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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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1 – 15 of 1,042 results
1

Thermo Scientific Chemicals HEPES, 1.0M buffer soln., pH 7.5

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

EDGE
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
2

Thermo Scientific Chemicals MES monohydrate, 98%

CAS: 145224-94-8 Molecular Formula: C6H15NO5S Molecular Weight (g/mol): 213.248 MDL Number: MFCD00149409 InChI Key: MIIIXQJBDGSIKL-UHFFFAOYSA-N PubChem CID: 16218417 IUPAC Name: 2-morpholin-4-ylethanesulfonic acid;hydrate SMILES: C1COCCN1CCS(=O)(=O)O.O

EDGE
PubChem CID 16218417
CAS 145224-94-8
Molecular Weight (g/mol) 213.248
MDL Number MFCD00149409
SMILES C1COCCN1CCS(=O)(=O)O.O
IUPAC Name 2-morpholin-4-ylethanesulfonic acid;hydrate
InChI Key MIIIXQJBDGSIKL-UHFFFAOYSA-N
Molecular Formula C6H15NO5S
3

Buffer solution pH 4.01 (+/-0.022 @ 25oC) No Color Specpure NIST Traceable

CAS: 1336-21-6 | H5NO | 35.05 g/mol

EDGE
Molecular Weight (g/mol) 35.05
ChEBI CHEBI:18219
Color Colorless
Physical Form Liquid
Chemical Name or Material Buffer solution
SMILES N.O
InChI Key VHUUQVKOLVNVRT-UHFFFAOYSA-N
Vapor Pressure 23 hPa (17mm Hg) at 20°C
PubChem CID 14923
MDL Number MFCD00066650
Solubility Information Miscible with water.
TSCA Yes
Recommended Storage Ambient temperatures
IUPAC Name azanium;hydroxide
Molecular Formula H5NO
Odor Odorless
4

Barium chloride, 10% w/v aq. soln.

CAS: 10361-37-2 Molecular Formula: BaCl2 Molecular Weight (g/mol): 208.23 MDL Number: MFCD00003445 InChI Key: WDIHJSXYQDMJHN-UHFFFAOYSA-L Synonym: barium chloride,barium dichloride,barium chloride solution,ccris 2286,barium chloride, anhydrous,barium chloride, ultra dry,bariumchlorid,dichlorobarium,dsstox_cid_24508 PubChem CID: 25204 ChEBI: CHEBI:63317 IUPAC Name: barium(2+);dichloride SMILES: [Cl-].[Cl-].[Ba++]

EDGE
PubChem CID 25204
CAS 10361-37-2
Molecular Weight (g/mol) 208.23
ChEBI CHEBI:63317
MDL Number MFCD00003445
SMILES [Cl-].[Cl-].[Ba++]
Synonym barium chloride,barium dichloride,barium chloride solution,ccris 2286,barium chloride, anhydrous,barium chloride, ultra dry,bariumchlorid,dichlorobarium,dsstox_cid_24508
IUPAC Name barium(2+);dichloride
InChI Key WDIHJSXYQDMJHN-UHFFFAOYSA-L
Molecular Formula BaCl2
5

Ultramark∣r 1621, Mass Spec Std

CAS: 105809-15-2 Molecular Formula: C6H18N3P3 Molecular Weight (g/mol): 231.189 MDL Number: MFCD00242454 InChI Key: DEBZEVJNWCNATM-MZWXYZOWSA-N PubChem CID: 44119860 IUPAC Name: 2,2,4,4,6,6-hexakis(deuteriomethyl)-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene SMILES: CP1(=NP(=NP(=N1)(C)C)(C)C)C

EDGE
PubChem CID 44119860
CAS 105809-15-2
Molecular Weight (g/mol) 231.189
MDL Number MFCD00242454
SMILES CP1(=NP(=NP(=N1)(C)C)(C)C)C
IUPAC Name 2,2,4,4,6,6-hexakis(deuteriomethyl)-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene
InChI Key DEBZEVJNWCNATM-MZWXYZOWSA-N
Molecular Formula C6H18N3P3
6

