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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Quantity

0.1 mL (1)
0.1 mol (1)
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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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Solvent or Matrix

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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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Clear Liquid at 20°C (2)
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Technique

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

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Colored pH Buffer (35)

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Search Within Results

661 – 675 of 43,323 results

661

Calcium standard solution, for AAS, 1 mg/ml Ca in 2 to 5% HNO3

CAS: 7440-70-2 | Ca | 40.08 g/mol

Pricing & Availability
Specifications

Molecular Weight (g/mol)	40.08
ChEBI	CHEBI:29320
Solubility	Soluble in water
Physical Form	Solution
Chemical Name or Material	Calcium standard solution
Grade	AAS
SMILES	[Ca]
Concentration	997 to 1003 μg/mL of Ca(2+) in 0.5N HNO3 (20°C)
InChI Key	OYPRJOBELJOOCE-UHFFFAOYSA-N
PubChem CID	5460341
Name Note	1 mg/ml Ca in 0.5N HNO3
CAS	7732-18-5
Health Hazard 3	GHS P Statement: Avoid breathing dust/fume/gas/mist/vapors/spray. IF ON SKIN: Wash with plenty of soap and water. Wear protective gloves/protective clothing/eye protection/face protection. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. Keep only in original container. WARNING: The information provided on this web site was developed in compliance with European Union (EU) regulations and is correct to the best of our knowledge, information and belief at the date of its publication. The information given is designed only as a guide for safe handling and use. It is not to be considered as either a warranty or quality specification.
MDL Number	MFCD00010897 MFCD00085314
Health Hazard 2	GHS H Statement: Causes skin irritation. Causes serious eye damage. May cause respiratory irritation. May be corrosive to metals.
Health Hazard 1	GHS Signal Word: Danger
Packaging	Plastic bottle
IUPAC Name	calcium
Molecular Formula	Ca
Formula Weight	40.08

662

Sodium chloride, 0.1N Standardized Solution

CAS: 7647-14-5 Molecular Formula: ClNa Molecular Weight (g/mol): 58.44 MDL Number: MFCD00003477 InChI Key: FAPWRFPIFSIZLT-UHFFFAOYSA-M PubChem CID: 5234 ChEBI: CHEBI:26710 SMILES: [Na+].[Cl-]

Pricing & Availability
Specifications

PubChem CID	5234
CAS	7647-14-5
Molecular Weight (g/mol)	58.44
ChEBI	CHEBI:26710
MDL Number	MFCD00003477
SMILES	[Na+].[Cl-]
InChI Key	FAPWRFPIFSIZLT-UHFFFAOYSA-M
Molecular Formula	ClNa

663

Potassium Chloride Conductivity Standard, 5000 μS/cm at 25°C, Ricca Chemical

CAS: 7447-40-7 Molecular Formula: ClK Molecular Weight (g/mol): 74.55 MDL Number: MFCD00011360 InChI Key: WCUXLLCKKVVCTQ-UHFFFAOYSA-M PubChem CID: 4873 ChEBI: CHEBI:32588 IUPAC Name: potassium chloride SMILES: [Cl-].[K+]

Pricing & Availability
Specifications

PubChem CID	4873
CAS	7447-40-7
Molecular Weight (g/mol)	74.55
ChEBI	CHEBI:32588
MDL Number	MFCD00011360
SMILES	[Cl-].[K+]
IUPAC Name	potassium chloride
InChI Key	WCUXLLCKKVVCTQ-UHFFFAOYSA-M
Molecular Formula	ClK

664

Phosphate Standard, (1mL = 1mg PO₄), Certified, 1000ppm ±10ppm, LabChem™

CAS: 7778-77-0 Molecular Formula: H2KO4P Molecular Weight (g/mol): 136.08 MDL Number: MFCD00011401 MFCD00147253 InChI Key: GNSKLFRGEWLPPA-UHFFFAOYSA-M PubChem CID: 516951 ChEBI: CHEBI:63036 IUPAC Name: potassium dihydrogen phosphate SMILES: [K+].OP(O)([O-])=O

Pricing & Availability
Specifications

PubChem CID	516951
CAS	7778-77-0
Molecular Weight (g/mol)	136.08
ChEBI	CHEBI:63036
MDL Number	MFCD00011401 MFCD00147253
SMILES	[K+].OP(O)([O-])=O
IUPAC Name	potassium dihydrogen phosphate
InChI Key	GNSKLFRGEWLPPA-UHFFFAOYSA-M
Molecular Formula	H2KO4P

