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Potassium Phosphate Monobasic CAS 7778-77-0

Molecular Formula: H2KO4P

Formula Weight: 136.085541

ZSpharmac: Potassium Phosphate Monobasic Supplement

Product Name: Potassium Phosphate Monobasic
CAS No: 7778-77-0  
Purity: 99%

Basic Info

Product Name:Potassium Phosphate Monobasic
Other Names:Monobasic Potassium Phosphate, Crystal, NF
Place of Origin:Shandong, China
Brand Name:ZSpharmac
Type:Organic Chemical Raw Materials
Appearance:White Transparent Powder
EINECS No.:231-913-4
Storage:Store at +5°C to +30°C.
Provide:Potassium Phosphate Monobasic MSDS;
Potassium Phosphate Monobasic COA

What is Potassium Phosphate Monobasic?

Potassium Phosphate Monobasic is a high-efficiency instant phosphorus-potassium compound fertilizer containing phosphorus and potassium. It is used to provide nutrients needed for plant growth and development. It is suitable for any soil and crops, especially for areas where phosphorus and potassium nutrients are lacking at the same time. The crops that like phosphorus and potassium are mostly used for top dressing, seed soaking, and seed dressing outside the root, and the effect of increasing yield is remarkable. The aqueous solution can react with silver nitrate to form yellow silver dihydrogen phosphate precipitation, which can be used as an identification reaction.
Because potassium dihydrogen phosphate is more expensive and less agricultural products are produced, it is often used by soaking seeds or top dressing outside the roots. For field crops, the concentration is usually 0.2%, soaked for 18~20h, and can be sown after drying. If it is sprayed separately when used as top dressing outside the roots, the maximum concentration can be 0.5%. For example, in the jointing and booting stage of wheat and rice, it can be sprayed 1 or 2 times during the first and full blooming stages of cotton and rapeseed. When spraying twice, the interval is about 7~10 days, and the liquid consumption per mu is about 100~150kg. It can also be combined with other nutrients to form a complex nutrient solution for top dressing outside the roots. For example, a variety of leaf fertilizers used in field crops in North China are mainly composed of potassium dihydrogen phosphate, urea and some trace elements. In recent years, the composite nutrient solutions used in various parts of my country also use potassium dihydrogen phosphate as a high-concentration and relatively hydrophilic phosphorus-potassium fertilizer source. With the development of facility horticultural crops and drip irrigation and fertilizer irrigation, the demand for potassium dihydrogen phosphate products is increasing day by day.

Potassium Phosphate Monobasic Properties:

Melting point 252.6 °C (lit.)
Boiling point > 450 °C
density 2.338 g/mL at 25 °C (lit.)
storage temp. Store at +5°C to +30°C.
solubility H2O: 1.5 M at 20 °C, clear, colorless
form powder
color White transparent
Specific Gravity2.338
PH4.2-4.6 (20g/l, H2O, 20℃)
pka(1) 2.15, (2) 6.82, (3) 12.38 (at 25℃)
Water Solubility 222 g/L (20 ºC)


Potassium Phosphate Monobasic Uses

  1. Potassium Phosphate Monobasic is used in the food industry to manufacture baked goods, as leavening agent, flavoring agent, fermentation aid, nutritional fortifier, yeast food. Also used as buffer, chelating agent.
  2. Potassium Phosphate Monobasic is used as fertilizer, flavoring agent, brewing yeast culture agent, used to prepare buffer solution, and also used in medicine and manufacture of potassium metaphosphate.
  3. Potassium Phosphate Monobasic is used for fertilizing crops such as rice, wheat, cotton, rapeseed, tobacco, sugarcane, and apples.
  4. Potassium Phosphate Monobasic is used as a chromatographic analysis reagent and buffer, and is also used in the synthesis of medicines.、
  5. Potassium Phosphate Monobasic is used as a high-efficiency phosphorus-potassium compound fertilizer, suitable for various soils and crops.  In medicine, it is used to acidify uric acid as a nutritional agent.
  6. Potassium Phosphate Monobasic preparation buffer solution, determination of arsenic, antimony, phosphorus, aluminum and iron, preparation of phosphorus standard solution, preparation of various media for haploid breeding, determination of inorganic phosphorus and alkaline acidase activity in serum, preparation of bacterial serum Test medium for Leptospira, etc.
  7. Potassium Phosphate Monobasic is used as a feed nutritional supplement.
  8. Potassium Phosphate Monobasic is used as a dietary phosphorus supplement.

