Citric acid, 99.5%, for analysis, anhydrous | 220340025 | Thermofisher

Description

Specifications Table

Product Name – Citric Acid, 99.5%, For Analysis, Anhydrous Quantity/Pack Size – 2.5KG, 100GR, 500GR Form – White Crystalline Powder Grade – For Analysis (AR) Application – pH adjustment, chelation, biochemical assays

Product Overview

This high-purity anhydrous citric acid (99.5%) is specifically formulated for analytical applications where precision and consistency are critical. The anhydrous form eliminates moisture-related variability, making it ideal for titrations, buffer preparations, and as a chelating agent in biochemical protocols. Its fine crystalline structure ensures rapid dissolution without residue, while the AR-grade certification guarantees minimal impurities (≤0.05% heavy metals, ≤0.01% sulfate). The product undergoes rigorous quality control to meet ISO 17025 standards, with batch-specific COAs provided for traceability. Unlike monohydrate variants, this anhydrous form offers superior stability in humid Indian lab environments, maintaining its free-flowing properties even at 30°C/80% RH. The 99.5% assay is verified via potentiometric titration, ensuring reliable stoichiometric calculations in volumetric analysis. Packaged in HDPE containers with tamper-evident seals to prevent contamination during transit and storage.

FAQs

1. How does anhydrous citric acid differ from monohydrate in analytical applications?

Anhydrous citric acid contains no water molecules in its crystal lattice, providing 8.4% more active citric acid by weight compared to monohydrate. This translates to more accurate molar calculations in titrations and reduced variability in buffer preparations, particularly in humidity-sensitive protocols.

2. What is the typical shelf life when stored under Indian lab conditions?

When stored in original packaging at 15-30°C with desiccant, the product maintains ≥99.0% purity for 36 months. Indian labs should avoid exposure to direct sunlight and store away from ammonia or strong oxidizers to prevent degradation.

3. Can this grade be used for food or pharmaceutical applications?

While chemically identical to food-grade citric acid, this AR-grade product is manufactured in facilities handling analytical reagents. It lacks food safety certifications (FSSAI/USP) and may contain trace impurities from lab-grade processing aids.

4. What’s the recommended procedure for preparing a 0.1M citric acid solution?

Dissolve 19.212g of anhydrous citric acid in 800ml deionized water, adjust to pH 2.1 with 1M NaOH if required, then dilute to 1L. Use a class A volumetric flask and verify concentration via standardized NaOH titration for critical applications.

5. Are there any known incompatibilities with common lab solvents?

The powder reacts violently with strong oxidizers (e.g., potassium permanganate) and decomposes in concentrated sulfuric acid. It’s stable in ethanol, acetone, and DMSO at room temperature, but prolonged storage in these solvents may cause esterification.