What Is Potassium Binoxalate?

Potassium binoxalate, more precisely called potassium hydrogen oxalate, is the monopotassium salt of oxalic acid. It is an acidic oxalate supplied as white or colorless crystals or a white crystalline powder.

Its chemical formula is KHC₂O₄, its CAS number is 127-95-7, and its molecular weight is 128.13 g/mol for the anhydrous substance. Because it provides both acidity and oxalate complexing behavior, potassium binoxalate is used in selected metal surface-treatment, laboratory, textile, cleaning and chemical-processing applications.

Commercial names are not always used consistently. Buyers should therefore confirm the CAS number, molecular formula, hydration state and assay basis before placing an order.

Potassium Binoxalate Quick Facts

The information above describes potassium hydrogen oxalate with CAS 127-95-7. The contracted specification and batch Certificate of Analysis should always take priority over general reference data.

Is Potassium Binoxalate the Same as Potassium Hydrogen Oxalate?

Yes. Potassium binoxalate and potassium hydrogen oxalate normally refer to the same compound: KHC₂O₄, CAS 127-95-7.

The word “binoxalate” is a traditional commercial name. “Potassium hydrogen oxalate” more clearly describes the chemical composition and is less likely to be confused with other potassium oxalates.

Potassium Binoxalate vs Potassium Oxalate and Potassium Tetroxalate

These materials are related but are not interchangeable.

Potassium tetroxalate dihydrate is commonly identified by CAS 6100-20-5 and has a molecular weight of approximately 254.19 g/mol. It should not be supplied in place of potassium binoxalate merely because the two products have similar commercial names.

A purchase order should state at least:

• Potassium hydrogen oxalate or potassium binoxalate

• CAS 127-95-7

• Required molecular formula or hydration state

• Minimum assay

• Required impurity limits

• Intended application

Why Does the Hydration State Matter?

The molecular weight of 128.13 g/mol applies to anhydrous KHC₂O₄. Some commercial documents may describe a hydrated form, including material represented as KHC₂O₄·H₂O.

A monohydrate would have a theoretical molecular weight of approximately 146.14 g/mol. If assay calculations, solution concentrations or dosing instructions are based on the wrong hydration state, the actual amount of active potassium hydrogen oxalate can be incorrect.

Before qualification, buyers should verify:

• Exact molecular formula

• Anhydrous or hydrated form

• Assay calculation basis

• Moisture or loss-on-drying method

• Molecular weight used in solution calculations

• Product identity shown on the SDS and COA

Typical Potassium Binoxalate Specifications

The following table presents reference purchasing parameters rather than a universal AOZUN specification. Final limits should be confirmed in the applicable Technical Data Sheet, quotation and sales contract.

Different applications require different limits. A metal-treatment process may emphasize assay, insoluble matter, iron and particle size, while an analytical laboratory may require tighter trace-impurity limits and documented test methods.

What Do the Main Quality Parameters Mean?

Assay

Assay indicates the measured potassium hydrogen oxalate content. Buyers should confirm whether the result is reported on an as-is, dried or anhydrous basis.

Water-Insoluble Matter

Low insoluble matter supports cleaner solution preparation and helps reduce sediment, blocked filters and visible residue.

Chloride and Sulfate

Chloride and sulfate limits can be important in metal processing, laboratory analysis and other applications sensitive to ionic contamination.

Iron and Heavy Metals

Trace metals may affect color, analytical results, surface quality or downstream reactions. The required limits should be based on the actual process rather than on a generic supplier specification.

Moisture or Loss on Drying

This test helps verify consistency and is especially important when distinguishing anhydrous material from a hydrated commercial form.

Particle Size

Particle size influences dissolution rate, dust generation, feeding behavior and blending uniformity. Buyers should specify whether they require crystals, fine powder or a controlled particle-size range.

How Does Potassium Binoxalate Work?

Potassium binoxalate combines an acidic hydrogen oxalate ion with potassium. In aqueous systems, its acidity can assist in loosening certain mineral residues, while oxalate ions can interact with selected metal ions. This combination explains its use in controlled analytical, cleaning and metal surface-treatment systems.

Why Water Quality and Surface Conditions Matter

Performance is affected by concentration, temperature, contact time, agitation, water hardness and the composition of the treated surface.

Oxalate can also interact with calcium and other multivalent ions. Hard water may therefore produce unwanted precipitation or reduce consistency. Laboratory trials should use the same water quality, substrate and operating conditions expected in production.

