Buffers and Standards
Hydrogen ion buffers comprising a mixture of a weak acid and its conjugate base or vice-versa and used to stabilize pH; also diluents, washing solutions, and standard-value solutions used for a broad array of scientific calibration purposes.
The buffers used to calibrate pH meters may be certified and/or traceable to the National Institute of Standards and Technology (NIST). These buffers may also be color-coded for easy identification:
- Red: pH 4.0
- Yellow: pH 7.0
- Blue: pH 10.0
Tris (Tromethamine) (Granular/USP), Fisher Chemical™
CAS: 77-86-1 Molecular Formula: C4H11NO3 Molecular Weight (g/mol): 121.136 MDL Number: MFCD00004679 InChI Key: LENZDBCJOHFCAS-UHFFFAOYSA-N Synonym: Trishydroxymethylaminomethane,Tris Buffer,Tris,THAM,Trizma™,2-Amino-2-(hydroxymethyl)-1,3-propanediol,Tris base,Tris(hydroxymethyl)aminomethane,Trometamol PubChem CID: 6503 ChEBI: CHEBI:9754 IUPAC Name: 2-amino-2-(hydroxymethyl)propane-1,3-diol SMILES: C(C(CO)(CO)N)O
Karl Fischer Aqualine™ Titrant 5, for Karl Fischer Titration By Volumetry, Fisher Chemical
For two-component system. Water equivalent: 5.0mg H2O/mL
CO2 Activity Standard, 0.100 M Sodium Bicarbonate, Fisherbrand
CAS: 144-55-8 Molecular Formula: CHNaO3 Molecular Weight (g/mol): 84.01 MDL Number: MFCD00003528 InChI Key: UIIMBOGNXHQVGW-UHFFFAOYSA-M PubChem CID: 516892 ChEBI: CHEBI:32139 IUPAC Name: sodium hydrogen carbonate SMILES: [Na+].OC([O-])=O
Karl Fischer Aqualine™ Complete 5, for Karl Fischer Titration By Volumetry, Fisher Chemical™
Single-component reagent; Pyridine free
Hydrogen Peroxide, 50% (Certified), Fisher Chemical
CAS: 7722-84-1 Molecular Formula: H2O2 Molecular Weight (g/mol): 34.014 MDL Number: MFCD00011333 InChI Key: MHAJPDPJQMAIIY-UHFFFAOYSA-N Synonym: oxydol,perhydrol,superoxol,interox,hydrogen dioxide,inhibine,peroxaan,albone,hioxyl,kastone PubChem CID: 784 ChEBI: CHEBI:16240 IUPAC Name: hydrogen peroxide SMILES: OO
Phenylarsine Oxide Solution, 0.025N (Certified), Fisher Chemical
CAS: 637-03-6 Molecular Formula: C6H5AsO Molecular Weight (g/mol): 168.03 MDL Number: MFCD00001990 InChI Key: BQVCCPGCDUSGOE-UHFFFAOYSA-N Synonym: phenylarsine oxide,oxophenylarsine,arzene,phenylarsenoxide,arsenosobenzene,arsine, oxophenyl,phenyl arsine oxide,benzene, arsenoso,fenylarsinoxid,caswell no. 060 PubChem CID: 4778 ChEBI: CHEBI:75253 IUPAC Name: arsorosobenzene SMILES: O=[As]C1=CC=CC=C1
Ferric Chloride Solution, Fisher Chemical™
CAS: 10025-77-1 Molecular Formula: Cl3FeH12O6 Molecular Weight (g/mol): 270.29 MDL Number: MFCD00149712 InChI Key: NQXWGWZJXJUMQB-UHFFFAOYSA-K Synonym: Ferric chloride hexahydrate,Iron Trichloride,Perchlorure de Fer PubChem CID: 24380 ChEBI: CHEBI:30808 IUPAC Name: iron(3+) hexahydrate trichloride SMILES: O.O.O.O.O.O.[Cl-].[Cl-].[Cl-].[Fe+3]
Sodium Thiosulfate Pentahydrate Solution (0.025N (N/40)/Certified), Fisher Chemical
CAS: 10102-17-7 Molecular Formula: H10Na2O8S2 Molecular Weight (g/mol): 248.172 MDL Number: MFCD00003499 InChI Key: PODWXQQNRWNDGD-UHFFFAOYSA-L Synonym: sodium thiosulfate pentahydrate,ametox,sodium thiosulfate, pentahydrate,antichlor,tinver,disodium thiosulfate pentahydrate,unii-hx1032v43m,ccris 3952,thiosulfuric acid, disodium salt, pentahydrate,sodium hyposulfite pentahydrate PubChem CID: 61475 ChEBI: CHEBI:32150 IUPAC Name: disodium;dioxido-oxo-sulfanylidene-$l^{6}-sulfane;pentahydrate SMILES: O.O.O.O.O.[O-]S(=O)(=S)[O-].[Na+].[Na+]