665

Thermo Scientific Chemicals CHES, 99%

CAS: 103-47-9 Molecular Formula: C8H17NO3S Molecular Weight (g/mol): 207.288 MDL Number: MFCD00003835 InChI Key: MKWKNSIESPFAQN-UHFFFAOYSA-N PubChem CID: 66898 IUPAC Name: 2-(cyclohexylamino)ethanesulfonic acid SMILES: C1CCC(CC1)NCCS(=O)(=O)O

Pricing & Availability
Specifications

PubChem CID	66898
CAS	103-47-9
Molecular Weight (g/mol)	207.288
MDL Number	MFCD00003835
SMILES	C1CCC(CC1)NCCS(=O)(=O)O
IUPAC Name	2-(cyclohexylamino)ethanesulfonic acid
InChI Key	MKWKNSIESPFAQN-UHFFFAOYSA-N
Molecular Formula	C8H17NO3S

666

Trimethylamine, pure, 7.3M (50 wt.%) aqueous solution

CAS: 75-50-3 | C3H9N | 59.11 g/mol

Pricing & Availability
Specifications

Boiling Point	30.0°C to 100.0°C
Linear Formula	(CH₃)₃N
Molecular Weight (g/mol)	59.11
ChEBI	CHEBI:18139
Color	Colorless
Physical Form	Liquid
Chemical Name or Material	Trimethylamine
Grade	Pure
SMILES	CN(C)C
InChI Key	GETQZCLCWQTVFV-UHFFFAOYSA-N
Density	0.8600g/mL
PubChem CID	1146
Percent Purity	48 to 52% (total base)
CAS	7732-18-5
MDL Number	MFCD00008327
Flash Point	−45°C
Solubility Information	Solubility in water: freely soluble. Other solubilities: soluble in alcohol, ether, benzene, toluene,, xylene, ethylbenzene and chloroform
Health Hazard 1	Danger
Synonym	trimethylamine,methanamine, n,n-dimethyl,dimethylmethaneamine,n-trimethylamine,trimethylamine solution,ch3 3n,trimethyl amine,trimethylamin,trimethyl-amine,fema number 3241
IUPAC Name	N,N-dimethylmethanamine
Molecular Formula	C3H9N
Formula Weight	59.11
Specific Gravity	0.86
Melting Point	-2.0°C

667

Thermo Scientific Chemicals Sodium phosphate, 0.2M buffer soln., pH 7.4

Pricing & Availability
Specifications

MDL Number	MFCD00146206
Solubility Information	Miscible with water. Immiscible with alcohol.
Physical Form	Liquid
pH	7.4
Chemical Name or Material	Sodium phosphate buffer soln.
TSCA	Yes
Recommended Storage	Ambient temperatures
Concentration	0.2 M

668

Acetic acid, 0.1N Standardized Solution

CAS: 64-19-7 Molecular Formula: C2H4O2 Molecular Weight (g/mol): 60.05 MDL Number: MFCD00036152 InChI Key: QTBSBXVTEAMEQO-UHFFFAOYSA-N PubChem CID: 176 ChEBI: CHEBI:15366 IUPAC Name: acetic acid SMILES: CC(O)=O

Pricing & Availability
Specifications

PubChem CID	176
CAS	64-19-7
Molecular Weight (g/mol)	60.05
ChEBI	CHEBI:15366
MDL Number	MFCD00036152
SMILES	CC(O)=O
IUPAC Name	acetic acid
InChI Key	QTBSBXVTEAMEQO-UHFFFAOYSA-N
Molecular Formula	C2H4O2

669

Potassium hydroxide, 0.5N Standardized Solution in methanol

CAS: 1310-58-3 Molecular Formula: HKO Molecular Weight (g/mol): 56.11 MDL Number: MFCD00003553 InChI Key: KWYUFKZDYYNOTN-UHFFFAOYSA-M Synonym: potassium hydroxide,caustic potash,potash lye,potassium hydrate,hydroxyde de potassium,potassa,potasse caustique,potassium hydroxide k oh,potassium hydroxide solution,caswell no. 693 PubChem CID: 14797 ChEBI: CHEBI:32035 SMILES: [OH-].[K+]

Pricing & Availability
Specifications

PubChem CID	14797
CAS	1310-58-3
Molecular Weight (g/mol)	56.11
ChEBI	CHEBI:32035
MDL Number	MFCD00003553
SMILES	[OH-].[K+]
Synonym	potassium hydroxide,caustic potash,potash lye,potassium hydrate,hydroxyde de potassium,potassa,potasse caustique,potassium hydroxide k oh,potassium hydroxide solution,caswell no. 693
InChI Key	KWYUFKZDYYNOTN-UHFFFAOYSA-M
Molecular Formula	HKO

