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

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Molecular Weight (g/mol)

0.00 (1)
10.81 (14)
100.09 (33)
100.117 g/mol (1)
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100.15 (1)

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0.1 mL (1)
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0.5 mL (15)
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Percent Purity

≥14% (BF3) (1)
≥30% (RT) (1)
≥30% (titration) (1)
≥35% (RT) (1)
≥40% (3)
≥49% (2)
≥50% (3)

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pH

≥12 to ≤14 (6)
>11.5 (2)
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>13 (100)
>8 (1)
<0.5 (3)
<1 (99)

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Solvent or Matrix

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10% HCl (19)
10% HCl/1% HNO₃ (1)
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Concentration

≈0.000027 M (3)
≈0.0035 M (3)
≥30% (1)
≤0.1% in nitric acid (1)
≤2.5% KCl (T) (8)
0.00017 M (3)
0.001 M KCl (1)

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Physical Form

Aqueous Solution (30)
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AA (471)
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Calibrating the absorbance of spectrophotometers (1)
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Solution Type

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Aqueous (2)
Buffer (375)
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Colored pH Buffer (35)

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646 – 660 of 43,369 results

646

Thermo Scientific Chemicals HEPES sodium salt, 99%

CAS: 75277-39-3 Molecular Formula: C8H17N2NaO4S Molecular Weight (g/mol): 260.28 MDL Number: MFCD00036463 InChI Key: RDZTWEVXRGYCFV-UHFFFAOYSA-M Synonym: 2-[4-(2-Hydroxyethyl)-1-piperazine]ethanesulfonic acid sodium salt PubChem CID: 2724248 ChEBI: CHEBI:46758 IUPAC Name: sodium 2-[4-(2-hydroxyethyl)piperazin-1-yl]ethane-1-sulfonate SMILES: [Na+].OCCN1CCN(CCS([O-])(=O)=O)CC1

Pricing & Availability
Specifications

PubChem CID	2724248
CAS	75277-39-3
Molecular Weight (g/mol)	260.28
ChEBI	CHEBI:46758
MDL Number	MFCD00036463
SMILES	[Na+].OCCN1CCN(CCS([O-])(=O)=O)CC1
Synonym	2-[4-(2-Hydroxyethyl)-1-piperazine]ethanesulfonic acid sodium salt
IUPAC Name	sodium 2-[4-(2-hydroxyethyl)piperazin-1-yl]ethane-1-sulfonate
InChI Key	RDZTWEVXRGYCFV-UHFFFAOYSA-M
Molecular Formula	C8H17N2NaO4S

647

Phenol Standard, Certified, 1000ppm ±10ppm (1mL = 1mg), LabChem™

Phenol Standard, C6H6O, CAS Number-108-95-2, 7732-18-5, 500mL, 99.9, 0.1, CHEBI:15882, Colorless, 1000ppm +/-10ppm (1mL - 1mg), 1g/mL, 94.11, Certified, GHS H Statement Solution is not hazardous.

Pricing & Availability
Specifications

Linear Formula	C₆H₅O₈
Molecular Weight (g/mol)	94.11
ChEBI	CHEBI:15882
Solubility	Soluble in water
Color	Colorless
Physical Form	Liquid
Chemical Name or Material	Phenol Standard
Grade	Certified
SMILES	OC1=CC=CC=C1
Identification	Passes Test
Concentration	1000 ppm ±10 ppm (1mL = 1mg)
InChI Key	ISWSIDIOOBJBQZ-UHFFFAOYSA-N
Density	1g/mL
PubChem CID	996
Name Note	1000ppm (1mL = 1mg)
CAS	7732-18-5
Health Hazard 3	GHS P Statement If in contact with skin or eyes, rinse thoroughly with water for 15-20 minutes. If swallowed, get medical attention.
MDL Number	MFCD00002143
Health Hazard 2	GHS H Statement Solution is not hazardous.
Packaging	Amber Glass
Recommended Storage	Room Temperature
IUPAC Name	phenol
Molecular Formula	C6H6O
Formula Weight	94.11
CAS Max %	0.1

648

Sodium hydroxide, 20% w/v aq. soln.

