1.01964

di-Sodium tetraborate decahydrate

certified secondary standard reference material for pH measurement; directly traceable to primary SRM from NIST/PTB pH(S)=9.18₀ (25°C) Certipur^®

• Synonym(s): di-Sodium tetraborate decahydrate, Borax, Sodium biborate decahydrate, Sodium borate decahydrate
• Empirical Formula (Hill Notation): B₄Na₂O₇ · 10H₂O
• CAS Number: 1303-96-4
• Molecular Weight: 381.37
• UNSPSC Code: 41116107
• EC Index Number: 215-540-4
• NACRES: NA.24
• MDL number: MFCD00149193

Properties

• grade: certified reference material
• Quality Level: 300
• agency: complies with DIN 19266
• vapor pressure: 0.213 hPa ( 20 °C)
• product line: Certipur^®
• potency: 2660 mg/kg LD₅₀, oral (Rat), >2000 mg/kg LD₅₀, skin (Rabbit)
• pH: 9.2 (20 °C, 47 g/L in H₂O)
• mp: 75 °C (Elimination of water of crystallisation)
• solubility: 49.74 g/L
• density: 1.72 g/cm³ at 20 °C
• bulk density: 750 kg/m³
• application(s): environmental; food and beverages; general analytical; industrial qc; pharmaceutical
• format: neat
• storage temp.: 15-25°C
• SMILES string: [Na+].[Na+].B([O-])(OB([O-])OB=O)OB=O.O.O.O.O.O.O.O.O.O.O
• InChI: 1S/B4O7.2Na.10H2O/c5-1-9-3(7)11-4(8)10-2-6;;;;;;;;;;;;/h;;;10*1H2/q-2;2*+1;;;;;;;;;;
• InChI key: OJPFLODMGUZMKD-UHFFFAOYSA-N

Description

General description

Certipur^® certified secondary standard reference buffers are used to precisely calibrate and monitor pH measurement instruments and buffer solutions. They are quality controlled and qualified in our ISO/IEC 17025 and 17034 accredited calibration laboratories against certified primary standard reference materials (SRM) in compliance with DIN 19266, IUPAC, NIST, Ph. Eur and USP. Certipur^® reference materials offer maximum accuracy, reliability and convenience and help avoid costly repeat analyses.

Please visit ISO certificates and Site Quality Self-Assessments to access the current certificates of accreditation.
Download your certificate at http://www.sigma-aldrich.com to view certified values, including uncertainty and expiry date.

Application

di-Sodium tetraborate decahydrate [pH(S)=9.180 (25 °C)] is a certified secondary standard reference buffer used as a calibration buffer standard for pH instruments or pH electrodes.

Features and Benefits

• The product is delivered with a comprehensive, batch-specific Certificate of Analysis showing the relevant data for the quality management system.

The pH value of this Certipur^® buffer solution is measured using differential potentiometry with two platinum hydrogen electrodes against NIST & PTB primary SRMs [pH(S)=9.180 (25 °C)].

• It is a Certified Reference Material (CRM) offered in neat format.
• Intended for extremely precise calibration, qualification and monitoring of pH instruments and for testing other buffer solutions.

Analysis Note

pH-value (25 °C): 9.180 - 9.186
Identity: passes test

Legal Information

CERTIPUR is a registered trademark of Merck KGaA, Darmstadt, Germany

Safety Information

• pictograms: GHS07,GHS08
• signalword: Danger
• hcodes: H319 - H360FD
• pcodes: P202 - P264 - P280 - P305 + P351 + P338 - P308 + P313 - P337 + P313
• Hazard Classifications: Eye Irrit. 2 - Repr. 1B
• Storage Class: 6.1D - Non-combustible, acute toxic Cat.3 / toxic hazardous materials or hazardous materials causing chronic effects
• wgk: WGK 1
• flash_point_f: Not applicable
• flash_point_c: Not applicable