For metal applications, users should verify:

• Base-metal compatibility

• Existing coating or finish

• Type and thickness of the deposit

• Treatment concentration

• Contact time and temperature

• Rinsing procedure

• Wastewater treatment requirements

• Final surface appearance

Potassium Binoxalate Applications

Metal Surface Treatment

Potassium binoxalate may be used as an acidic component in selected metal-cleaning, polishing and surface-treatment formulations. It can assist with certain iron-containing stains, oxide residues and mineral deposits under controlled conditions.

It is not universally compatible with every alloy, coating or polished surface. Concentration, exposure time and rinsing conditions should be validated on representative test coupons before full-scale use.

Professional Cleaning Formulations

The product may be incorporated into formulated industrial or professional cleaning systems where controlled acidity and oxalate chemistry are required.

It should not be promoted as a general-purpose household cleaner. Formulators must assess user exposure, surface compatibility, labeling, packaging and local chemical regulations.

Analytical and Laboratory Reagents

Potassium hydrogen oxalate can be used in analytical chemistry, reagent preparation and research applications.

A standard industrial grade should not automatically be described as a primary standard. Applications requiring certified reference characteristics must use an appropriately qualified grade supported by the necessary certificate, traceability, uncertainty and test documentation.

Textile and Leather Processing

Potassium binoxalate has been used as a mordant or processing auxiliary in selected textile and leather operations. Its suitability depends on the fiber or substrate, dyes, process pH and discharge-control requirements.

Pilot testing is recommended to confirm shade, fastness, residue and substrate effects.

Specialty Photographic Processing

Potassium binoxalate has historical and specialty uses in certain photographic processes. Users should verify compatibility with the exact process chemistry rather than substituting it for another oxalate salt.

Chemical Processing

The product may function as an acidic oxalate source, processing aid or intermediate in suitably designed chemical systems. Reaction stoichiometry must account for its exact chemical form, purity and moisture content.

Potassium Binoxalate Solubility and Solution Preparation

Potassium binoxalate is more soluble in hot water than in cold water. Reference information reports a solubility of approximately 48.1 g per 100 g of water at 100°C, while cold-water dissolution is more limited.

When preparing a process solution:

1. Confirm the required concentration and hydration-state basis.

2. Use compatible process equipment and suitable-quality water.

3. Add the material gradually with controlled agitation.

4. Avoid generating airborne dust.

5. Control the temperature within the validated process range.

6. Check that the solution is clear before use.

7. Do not mix it with an unknown formulation or incompatible material.

8. Follow the current supplier SDS and site operating procedure.

These steps are general industrial considerations, not a substitute for a validated formulation or workplace risk assessment.

Factors That Can Affect Process Performance

Potassium binoxalate performance can change when any of the following variables change:

• Product assay or hydration state

• Solution concentration

• Water hardness

• pH

• Temperature

• Contact time

• Agitation

• Surface condition

• Metal alloy

• Soil or oxide composition

• Rinsing efficiency

• Presence of other complexing agents

• Accumulation of dissolved metal ions

For repeatable production results, users should establish measurable bath-control and replacement criteria.

Which Potassium Binoxalate Grade Should You Choose?

The lowest-priced grade is not always the lowest-cost option. Poor dissolution, excess insoluble matter or variable impurities can increase filtration, rework and process-control costs.

How Should Buyers Evaluate a Potassium Binoxalate Supplier?

A reliable supplier should be able to confirm product identity, not merely provide a commercial name.

Before approving a supplier, evaluate:

1. CAS number, formula and molecular weight

2. Anhydrous or hydrated form

3. Assay basis and analytical method

4. Batch-to-batch consistency

5. Relevant impurity limits

6. Availability of TDS, SDS and COA

7. Packaging and pallet configuration

8. Storage and shelf-life recommendations

9. Regulatory and transport information

10. Sample and pre-shipment testing options

11. Export-document capability

12. Change-notification and complaint procedures

Specifications copied from a generic database should not replace batch-specific quality documents.

What Documents Should a Supplier Provide?

Depending on the destination and intended use, buyers may request:

• Certificate of Analysis

• Safety Data Sheet

• Technical Data Sheet

• Product specification

• Commercial invoice

• Packing list

• Certificate of Origin

• Transport documentation

• Regulatory declarations

• Allergen, GMO or animal-origin statements when genuinely relevant

• Inspection or third-party test report when contractually required

The document version, product name, CAS number and batch number should be consistent across the complete shipment file.

Packaging Options

Potassium binoxalate may be supplied in laboratory packs or industrial bags, depending on grade and order volume. A common industrial configuration is a lined 25 kg bag, but availability must be confirmed when requesting a quotation.

Packaging should protect the material from:

• Moisture

• Contamination

• Physical damage

• Label loss

• Uncontrolled dust release

Custom packaging, palletization or labeling should be agreed before order confirmation.

Storage and Handling

Store potassium binoxalate in its original, tightly closed container in a cool, dry and well-ventilated location.