CAS: 1310-73-2 Molecular Formula: HNaO Molecular Weight (g/mol): 39.997 MDL Number: MFCD00003548 InChI Key: HEMHJVSKTPXQMS-UHFFFAOYSA-M Synonym: sodium hydroxide,caustic soda,sodium hydrate,white caustic,soda lye,aetznatron,ascarite,sodium hydroxide na oh,sodium hydroxide solution,soda, caustic PubChem CID: 14798 ChEBI: CHEBI:32145 IUPAC Name: sodium;hydroxide SMILES: [OH-].[Na+]

Pricing & Availability
Specifications

PubChem CID	14798
CAS	1310-73-2
Molecular Weight (g/mol)	39.997
ChEBI	CHEBI:32145
MDL Number	MFCD00003548
SMILES	[OH-].[Na+]
Synonym	sodium hydroxide,caustic soda,sodium hydrate,white caustic,soda lye,aetznatron,ascarite,sodium hydroxide na oh,sodium hydroxide solution,soda, caustic
IUPAC Name	sodium;hydroxide
InChI Key	HEMHJVSKTPXQMS-UHFFFAOYSA-M
Molecular Formula	HNaO

649

Ammonium thiocyanate, 0.1N Standardized Solution

CAS: 7732-18-5 Molecular Formula: NH₄SCN MDL Number: MFCD00011428

Pricing & Availability
Specifications

CAS	7732-18-5
MDL Number	MFCD00011428
Molecular Formula	NH₄SCN

650

Potassium Permanganate, 0.100 N (N/10), 0.0200 M (M/50), Ricca Tightrant™

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651

Chloride, Ion chromatography standard solution, Specpure™ Cl∣- 1000μg/mL

MDL Number: MFCD00143949

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Specifications

MDL Number	MFCD00143949

652

CombiTitrant 1, MilliporeSigma™

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653

Viscosity standard, Specpure™, nominally 10cSt @ 40 and 2.7cSt @ 100

CAS: 8042-47-5 Molecular Formula: C16H10N2Na2O7S2 Molecular Weight (g/mol): 452.363 MDL Number: MFCD00084411 InChI Key: AEOVEGJBKQQFOP-DDVLFWKVSA-L PubChem CID: 9566064 IUPAC Name: disodium;(8Z)-7-oxo-8-(phenylhydrazinylidene)naphthalene-1,3-disulfonate SMILES: C1=CC=C(C=C1)NN=C2C(=O)C=CC3=CC(=CC(=C32)S(=O)(=O)[O-])S(=O)(=O)[O-].[Na+].[Na+]

Pricing & Availability
Specifications

PubChem CID	9566064
CAS	8042-47-5
Molecular Weight (g/mol)	452.363
MDL Number	MFCD00084411
SMILES	C1=CC=C(C=C1)NN=C2C(=O)C=CC3=CC(=CC(=C32)S(=O)(=O)[O-])S(=O)(=O)[O-].[Na+].[Na+]
IUPAC Name	disodium;(8Z)-7-oxo-8-(phenylhydrazinylidene)naphthalene-1,3-disulfonate
InChI Key	AEOVEGJBKQQFOP-DDVLFWKVSA-L
Molecular Formula	C16H10N2Na2O7S2

654

Thermo Scientific Chemicals TRIS, 1.0M buffer soln., pH 7.6

CAS: 77-86-1 Molecular Formula: C4H11NO3 Molecular Weight (g/mol): 121.136 MDL Number: MFCD00004679 InChI Key: LENZDBCJOHFCAS-UHFFFAOYSA-N PubChem CID: 6503 ChEBI: CHEBI:9754 IUPAC Name: 2-amino-2-(hydroxymethyl)propane-1,3-diol SMILES: C(C(CO)(CO)N)O

