also have water.

Substances containing ammonium (NH4+) will produce gas ammonia when exposed to alkali, and the difference between urea and ammonium carbonate can be mixed with alkali belts such as sodium hydroxide, etc., slightly hot, ammonia odorous gas produces ammonium carbonate;

Substances containing carbonate (CO3 2-) will produce gas carbon dioxide when it encounters acid, and the difference between urea and ammonium carbonate can be dropped into the two substances respectively, such as dilute hydrochloric acid, etc., and the carbon dioxide that can make the clarified lime water turbid is ammonium carbonate;

Ammonium bicarbonate (NH4HCO3) is unstable, slightly hot and stupid dust can decompose ammonia, water, carbon dioxide, distinguish between urea and ammonium carbonate can take a small amount of two substances into the test tube, slightly hot, ammonia odor gas produces ammonium carbonate

Therefore, it is ammonium carbonate that is heated and decomposed; or add dilute hydrochloric acid, and ammonium carbonate with bubbles; Or co-heated with alkaline solution, ammonium carbonate is produced by ammonia

Question 1: What is the property of ammonium bicarbonate solution Alkaline, but very weak.

Question 2: What is the property of ammonium bicarbonate solution, as in the title, how to use salt hydrolysis to analyze alkaline.

The degree of hydrolysis of HCO3- is greater than that of NH4+.

Question 3: Hydrolysis of ammonium bicarbonate How does it double hydrolyze, what is the properties, and why HCO3-+H2O=H2CO3+OH-

nh4++h2o=

H++OH-=H2O, such a double hydrolysis but the degree is not large, alkaline. The reason is that HCO3- is too weak, so that more OH- is hydrolyzed than H+ is hydrolyzed by NH4+

Question 4: What is the property of ammonium bicarbonate solution Alkaline, but very weak.

Question 5: What is the absolute property of ammonium bicarbonate solution as the title How to use salt hydrolysis to analyze alkaline.

The degree of hydrolysis of HCO3- is greater than that of NH4+.

Question 6: Why is ammonium bicarbonate alkaline HCO3- will be hydrolyzed into OH-

Question 7: How does the hydrolysis of ammonium bicarbonate be double-hydrolyzed, what is the property, and why HCO3-+H2O=H2CO3+OH-

nh4++h2o=

H++OH-=H2O, so double hydrolysis but not much, alkaline. The reason is that HCO3- is too weak, so that more OH- is hydrolyzed than H+ is hydrolyzed by NH4+

The aqueous solution of ammonium bicarbonate is alkaline. Ammonium bicarbonate is unstable in nature, more than 36 decomposes into carbon dioxide, ammonia and water, 60 can be decomposed, hygroscopic, and the decomposition will be accelerated after deliquescent. Ammonium bicarbonate is a white compound that is granular, plate-like or columnar crystals with ammonia odor.

There are ammonium ions in the chemical formula of ammonium bicarbonate, which is a kind of ammonium salt with the old reed, and the ammonium salt cannot be placed together with the alkali, so the ammonium bicarbonate should not be put together with sodium hydroxide or calcium hydroxide.

Ammonium bicarbonate has the advantages of quick effect, low price, economy, non-compacted soil, suitable for various crops and various soils, can be used as base fertilizer, and can be used as top dressing, etc., and is welcomed by farmers. The annual dosage accounts for about 1 4 of the total output of nitrogen fertilizer, and it is the most widely used nitrogen fertilizer product in China except urea. The disadvantages of ammonium carbonate are mainly volatile and low utilization rate of nitrogen.

Therefore, in production, we should make use of our strengths and avoid weaknesses and use them reasonably.