670

Sodium biphenyl, 15-25%w/w solution in diethylene glycol diethyl ether, offered as 20 x 15mL

CAS: 5137-46-2 | C12H10Na | 177.202 g/mol

Pricing & Availability

671

Ricca Chemical Company Lead Subacetate TS, Ricca Chemical

CAS: 6080-56-4 Molecular Formula: C4H12O7Pb Molecular Weight (g/mol): 379.30 MDL Number: MFCD00150023 InChI Key: MCEUZMYFCCOOQO-UHFFFAOYSA-L Synonym: lead acetate trihydrate,lead diacetate trihydrate,bleiazetat german,bis acetato trihydroxytrilead,unii-rx077p88ry,ccris 9031,lead acetate ii , trihydrate,lead acetate jan,acetic acid, lead +2 salt trihydrate,acetic acid, lead 2+ salt, trihydrate PubChem CID: 22456 ChEBI: CHEBI:33112 IUPAC Name: λ2-lead(2+) diacetate trihydrate SMILES: O.O.O.[Pb++].CC([O-])=O.CC([O-])=O

Pricing & Availability
Specifications

PubChem CID	22456
CAS	6080-56-4
Molecular Weight (g/mol)	379.30
ChEBI	CHEBI:33112
MDL Number	MFCD00150023
SMILES	O.O.O.[Pb++].CC([O-])=O.CC([O-])=O
Synonym	lead acetate trihydrate,lead diacetate trihydrate,bleiazetat german,bis acetato trihydroxytrilead,unii-rx077p88ry,ccris 9031,lead acetate ii , trihydrate,lead acetate jan,acetic acid, lead +2 salt trihydrate,acetic acid, lead 2+ salt, trihydrate
IUPAC Name	λ2-lead(2+) diacetate trihydrate
InChI Key	MCEUZMYFCCOOQO-UHFFFAOYSA-L
Molecular Formula	C4H12O7Pb

672

Buffer solution, pH 8.00 (+/-0.024 @ 25oC), No Color, Specpure, NIST Traceable

CAS: 1310-73-2

Pricing & Availability
Specifications

Concentration or Composition (by Analyte or Components)	Sodium hydroxide: 0.7%; Potassium dihydrogen phosphate: 0.7%; Water: 98.6%
CAS	7732-18-5
MDL Number	MFCD00134130
Color	Yellow
Solubility Information	Miscible with water.
Physical Form	Liquid
Chemical Name or Material	Buffer solution
TSCA	Yes
Recommended Storage	Ambient temperatures
Vapor Pressure	23 hPa (17mm Hg) at 20°C

673

Thermo Scientific Chemicals TRIS, 1.0M buffer soln., pH 9.0

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

674

Aluminum chloride, 6.0N Standardized Solution

CAS: 7446-70-0 Molecular Formula: AlCl3 Molecular Weight (g/mol): 133.33 MDL Number: MFCD00003422 InChI Key: VSCWAEJMTAWNJL-UHFFFAOYSA-K IUPAC Name: aluminum(3+) trichloride SMILES: [Al+3].[Cl-].[Cl-].[Cl-]

Pricing & Availability
Specifications

CAS	7446-70-0
Molecular Weight (g/mol)	133.33
MDL Number	MFCD00003422
SMILES	[Al+3].[Cl-].[Cl-].[Cl-]
IUPAC Name	aluminum(3+) trichloride
InChI Key	VSCWAEJMTAWNJL-UHFFFAOYSA-K
Molecular Formula	AlCl3

675

Thermo Scientific Chemicals Sodium phosphate, 0.2M buffer soln., pH 8.0

Pricing & Availability
Specifications

MDL Number	MFCD00146206
Solubility Information	Fully miscible in water.
Physical Form	Liquid
pH	8.0
Chemical Name or Material	Sodium phosphate buffer soln.
TSCA	Yes
Recommended Storage	Ambient temperatures
Concentration	0.2 M

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Buffers and Standards

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Potassium Chloride Conductivity Standard, 5000 μS/cm at 25°C, Ricca Chemical GSA/VA ContractAvailable on GSA/VA contract for Federal Government customers.Learn More

Potassium Chloride Conductivity Standard, 5000 μS/cm at 25°C, Ricca Chemical