Recommended controls include:

• Preventing moisture ingress

• Avoiding incompatible chemicals

• Keeping containers clearly labeled

• Using suitable gloves and eye protection

• Controlling dust during transfer

• Washing after handling

• Restricting access to trained personnel

• Following the current SDS and local workplace rules

Do not store or handle the product near food, beverages or animal feed.

Potassium Binoxalate Safety Information

Potassium binoxalate is an oxalate chemical and should not be treated as a harmless salt. Supplier classifications may identify it as harmful if swallowed and harmful in contact with skin.

Avoid ingestion, inhalation of dust and contact with skin or eyes. Oxalates can interact with calcium in the body and may cause serious systemic effects following significant exposure.

Emergency procedures, first-aid measures and personal protective equipment must be based on the current SDS, actual workplace exposure and local regulations.

Transport and Regulatory Considerations

Transport classification can vary with product form, concentration, supplier classification and destination-country rules. Buyers should not rely on an online UN number copied from an unrelated product listing.

Before shipment, confirm:

• Proper shipping name

• UN number, if applicable

• Hazard class and packing group

• Marine or air transport restrictions

• Destination-country inventory status

• Required labels and documentation

• Local storage and use restrictions

The shipment-specific SDS and dangerous-goods assessment should determine the final transport arrangement.

Why Source Potassium Binoxalate from AOZUN?

AOZUN supports international B2B buyers seeking potassium binoxalate for industrial, laboratory and specialty chemical applications.

Support may include:

• Specification review before quotation

• Confirmation of chemical identity and hydration state

• Batch-specific quality documentation

• Industrial and laboratory packaging discussions

• Sample evaluation

• Export-document coordination

• Shipment planning

• Technical communication during supplier qualification

Product availability, specification, regulatory status and packaging should be confirmed in the final quotation and sales contract.

Information to Include in Your RFQ

For a faster and more accurate quotation, provide:

• Product name

• CAS number

• Required grade

• Anhydrous or hydrated form

• Minimum assay

• Required impurity limits

• Particle-size requirement

• Intended application

• Requested quantity

• Packaging requirement

• Destination port or delivery address

• Required documentation

• Sample requirement

• Target delivery schedule

If your specification is based on an existing product, include its TDS or COA for technical comparison.

Frequently Asked Questions

What is potassium binoxalate?

Potassium binoxalate is another name for potassium hydrogen oxalate, the acidic monopotassium salt of oxalic acid. Its anhydrous formula is KHC₂O₄.

What is the CAS number of potassium binoxalate?

The CAS number for potassium hydrogen oxalate is 127-95-7.

What is the molecular weight of potassium binoxalate?

The molecular weight of anhydrous KHC₂O₄ is 128.13 g/mol. A hydrated form has a different molecular weight and must be identified separately.

Is potassium binoxalate the same as potassium tetroxalate?

No. Potassium binoxalate and potassium tetroxalate have different formulas, molecular weights, acidities and typical applications. They should not be substituted without technical approval.

Is potassium binoxalate soluble in water?

It has limited solubility in cold water and is more soluble in hot water. Actual dissolution depends on temperature, agitation, particle size and water composition.

What is potassium binoxalate used for?

Typical uses include selected metal surface-treatment formulations, analytical reagents, textile or leather processing, professional cleaning systems, specialty photography and chemical processing.

Can potassium binoxalate remove rust?

It may assist in removing certain iron-containing stains or oxide deposits in properly designed formulations. Surface compatibility, concentration and treatment time must be tested before production use.

Is potassium binoxalate a primary standard?

Not every potassium binoxalate product is a primary standard. Only a specifically qualified or certified grade supported by appropriate documentation should be used for validated reference applications.

Is potassium binoxalate food grade?

A generic industrial or reagent-grade product must not be assumed to be food grade. Food use would require an explicitly qualified grade and compliance with all applicable regulations.

What specifications should buyers compare?

Compare assay, hydration state, water-insoluble matter, chloride, sulfate, iron, heavy metals, moisture, particle size, solution clarity and batch documentation.

How should potassium binoxalate be stored?

Store it tightly closed in a dry, cool and ventilated place, protected from moisture, contamination and incompatible chemicals.

Can AOZUN provide a sample and COA?

Sample availability, batch documentation, specification and packaging can be discussed during the quotation process. Include your application and required limits in the RFQ.

Request a Potassium Binoxalate Quote

Contact AOZUN for potassium binoxalate pricing, specifications, packaging and export information.

For an accurate proposal, send us your required grade, assay, impurity limits, quantity, application, destination and delivery schedule. Our team will review the requirement and confirm the appropriate commercial specification before order placement.