Description
Specifications Table
Product Name – Aluminum potassium sulfate, 12H2O AnalaR NORMAPUR® ACS reagent, Reag. Ph. Eur.
Quantity/Pack Size – 1 kg
Form – Crystalline solid
Grade – ACS Reagent, AnalaR NORMAPUR®, Reag. Ph. Eur.
Application – Analytical chemistry, titration, standardization
Product Overview
Aluminum potassium sulfate dodecahydrate (commonly known as potash alum) in AnalaR NORMAPUR® ACS reagent grade represents the gold standard for laboratory applications requiring exceptional purity and consistency. This crystalline compound meets rigorous ACS specifications, ensuring minimal impurities (typically ≤0.005% insoluble matter) and precise molecular composition. The Reag. Ph. Eur. certification further validates its suitability for pharmacopeial testing protocols. The dodecahydrate form provides excellent solubility in water (37.6 g/100 mL at 20°C) while maintaining stability under standard laboratory conditions. Its non-hygroscopic nature prevents moisture absorption during storage, preserving reagent integrity. The compound’s defined crystal structure enables reliable stoichiometric calculations in volumetric analysis. As a primary standard, it serves as an ideal reference material for acid-base titrations and complexometric determinations. The AnalaR NORMAPUR® designation guarantees batch-to-batch consistency, with each production lot undergoing comprehensive quality control testing for heavy metals, chloride, sulfate, and other potential contaminants. The reagent’s neutral pH in solution (6.0-7.5) makes it compatible with a wide range of analytical procedures without requiring pH adjustments.
FAQs
1. What is the exact chemical formula and molecular weight of this aluminum potassium sulfate?
The chemical formula is KAl(SO₄)₂·12H₂O with a molecular weight of 474.39 g/mol, accounting for the dodecahydrate water molecules.
2. How does the AnalaR NORMAPUR® grade differ from standard laboratory grades?
AnalaR NORMAPUR® represents the highest purity tier with stricter limits on trace impurities (typically 5-10x lower than standard grades) and additional quality documentation.
3. What is the recommended storage temperature range for maintaining stability?
Store between 15-25°C in tightly sealed containers to prevent efflorescence and maintain the crystalline structure.
4. Can this reagent be used for preparing primary standard solutions?
Yes, its ACS certification and high purity (typically >99.5%) qualify it as a primary standard for titrimetric analysis.
5. What is the typical shelf life when stored under ideal conditions?
When stored properly in original packaging, the reagent maintains specifications for 36 months from date of manufacture.