Thermo Scientific Chemicals Iodine, 0.01N Standardized Solution

CAS: 7553-56-2 | I2 | 253.81 g/mol

EDGE
Molecular Weight (g/mol) 253.81
ChEBI CHEBI:17606
Solubility Miscible with chloroform, carbon tetrachloride, carbon disulfide, cyclohexane, methanol, ethyl acetate, toluene, benzene, n-hexane, butan-2-ol, bromoethane, n-heptane, glycerol and diethyl ether
Color Red to Brown
Physical Form Liquid
Chemical Name or Material Iodine
SMILES II
InChI Key PNDPGZBMCMUPRI-UHFFFAOYSA-N
Vapor Pressure 23 hPa (17mm Hg) at 20°C
PubChem CID 807
Concentration or Composition (by Analyte or Components) Iodine: 0.13%; Potassium iodide: 2.5%; Water: 97.37%
CAS 7732-18-5
MDL Number MFCD00011355 MFCD00164163
TSCA Yes
Recommended Storage Ambient temperatures
Molecular Formula I2
EINECS Number 231-442-4
Formula Weight 253.81
7

Barium chloride, 0.1N Standardized Solution

CAS: 10361-37-2 Molecular Formula: BaCl2 Molecular Weight (g/mol): 208.23 MDL Number: MFCD00003445 InChI Key: WDIHJSXYQDMJHN-UHFFFAOYSA-L Synonym: barium chloride,barium dichloride,barium chloride solution,ccris 2286,barium chloride, anhydrous,barium chloride, ultra dry,bariumchlorid,dichlorobarium,dsstox_cid_24508 PubChem CID: 25204 ChEBI: CHEBI:63317 IUPAC Name: barium(2+);dichloride SMILES: [Cl-].[Cl-].[Ba++]

EDGE
PubChem CID 25204
CAS 10361-37-2
Molecular Weight (g/mol) 208.23
ChEBI CHEBI:63317
MDL Number MFCD00003445
SMILES [Cl-].[Cl-].[Ba++]
Synonym barium chloride,barium dichloride,barium chloride solution,ccris 2286,barium chloride, anhydrous,barium chloride, ultra dry,bariumchlorid,dichlorobarium,dsstox_cid_24508
IUPAC Name barium(2+);dichloride
InChI Key WDIHJSXYQDMJHN-UHFFFAOYSA-L
Molecular Formula BaCl2
8

Sulfate, Ion chromatography standard solution, Specpure™, SO4-2 1000μg/mL

MDL Number: MFCD00145343

EDGE
MDL Number MFCD00145343
9

MOPS, 99%

CAS: 1132-61-2 Molecular Formula: C7H15NO4S Molecular Weight (g/mol): 209.26 MDL Number: MFCD00006183 InChI Key: DVLFYONBTKHTER-UHFFFAOYSA-N PubChem CID: 70807 ChEBI: CHEBI:44115 SMILES: [O-]S(=O)(=O)CCC[NH+]1CCOCC1

EDGE
PubChem CID 70807
CAS 1132-61-2
Molecular Weight (g/mol) 209.26
ChEBI CHEBI:44115
MDL Number MFCD00006183
SMILES [O-]S(=O)(=O)CCC[NH+]1CCOCC1
InChI Key DVLFYONBTKHTER-UHFFFAOYSA-N
Molecular Formula C7H15NO4S
10

Sodium hydroxide, 0.1N Standardized Solution

CAS: 1310-73-2 Molecular Formula: HNaO Molecular Weight (g/mol): 39.997 MDL Number: MFCD00003548 InChI Key: HEMHJVSKTPXQMS-UHFFFAOYSA-M PubChem CID: 14798 ChEBI: CHEBI:32145 IUPAC Name: sodium;hydroxide SMILES: [OH-].[Na+]

EDGE
PubChem CID 14798
CAS 1310-73-2
Molecular Weight (g/mol) 39.997
ChEBI CHEBI:32145
MDL Number MFCD00003548
SMILES [OH-].[Na+]
IUPAC Name sodium;hydroxide
InChI Key HEMHJVSKTPXQMS-UHFFFAOYSA-M
Molecular Formula HNaO
11

