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Potassium Hydrogen Phthalate

A stable, crystalline compound (KHC₈H₄O₄) used as a primary standard in acid-base titrations and pH calibration due to its high purity.

Potassium Hydrogen Phthalate

1. Application

Potassium Hydrogen Phthalate (KHP) is widely used in laboratories for:

  • Primary standard for acid-base titrations (high purity standard for NaOH standardization)
  • Analytical chemistry applications
  • pH calibration of buffers
  • Laboratory reagent for quality control in pharmaceutical and chemical industries
  • Educational and research laboratory experiments

2. Compliance Standard

  • ISO 9001 certified manufacturing
  • AR / ACS / Reagent grade
  • Conforms to USP / BP / EP standards
  • Laboratory-grade purity suitable for primary standard use
  • GLP-compliant handling and packaging

3. Product Description

Potassium Hydrogen Phthalate is a white, crystalline, odorless powder with high purity. It is stable, non-hygroscopic under controlled storage, and widely used as a primary standard in acid-base titrations due to its high equivalent weight reproducibility.

  • Chemical Formula: KHC8H4O4
  • Molar Mass: 204.22 g/mol

4. Technical Specifications

Parameter

Specification

Material

Potassium Hydrogen Phthalate (KHP)

Appearance

White crystalline powder

Assay / Purity

≥ 99.5% (AR / ACS grade)

Moisture Content

≤ 0.5%

Solubility

Soluble in water (14 g/100 mL at 25°C), practically insoluble in alcohol

pH of 0.1% Solution

~4.0–5.0

Storage

Dry, cool place, away from moisture and CO2

Stability

Stable under normal lab conditions

5. Apparatus is Supplied

  • Potassium Hydrogen Phthalate in HDPE bottles or glass containers
  • Labeled with batch number, assay, and expiry
  • Certificate of Analysis (CoA) provided

6. Optional Accessories

  • Analytical balance (0.1 mg resolution)
  • Glass beakers and flasks
  • Burettes and pipettes for titration
  • Storage desiccator
  • pH meters for calibration

7. Common Capacities Available

  • 50 g
  • 100 g
  • 250 g
  • 500 g
  • 1 kg
  • 5 kg (bulk packs available)

8. Dimensions & Weight (Approx.)

Pack Size

Approx. Container Dimensions

Approx. Gross Weight

50 g

60 mm diameter × 100 mm height

80 g

100 g

70 mm × 120 mm

120 g

250 g

100 mm × 150 mm

270 g

500 g

120 mm × 180 mm

550 g

1 kg

150 mm × 200 mm

1.1 kg

5 kg

250 mm × 300 mm

5.5 kg

9. Safety & Handling

  • Non-toxic but avoid inhalation of dust
  • Use gloves and safety goggles during handling
  • Store in a dry, cool, and closed container
  • Not classified as hazardous under normal laboratory conditions

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