For pH buffers, check the pH value and the temperature it is stated at (most here are specified at 25 °C), the tolerance, and whether the lot is traceable to a reference standard if your quality system requires it. Color-coded buffers, such as red for pH 4, yellow for pH 7 and blue for pH 10, help avoid mix-ups during calibration. Sizes run from 500 mL bottles to 4 L bottles and 10 L and 20 L Cubitainers, so buy a size you will use before the expiration date. Electrode storage solution, offered in several sizes, keeps pH electrodes ready between uses.
Buffers and Solutions: common questions
What is 1,10-phenanthroline used for?
1,10-Phenanthroline is an organic compound that forms an intensely colored orange-red complex with ferrous iron, which is the basis of a common colorimetric method for measuring iron in water and other samples. The iron complex, known as ferroin, is also used as a redox indicator in titrations. It is sold as the monohydrate or anhydrous form, so check which one your method calls for.
How long do pH buffer solutions last once opened?
An unopened buffer is good until the manufacturer's expiration date. Once opened, buffers can change as they absorb carbon dioxide from the air or become contaminated, and alkaline buffers such as pH 10 are affected most. Pour what you need into a clean container, never return used buffer to the bottle, keep it capped, and replace it if calibration results drift.
What is the difference between a buffer and a reagent?
A buffer is a solution that resists changes in pH when small amounts of acid or base are added, usually a weak acid or base mixed with its salt. A reagent is any substance used to cause or measure a chemical reaction. Buffers are a kind of reagent used to hold pH steady in analyses, biological work and instrument calibration.
Shop by type: pH Buffers · Blends
Top brands: Reagents Inc · LabChem · Spectrum Chemical
Popular Buffers and Solutions:
Buffers and Solutions
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Poly(2-acrylamido-2-methyl-1-propanesulfonic Acid), 15 Percent Solution in Water, 25g, CAS# 88-89-1SKU: P1698-25GM-EAManufacturer: Spectrum ChemicalPoly(2-acrylamido-2-methyl-1-propanesulfonic Acid), 15 Percent Solution in Water is used as a thickening agent for acidic or basic cleaning agents, friction reducing agent, water-based lubricant, mineral scale remover and suspension aid for pigments and fillers. It is also a rheology control agent in water and some organic solvents. Ungraded products supplied by Spectrum are indicative of a grade suitable for general industrial use or research purposes and typically are not suitable for human consumption or therapeutic use. (1 per EA)Learn More$262.15 -
Titration Solvent, Mixture, Isopropyl Alcohol : Toluene (1:1), ASTMSKU: T1074-4LTGL-EAManufacturer: Spectrum ChemicalTitration Solvent, Mixture, Isopropyl Alcohol : Toluene (1:1), ASTM Standard Test Method for Acid Number of Petroleum Products by Potentiometric Titration. Toluene-isopropyl alcohol solvent blend. Capable of dissolving the test materials, with sufficient polarity for the method. Low inherent acid value: suitable for use as a blank. (1 per EA )Learn More$391.20 -
Tetrabutylammonium Hydroxide, 1.0 M Solution in Methanol, 100mL, CAS# 2052-49-5SKU: T1058-100ML-EAManufacturer: Spectrum ChemicalTetrabutylammonium Hydroxide, 1.0 M Solution in Methanol, is a chemical solution that is frequently used as a strong base in organic chemistry. It is used under phase-transfer conditions to effect alkylation and deprotonation. (1 per EA )Learn More$510.85 -
Acetic Acid, 1% v/v Solution, 3.8 LSKU: A1003-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsAcetic Acid, 1% v/v Solution, 3.8 L (1 per EA)Learn More$31.65 - Acetic Acid, 50% v/v Solution, 500 mLSKU: A1009-500mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsAcetic Acid, 50% v/v Solution, 500 mL (1 per EA)Learn More$29.15
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Ammonium Thiocyanate, 0.1 Normal, 1 L, PolySKU: A1035-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsN/10 (0.1 M) (1 per EA)Learn More$24.95 - Ammonium Thiocyanate, 0.1 Normal, 3.8 L, Poly GallonSKU: A1035-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsN/10 (0.1 M) (1 per EA)Learn More$50.70
- Ammonium Acetate BufferSKU: A1042-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsAmmonium Acetate Buffer (1 per EA)Learn More$53.55
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Bromocresol Green/Methyl Red, 0.1% w/v in Denatured Ethanol, 120 mLSKU: B1007-120mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentspH 4.6 (pink) - pH 5.2 (green-blue) (1 per EA)Learn More$19.00 - Bromocresol Green/Methyl Red, 0.1% w/v in Denatured Ethanol, 1 LSKU: B1007-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentspH 4.6 (pink) - pH 5.2 (green-blue) (1 per EA)Learn More$45.05
- Bromocresol Green/Methyl Red, 0.1% w/v in Denatured Ethanol, 500 mLSKU: B1007-500mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentspH 4.6 (pink) - pH 5.2 (green-blue) (1 per EA)Learn More$31.85
- Bromocresol Purple, 0.04% w/v Solution, 3.8 LSKU: B1008-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentspH 5.2 (yellow) - pH 6.8 (purple) (1 per EA)Learn More$44.05
- Bromocresol Purple, 0.1% w/v in Denatured Ethanol, 1 LSKU: B1010-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentspH 5.2 (yellow) - pH 6.8 (purple) (1 per EA)Learn More$42.90
- Bromothymol Blue, 0.04% w/v in Denatured Ethanol, 1 LSKU: B1014-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentspH 6.0 (yellow) - pH 7.6 (blue) (1 per EA)Learn More$34.80
- Bromophenol Blue, 0.1% w/v Solution, 1 LSKU: B1018-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentspH 3.0 (yellow) - pH 4.6 (blue) (1 per EA)Learn More$20.60
- Barium Chloride, 25% w/v, 1 L, PolySKU: B1024-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsBarium Chloride, 25% w/v, 1 L, Poly (1 per EA)Learn More$32.55
- Bromocresol Green Indicator, 0.1% w/v Aqueous, 1 LSKU: B1031-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentspH 3.8 (yellow) - pH 5.4 (blue) (1 per EA)Learn More$28.95
- Bromocresol Green/Methyl Red, 0.1% w/v Solution, 1 LSKU: B1032-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentspH 4.6 (pink) - pH 5.2 (green-blue) (1 per EA)Learn More$28.50
- Biuret Reagent, 1 LSKU: B1033-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsQualitative for Detection of Protein (1 per EA)Learn More$23.20
- Biuret Reagent, 3.8 LSKU: B1033-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsQualitative for Detection of Protein (1 per EA)Learn More$49.00
- Cupric Sulfate, 0.01 Molar, 1 L, PolySKU: C1010-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsN/100 (0.02 N) (1 per EA)Learn More$17.60
- Cupric Sulfate, 0.01 Molar, 3.8 L, Poly GallonSKU: C1010-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsN/100 (0.02 N) (1 per EA)Learn More$33.50
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Ceric Ammonium Sulfate, 0.1 Normal, 1 L, PolySKU: C1015-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsN/10 (0.1 M); in 2 N Sulfuric Acid (1 per EA)Learn More$56.05 - Cupric Sulfate, 0.016 Molar, 1 L, PolySKU: C1016-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsCupric Sulfate, 0.016 Molar, 1 L, Poly (1 per EA)Learn More$17.80
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