Thermo Scientific Chemicals BICINE, 99%

CAS: 150-25-4 Molecular Formula: C6H12NNaO4 Molecular Weight (g/mol): 185.16 MDL Number: MFCD00004295 InChI Key: MFBDBXAVPLFMNJ-UHFFFAOYSA-M PubChem CID: 8761 ChEBI: CHEBI:40957 IUPAC Name: 2-[bis(2-hydroxyethyl)amino]acetic acid SMILES: [Na+].OCCN(CCO)CC([O-])=O

EDGE
PubChem CID 8761
CAS 150-25-4
Molecular Weight (g/mol) 185.16
ChEBI CHEBI:40957
MDL Number MFCD00004295
SMILES [Na+].OCCN(CCO)CC([O-])=O
IUPAC Name 2-[bis(2-hydroxyethyl)amino]acetic acid
InChI Key MFBDBXAVPLFMNJ-UHFFFAOYSA-M
Molecular Formula C6H12NNaO4
12

Buffer solution, pH 2.00 (+/-0.026 @ 25oC), No Color, Specpure, NIST Traceable

For Calibration of pH Meters | CAS: 7447-40-7

EDGE
Color Colorless
Traceability to NIST Yes
Physical Form Liquid
Chemical Name or Material Buffer solution
Vapor Pressure 23 hPa (17mm Hg) at 20°C
Concentration or Composition (by Analyte or Components) Potassium chloride: 0.7%; Hydrochloric acid: 0.7%; water: 98.6%
CAS 7732-18-5
Health Hazard 3 P234-P390
MDL Number MFCD00146252
Health Hazard 2 In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. Wear suitable gloves and eye/face protection. This material and/or its container must be disposed of as hazardous waste.
Solubility Information Soluble in water.
Health Hazard 1 H290
TSCA Yes
Recommended Storage Ambient temperatures
13

Sodium hydroxide, 0.05N Standardized Solution

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+]

EDGE
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
14

Silicon, plasma standard solution, Specpure™ Si 1000μg/mL

MDL Number: MFCD00085311

EDGE
MDL Number MFCD00085311
15

PIPES, 98%

CAS: 5625-37-6 Molecular Formula: C8H18N2O6S2 Molecular Weight (g/mol): 302.36 MDL Number: MFCD00006159 InChI Key: IHPYMWDTONKSCO-UHFFFAOYSA-N Synonym: pipes,1,4-piperazinediethanesulfonic acid,piperazine-n,n'-bis 2-ethanesulfonic acid,2,2'-piperazine-1,4-diyl diethanesulfonic acid,1,4-piperazinebis ethanesulfonic acid,unii-g502h79v6l,2-4-2-sulfoethyl piperazin-1-yl ethanesulfonic acid,piperazine-1,4-bis 2-ethanesulfonic acid,1,4-piperazine-diethanesulfonic acid,2,2'-piperazine-1,4-diyl bis ethanesulphonic acid PubChem CID: 79723 ChEBI: CHEBI:44933 IUPAC Name: 2-[4-(2-sulfoethyl)piperazin-1-yl]ethanesulfonic acid SMILES: C1CN(CCN1CCS(=O)(=O)O)CCS(=O)(=O)O

EDGE
PubChem CID 79723
CAS 5625-37-6
Molecular Weight (g/mol) 302.36
ChEBI CHEBI:44933
MDL Number MFCD00006159
SMILES C1CN(CCN1CCS(=O)(=O)O)CCS(=O)(=O)O
Synonym pipes,1,4-piperazinediethanesulfonic acid,piperazine-n,n'-bis 2-ethanesulfonic acid,2,2'-piperazine-1,4-diyl diethanesulfonic acid,1,4-piperazinebis ethanesulfonic acid,unii-g502h79v6l,2-4-2-sulfoethyl piperazin-1-yl ethanesulfonic acid,piperazine-1,4-bis 2-ethanesulfonic acid,1,4-piperazine-diethanesulfonic acid,2,2'-piperazine-1,4-diyl bis ethanesulphonic acid
IUPAC Name 2-[4-(2-sulfoethyl)piperazin-1-yl]ethanesulfonic acid
InChI Key IHPYMWDTONKSCO-UHFFFAOYSA-N
Molecular Formula C8H18N2O6S2