Description
Specifications Table
Product Name – Potassium Nitrate ARS, ACS
Quantity/Pack Size – 500 g
Form – Crystalline Powder
Grade – ARS, ACS
Application – Analytical Reagent, Synthesis, Oxidizing Agent
Product Overview
Potassium Nitrate (KNO₃) in ARS/ACS grade is a high-purity, water-soluble crystalline compound widely recognized for its consistency and reliability in laboratory settings. This reagent-grade salt meets stringent American Chemical Society (ACS) and Analytical Reagent Standard (ARS) specifications, ensuring minimal impurities (≤0.005% insolubles) and a typical assay of 99.0–100.5%. Its fine, free-flowing powder form dissolves rapidly in water, making it suitable for precise volumetric preparations without clumping. The compound exhibits strong oxidizing properties, which are critical for redox reactions, while its stable shelf life under dry conditions minimizes degradation risks. Unlike technical-grade alternatives, this ACS-certified variant undergoes rigorous testing for heavy metals (≤5 ppm Pb), chlorides (≤0.001%), and sulfates (≤0.005%), guaranteeing reproducibility in sensitive applications. The 500 g pack size balances cost-efficiency for frequent users with convenient storage in airtight containers. Compatible with most glassware and non-reactive plastics, it avoids contamination risks associated with lower-grade salts. For optimal performance, store in a cool, moisture-free environment away from organic materials to prevent unintended reactions.
FAQs
1. What is the difference between ARS and ACS grades in Potassium Nitrate?
ARS (Analytical Reagent Standard) and ACS (American Chemical Society) grades both denote high purity, but ACS includes additional tests for specific impurities like heavy metals and residual acids. ARS is often sufficient for general lab use, while ACS is preferred for standardized analytical methods requiring stricter compliance.
2. Can this Potassium Nitrate be used as a fertilizer component?
While chemically identical to fertilizer-grade potassium nitrate, this ARS/ACS variant is not economically viable for agricultural use due to its high purity and cost. Fertilizer-grade versions typically contain higher impurity levels (e.g., sodium, calcium) but are significantly cheaper per kilogram.
3. How does humidity affect the storage of this product?
Potassium Nitrate is hygroscopic and will absorb moisture from humid air, leading to caking or premature dissolution. Store the sealed container with silica gel desiccant packets and avoid opening in high-humidity environments (>60% RH). Re-seal immediately after use.
4. Is this product compatible with stainless steel spatulas or scoops?
Yes, but prolonged contact with moist Potassium Nitrate may cause minor corrosion on stainless steel due to its oxidizing nature. For critical applications, use PTFE (Teflon) or polypropylene scoops to eliminate metal ion contamination risks entirely.
5. What alternatives exist for applications requiring lower oxidizing strength?
For less aggressive oxidizing needs, consider Potassium Chlorate (KClO₃) or Sodium Nitrate (NaNO₃), though both have distinct solubility and thermal stability profiles. Ammonium Nitrate (NH₄NO₃) offers higher nitrogen content but is less stable and requires careful handling.
