What is Monopotassium Phosphate. What is the difference between Potassium Phosphate Monobasic and Monopotassium Phosphate (KH₂PO₄)

KH₂PO₄

Potassium phosphate, monobasic (also called KH₂PO₄ or monopotassium phosphate) is basically a potassium salt of phosphoric acid.

Think of it as a very common, very useful source of two important nutrients/ions:

• Potassium (K⁺)

• Phosphate (H₂PO₄⁻)

It’s a white, water-soluble crystalline powder that shows up everywhere from labs to agriculture to food production.

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???? What is it used for?

1. Fertilizers & Plant Nutrition

This is one of its biggest uses.

• Supplies phosphorus → root growth, flowering, energy transfer (ATP)

• Supplies potassium → plant strength, water regulation, fruit development

It’s especially popular in hydroponics and greenhouse growing because it dissolves cleanly.

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2. Buffer Solutions in Laboratories

Monobasic potassium phosphate is a classic ingredient in phosphate buffer systems.

• Helps maintain stable pH in biological and chemical experiments

• Often paired with dibasic potassium phosphate (K₂HPO₄)

Used in:

• biochemistry

• molecular biology

• pharmaceutical research

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3. Food Additive

In the food industry, it’s used as:

• an acidity regulator

• an emulsifier

• a nutrient supplement

You may find it in:

• processed foods

• dairy products

• sports drinks

It has the food additive code E340(i) in many regions.

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4. Medical and Pharmaceutical Use

It can be used to treat or prevent low phosphate levels (hypophosphatemia) and as an electrolyte supplement.

Also used in IV solutions and drug formulations.

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5. Water Treatment

Phosphates like this are sometimes used to:

• control corrosion in pipes

• bind metals

• help stabilize water chemistry

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6. Industrial Applications

Used in manufacturing processes such as:

• ceramics

• detergents

• specialty cleaners

Formula: KH₂PO₄Molar mass: 136.086 g/mol
Form: white powder/crystals
CAS Number: 7778-77-0
EC Number: 231-913-4
Density: 2.338 g/cm³
Synonyms: aluminium diacetate hydroxide, aluminium monohydroxide diacetate, ALUMINIUM SUBACETATE, Diacetoxyhydroxyaluminum