Pricing & Availability
Specifications

PubChem CID	6503
CAS	77-86-1
Molecular Weight (g/mol)	121.136
ChEBI	CHEBI:9754
MDL Number	MFCD00004679
SMILES	C(C(CO)(CO)N)O
IUPAC Name	2-amino-2-(hydroxymethyl)propane-1,3-diol
InChI Key	LENZDBCJOHFCAS-UHFFFAOYSA-N
Molecular Formula	C4H11NO3

655

HEPES, 1M Solution, pH 7.3, Molecular Biology Grade, Ultrapure

CAS: 7365-45-9 Molecular Formula: C8H18N2O4S Molecular Weight (g/mol): 238.30 MDL Number: MFCD00006158 InChI Key: JKMHFZQWWAIEOD-UHFFFAOYSA-N PubChem CID: 23831 ChEBI: CHEBI:42334 SMILES: OCCN1CCN(CCS(O)(=O)=O)CC1

Pricing & Availability
Specifications

PubChem CID	23831
CAS	7365-45-9
Molecular Weight (g/mol)	238.30
ChEBI	CHEBI:42334
MDL Number	MFCD00006158
SMILES	OCCN1CCN(CCS(O)(=O)=O)CC1
InChI Key	JKMHFZQWWAIEOD-UHFFFAOYSA-N
Molecular Formula	C8H18N2O4S

656

Thermo Scientific Chemicals Sodium borate, 0.5M buffer soln., pH 9.0

CAS: 1330-43-4 Molecular Formula: B4Na2O7 Molecular Weight (g/mol): 201.21 MDL Number: MFCD00081185 InChI Key: NXSVMNYRVBQCMO-UHFFFAOYSA-N IUPAC Name: disodium bicyclo[3.3.1]tetraboroxane-3,7-bis(ylium)-1,5-diuide-1,5-bis(olate) SMILES: [Na+].[Na+].[O-][B-]12O[B+]O[B-]([O-])(O[B+]O1)O2

Pricing & Availability
Specifications

CAS	1330-43-4
Molecular Weight (g/mol)	201.21
MDL Number	MFCD00081185
SMILES	[Na+].[Na+].[O-][B-]12O[B+]O[B-]([O-])(O[B+]O1)O2
IUPAC Name	disodium bicyclo[3.3.1]tetraboroxane-3,7-bis(ylium)-1,5-diuide-1,5-bis(olate)
InChI Key	NXSVMNYRVBQCMO-UHFFFAOYSA-N
Molecular Formula	B4Na2O7

657

Borane-tetrahydrofuran complex, 1M solution in THF, Stabilized, AcroSeal™

CAS: 14044-65-6 | C4H11BO | 85.94 g/mol

Pricing & Availability
Specifications

Molecular Weight (g/mol)	85.94
InChI Key	RMCYTHFAWCWRFA-UHFFFAOYSA-N
Density	0.8760g/mL
Treatment(s)	Stabilized
PubChem CID	11062302
Name Note	1M solution in tetrahydrofuran, stabilized
Fieser	01,199; 02,106; 03,76; 04,124; 05,184; 06,161; 07,89; 12,65; 17,101
Formula Weight	85.94
Color	Colorless
Physical Form	Liquid
Chemical Name or Material	Borane-tetrahydrofuran complex
SMILES	B.C1CCOC1
Merck Index	15, 1336
Concentration	0.96 to 1.08M
CAS	109-99-9
Health Hazard 3	GHS P Statement Keep away from heat/sparks/open flames/hot surfaces. - No smoking. IF ON SKIN (or hair): Take off immediately all contaminated clothing. Rinse skin with water/shower. Handle under inert gas. Protect from moisture. Wear protective gloves/protective clothing/eye protection/face protection. IF SWALLOWED: rinse mouth. Do NOT induce vomiting. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. Immediately call a POISON CENTER or doctor/physician.
MDL Number	MFCD00012429
Health Hazard 2	GHS H Statement May cause respiratory irritation. Causes serious eye damage. In contact with water releases flammable gases which may ignite spontaneously. Causes skin irritation. Harmful if swallowed. Highly flammable liquid and vapour. Suspected of causing cancer. Reacts violently with water. May form explosive peroxides. May cause drowsiness or dizziness.
Flash Point	−22°C
Packaging	AcroSeal™ Glass bottle
Solubility Information	Solubility in water: reacts.
Health Hazard 1	Danger
Synonym	borane-tetrahydrofuran complex,tetrahydrofuran borane,bh3.thf,borane tetrahydrofuran complex solution,borane-d3-thf complex solution,borane-tetrahydrofuran,unii-5ear4err1l,oxolane borane,boron; oxolane,borane thf
TSCA	TSCA
IUPAC Name	oxolane borane
Molecular Formula	C4H11BO
EINECS Number	237-881-8
Specific Gravity	0.876