Potassium Phosphate Monobasic Precautions and Contraindications

1. It is forbidden to mix with alkaline products: the pH of the aqueous solution of 1% potassium dihydrogen phosphate is about 4.6, which is slightly acidic. When mixed with alkaline fertilizers and pesticides, chemical reactions will occur, resulting in flocculation, precipitation, discoloration, and heat generation. , the generation of bubbles and other abnormal chemical reactions, this time will lead to the failure of the function of potassium dihydrogen phosphate.
2. It is forbidden to mix with products containing carbonate (CO3-): because carbonate and hydrogen ions of potassium dihydrogen phosphate react to generate carbon dioxide (CO2) gas. Such as potassium carbonate, ammonium bicarbonate, ammonium bicarbonate, sodium bicarbonate, etc.
3. It is forbidden to mix with products containing copper ions: potassium dihydrogen phosphate cannot be mixed with copper preparations such as copper hydroxide, basic copper sulfate, copper calcium sulfate, cuprous oxide, copper ammonium, copper quinoline, etc. Copper ions will react with phosphate ions to form flocculation and precipitation.
4. Excessive use in the early stage of growth is prohibited: Potassium will have an antagonistic effect with magnesium, calcium and other ions, affecting the absorption of these two types of ions, which is not conducive to the growth of plant cells, affecting the length of plant seedlings, and has a greater impact on yield in the later stage. Therefore, it is not recommended to use potassium dihydrogen phosphate in the seedling stage (1-3 leaves) and before the flowering stage of vegetables and beans, so as to avoid damage to the seedlings, falling flowers and pods, and premature use on soybeans will cause yield reduction.
5. It is forbidden to use potassium dihydrogen phosphate as a substitute for base fertilizer: because potassium dihydrogen phosphate is very water-soluble, it is easy to dissolve in water, and it is also easily washed away by rain if it is buried deep in the soil. The effect is short, so it is not recommended for use. Base fertilizer use, base fertilizer or compound fertilizer, slow release and long-term effect. Potassium dihydrogen phosphate has good water solubility and strong quick-acting properties.
6. It is forbidden to use in high temperature time and high concentration: high temperature will cause the concentration of potassium dihydrogen phosphate solution to increase, which is easy to cause fertilizer damage. If the concentration is too high, it will also cause fertilizer damage to burn leaves and roots.

How to Use Potassium Phosphate Monobasic

The nutritional content of high-purity potassium dihydrogen phosphate is 52% phosphorus and 34% potassium. Phosphorus has a significant effect on the growth of roots, stems and peels of crops, and also has obvious effects in enhancing crop disease resistance, cold resistance and waterlogging resistance. There are several key periods when potassium dihydrogen phosphate is used. The first is the flower bud differentiation period. The flower bud differentiation period requires a large amount of phosphorus. Phosphorus also has a very good effect on improving the flowering and fruit setting rate of crops and reducing flower and fruit drop. Therefore, spraying 500 times of potassium dihydrogen phosphate solution on the leaves during the flower bud differentiation period will have a multiplier effect. The second is the fruit expansion period. Everyone knows that the fruit expansion period is when the demand for potassium is the greatest. Crops are also the most sensitive to potassium at this time. The effect of root application or foliar application is the most obvious during this period. When spraying 500 times of potassium dihydrogen phosphate on the foliage, it can be mixed with 200 times of glucose and 1000 times of urea, which can achieve twice the result with half the effort. The third is the process of the formation of anthocyanins in fruit coloring during the coloring period, and the formation of anthocyanins is directly related to the sugar content and sunlight, and the formation of sugars is greatly affected by potassium. Therefore, the role of potassium plays a key role in the coloration of fruits. Therefore, the effect of spraying 300-500 times of potassium dihydrogen phosphate on the leaves in the early stage of fruit coloring is twice the result with half the effort.

