251275

Ácido cítrico

ACS reagent, ≥99.5%

• Sinônimo(s): 2-Hydroxy-1,2,3-propanetricarboxylic acid, 2-Hydroxypropan-1,2,3-tricarboxylic acid
• Fórmula linear: HOC(COOH)(CH₂COOH)₂
• Número CAS: 77-92-9
• Peso molecular: 192.12
• Beilstein: 782061
• Número CE: 201-069-1
• Número MDL: MFCD00011669
• Código UNSPSC: 12352100
• eCl@ss: 39021801
• ID de substância PubChem: 24855122
• NACRES: NA.21

Propriedades

• grau: ACS reagent
• Nível de qualidade: 200
• Ensaio: ≥99.5%
• Formulário: crystals
• Lim. expl.: 8 %, 65 °F
• Impurezas: Substances carbonizable by hot sulfuric acid, passes test
• resíduo de ignição: ≤0.02%
• pKa: (1) 3.13, (2) 4.76, (3) 6.4
• pf: 153-159 °C (lit.)
• traços de ânion: chloride (Cl^-): ≤0.001%; oxalate (C₂O₄^2-): passes test (limit about 0.003%); phosphate (PO₄^3-): ≤0.001%; sulfate (SO₄^2-): ≤0.002%
• traços de cátion: Fe: ≤3 ppm; Pb: ≤2 ppm
• grupo funcional: carboxylic acid; hydroxyl
• cadeia de caracteres SMILES: OC(=O)CC(O)(CC(O)=O)C(O)=O
• InChI: 1S/C6H8O7/c7-3(8)1-6(13,5(11)12)2-4(9)10/h13H,1-2H2,(H,7,8)(H,9,10)(H,11,12)
• chave InChI: KRKNYBCHXYNGOX-UHFFFAOYSA-N
• Informações sobre genes: human ... SRC(6714)

Descrição

Descrição geral

Citric acid is a weak organic acid that is commonly used for pH adjustment, as a chelating agent, as a buffering agent, derivatization and as starting material for the synthesis of citrate esters and other compounds.

Aplicação

Citric acid has been used to prepare:

• Phosphate citrate buffer for use in enzyme-linked immunosorbent assay.
• Citrate-stabilized ceria aqueous sol, which was employed in the synthesis of cerium oxide nanoparticles.
• Citric acid-Na₂HPO₄-buffered stock solution for use in the determination of fecal urease activity.
• Anticoagulant citrate dextrose solution A (ACD-A), which is employed during the isolation of blood-derived endothelial progenitor cells.

Citric acid has also been used:

• In a novel process which allows controlling of the particle size during the synthesis of palladium cuboctahedrons.
• To prepare citric acid-derived carbon nanodots (CNDs) by bottom-up carbonization method.
• As a bi-component chelating agent for the synthesis of Li4Ti₅O₁₂ (lithium titanate oxide) by a novel sol–gel method.

Outras notas

Go to Redi-Dri^™ Product Listing 791725

Informações legais

Redi-Dri is a trademark of Sigma-Aldrich Co. LLC

Informações de segurança

• Pictogramas: GHS07
• Palavra indicadora: Warning
• Frases de perigo: H319,H335
• Declarações de precaução: P261 - P264 - P271 - P280 - P304 + P340 + P312 - P305 + P351 + P338
• Classificações de perigo: Eye Irrit. 2 - STOT SE 3
• Órgãos-alvo: Respiratory system
• Código de classe de armazenamento: 11 - Combustible Solids
• Classe de risco de água (WGK): WGK 1
• Ponto de fulgor (°F): Not applicable
• Ponto de fulgor (°C): Not applicable
• Equipamento de proteção individual: dust mask type N95 (US), Eyeshields, Gloves