658

Hyamine Solution, 0.004 M (0.004 N), Ricca Chemical

CAS: 121-54-0 Molecular Formula: C27H42ClNO2 Molecular Weight (g/mol): 448.088 InChI Key: UREZNYTWGJKWBI-UHFFFAOYSA-M Synonym: benzethonium chloride,quatrachlor,hyamine,phemeride,phemerol chloride,benzethoniumchloride,phemithyn,disilyn,kylacol,solamin PubChem CID: 8478 ChEBI: CHEBI:31264 IUPAC Name: benzyl-dimethyl-[2-[2-[4-(2,4,4-trimethylpentan-2-yl)phenoxy]ethoxy]ethyl]azanium;chloride SMILES: CC(C)(C)CC(C)(C)C1=CC=C(C=C1)OCCOCC[N+](C)(C)CC2=CC=CC=C2.[Cl-]

Pricing & Availability
Specifications

PubChem CID	8478
CAS	121-54-0
Molecular Weight (g/mol)	448.088
ChEBI	CHEBI:31264
SMILES	CC(C)(C)CC(C)(C)C1=CC=C(C=C1)OCCOCC[N+](C)(C)CC2=CC=CC=C2.[Cl-]
Synonym	benzethonium chloride,quatrachlor,hyamine,phemeride,phemerol chloride,benzethoniumchloride,phemithyn,disilyn,kylacol,solamin
IUPAC Name	benzyl-dimethyl-[2-[2-[4-(2,4,4-trimethylpentan-2-yl)phenoxy]ethoxy]ethyl]azanium;chloride
InChI Key	UREZNYTWGJKWBI-UHFFFAOYSA-M
Molecular Formula	C27H42ClNO2

659

Thermo Scientific Chemicals MES monohydrate, 99+%, for biochemistry

CAS: 145224-94-8 Molecular Formula: C6H15NO5S Molecular Weight (g/mol): 195.23 MDL Number: MFCD00149409 InChI Key: MIIIXQJBDGSIKL-UHFFFAOYSA-N Synonym: 2-(N-Morpholino)ethanesulfonic acid monohydrate PubChem CID: 16218417 IUPAC Name: 2-morpholin-4-ylethanesulfonic acid;hydrate SMILES: C1COCCN1CCS(=O)(=O)O.O

Pricing & Availability
Specifications

PubChem CID	16218417
CAS	145224-94-8
Molecular Weight (g/mol)	195.23
MDL Number	MFCD00149409
SMILES	C1COCCN1CCS(=O)(=O)O.O
Synonym	2-(N-Morpholino)ethanesulfonic acid monohydrate
IUPAC Name	2-morpholin-4-ylethanesulfonic acid;hydrate
InChI Key	MIIIXQJBDGSIKL-UHFFFAOYSA-N
Molecular Formula	C6H15NO5S

660

Potassium bromate/Potassium bromide, 0.1N Standardized Solution

Molecular Formula: KBrO₃/KBr MDL Number: MFCD00011359

Pricing & Availability
Specifications

MDL Number	MFCD00011359
Molecular Formula	KBrO₃/KBr

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Buffers and Standards

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Phenol Standard, Certified, 1000ppm ±10ppm (1mL = 1mg), LabChem™ GSA/VA ContractAvailable on GSA/VA contract for Federal Government customers.Learn More

Phenol Standard, Certified, 1000ppm ±10ppm (1mL = 1mg), LabChem™