Production Method of Potassium Phosphate Monobasic

(1) Neutralization method. It is obtained by the neutralization of phosphoric acid and potassium hydroxide according to the measurement: the caustic potash is made into a solution with a relative density of 1.3 (about 30%), and it is neutralized with 50% phosphoric acid under constant stirring. The reaction temperature was maintained at 85-100°C, and the endpoint pH was controlled at 4.2-4.6* Congo red test paper was light purple). The neutralized solution was concentrated to a relative density of 1.32-1.33, filtered, and then cooled to below 36°C for crystallization. Centrifugal separation and drying to obtain the product. Mother liquor recovery. It can also be neutralized with potassium phosphate, and the process is similar to the above. (2) Phosphoric acid metathesis method. The metathesis reaction was carried out with saturated potassium chloride solution and excess 75% phosphoric acid at 120-130 °C. The hydrogen chloride gas and water produced absorb the by-product acid. Then, the excess phosphoric acid is neutralized with potassium hydroxide, and the end point pH is controlled at 4.2-4.6. Finally, the product is cooled and crystallized, centrifuged, and dried to obtain the product. Mother liquor reuse. It can also use thermal phosphoric acid (85) and agricultural potassium chloride as raw materials to produce feed potassium dihydrogen phosphate through steps such as decomposition, neutralization and defluorination. Take 49 g of agricultural KCL, dissolve it in 100 mL of water, add 1 g of KOH (industrial product), pour it into a flask after complete dissolution, and concentrate to a mass of 124-117.5 g. Add 56.4g of phosphoric acid while it is still hot, add about 39g of ammonium bicarbonate under stirring, and adjust the pH to 3.0-3.5. The precipitated crystals were filtered, rinsed with 10 mL of water, and drained. The obtained potassium dihydrogen phosphate was dissolved in 100Ml (2%) KOH solution, 2g SiO2 and a few drops of coprecipitating agent polyacrylamide were added to it, stirred for 20min to form potassium fluorosilicate precipitate, cooled to 30 ℃, filtered and added with an appropriate amount of Calcium carbonate, a defluorination auxiliary, was stirred for 10 minutes to form calcium fluoride precipitation. The filtrate is concentrated and cooled to 35-40°C, then adjusted to pH 4.4-4.7 with phosphoric acid, filtered and dried.

About Us

The production base is located in Zhangqiu chemical industry park and Tai’an high-tech chemical industry park. laboratory and workshop in strict accordance with the GMP standard and the product fit national ISO9001 and ISO2000 standards.

“Zhishang” products are exported to Europe, North and South America, the Middle East, Asia Pacific and Africa area, so as to establish a long-term and stable cooperation relationship with customer in the world.

Company Info
  • Business Type: Manufacturer
  • Product Range: Additive , Chemical Auxiliary & Catalyst , Organic Chemicals
  • Products/Service: Organic Intermediate,Inorganic Chemistry, APIs, Dyestuffs And Pigments, Fragrance And Spices, Food Additives
  • Total Employees: 51~100
  • Capital (Million US $): 10000000RMB
  • Year Established: 2016
Production Capacity
  • No. of Production Lines : 8
  • No. of QC Staff : 5 -10 People
  • OEM Services Provided : yes
  • Factory Size (Sq.meters) : 3,000-5,000 square meters
  • Certificate: ISO9001 , CE , GMP , API , MSDS
  • Factory Location : Diao Town Industry Park, Zhangqiu City, Jinan City, Shandong Province, China.


Pre-Sales Service

* Prompt reply and 24 hours online, professional team to provide best price and high quality product.

* Sample testing support.

* Every batch of products will be tested to ensureits quality.

*The packing also can be according the customers` requirment.

*Any inquiries will be replied within 24 hours.

*we provide Commerical Invoice, Packing List, Bill of loading, COA , Health certificate and Origin certificate. If your markets have any special requirements, let us know.


After-Sales Service

*The fact of logistics information monitoring.

* Any questions about the product can be consulted at any time.

*Product has any problem can return.


Do you accept sample order?

We will make samples before mass production, and after sample approved, we’ll begin mass production. Doing 100% inspection during production, then do random inspection before packing.



You can get free samples for some products,you only need to pay the shipping cost or arrange a courier to us and take the samples. You can send us your product specifications and requests,we will manufacture the products according to your requests.

What’s your MOQ?

Our MOQ is 1kg. But usually we accept less quantity such as 100g on the condition that sample charge is 100% paid.

Do you supply product report?

Yes. We’ll give you product analysis report before shipping.

  Is there a discount?

Different quantity has different discount.


1. ≤50kg, Express delivery recommended, usually called as DDU service;

2. ≤500kg, Air shipping recommended, usually called as FOB, CFR, or CIF service;

3. >500kg, sea shipping recommended, usually called as FOB, CFR, or CIF service;

4. For high value products, please select air shipping and express delivery for safe.

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