Sodium Thiosulfate Pentahydrate Solution (0.1N (N/10)/Certified), Fisher Chemical™
CAS: 10102-17-7 Molecular Formula: H10Na2O8S2 Molecular Weight (g/mol): 248.172 MDL Number: MFCD00003499 InChI Key: PODWXQQNRWNDGD-UHFFFAOYSA-L Synonym: sodium thiosulfate pentahydrate,ametox,sodium thiosulfate, pentahydrate,antichlor,tinver,disodium thiosulfate pentahydrate,unii-hx1032v43m,ccris 3952,thiosulfuric acid, disodium salt, pentahydrate,sodium hyposulfite pentahydrate PubChem CID: 61475 ChEBI: CHEBI:32150 IUPAC Name: disodium;dioxido-oxo-sulfanylidene-$l^{6}-sulfane;pentahydrate SMILES: O.O.O.O.O.[O-]S(=O)(=S)[O-].[Na+].[Na+]
Ferrous Sulfate Solution 40% (w/v), for AOAC Method 932.05 for Citric Acid in Milk, Gravimetric Method, Fisher Chemical
CAS: 7782-63-0 Molecular Formula: FeH14O11S Molecular Weight (g/mol): 278.01 MDL Number: MFCD00149719 InChI Key: SURQXAFEQWPFPV-UHFFFAOYSA-L Synonym: iron ii sulfate heptahydrate,ferrous sulfate heptahydrate,presfersul,melanterite mineral,iron sulfate heptahydrate,iron 2+ sulfate heptahydrate,fesofor,fesotyme,haemofort,ironate PubChem CID: 62662 ChEBI: CHEBI:75836 IUPAC Name: λ2-iron(2+) heptahydrate sulfate SMILES: O.O.O.O.O.O.O.[Fe++].[O-]S([O-])(=O)=O
Phenylarsine Oxide Solution, 0.00564N (Certified), Fisher Chemical™
CAS: 637-03-6 Molecular Formula: C6H5AsO Molecular Weight (g/mol): 168.03 MDL Number: MFCD00001990 InChI Key: BQVCCPGCDUSGOE-UHFFFAOYSA-N Synonym: phenylarsine oxide,oxophenylarsine,arzene,phenylarsenoxide,arsenosobenzene,arsine, oxophenyl,phenyl arsine oxide,benzene, arsenoso,fenylarsinoxid,caswell no. 060 PubChem CID: 4778 ChEBI: CHEBI:75253 IUPAC Name: arsorosobenzene SMILES: O=[As]C1=CC=CC=C1
Potassium Ferricyanide Solution, 1%, Fisher Scientific™
CAS: 13746-66-2 Molecular Formula: C6FeK3N6 Molecular Weight (g/mol): 329.25 MDL Number: MFCD00011392 InChI Key: QMTKJUMXUDIUAQ-UHFFFAOYSA-N Synonym: potassium ferricyanide,red prussiate,potassium ferricyanate,tripotassium hexacyanoferrate,potassium cyanoferrate,iron potassium cyanide,tripotassium ferricyanide,tripotassium iron hexacyanide,tripotassium ferric hexacyanide,ccris 5559 PubChem CID: 26250 IUPAC Name: tripotassium hexacyanoirontris(ylium) SMILES: [K+].[K+].[K+].N#C[Fe+3](C#N)(C#N)(C#N)(C#N)C#N
Phenol, Saturated (pH 6.6/7.9, Liq.), Fisher BioReagents™
CAS: 108-95-2 Molecular Formula: C6H6O Molecular Weight (g/mol): 94.11 MDL Number: MFCD00002143 InChI Key: ISWSIDIOOBJBQZ-UHFFFAOYSA-N Synonym: carbolic acid,hydroxybenzene,phenic acid,phenylic acid,oxybenzene,benzenol,phenyl hydrate,monophenol,phenyl hydroxide,phenylic alcohol PubChem CID: 996 ChEBI: CHEBI:15882 IUPAC Name: phenol SMILES: OC1=CC=CC=C1
Hydrogen Peroxide, Fisher Chemical™
CAS: 7722-84-1 Molecular Formula: H2O2 Molecular Weight (g/mol): 34.014 MDL Number: MFCD00011333 InChI Key: MHAJPDPJQMAIIY-UHFFFAOYSA-N Synonym: oxydol,perhydrol,superoxol,interox,hydrogen dioxide,inhibine,peroxaan,albone,hioxyl,kastone PubChem CID: 784 ChEBI: CHEBI:16240 IUPAC Name: hydrogen peroxide SMILES: OO