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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Sulfuric Acid .12N, 2 oz w/ orange cap, Dropper BottleSKU: R-0687O-C-EAManufacturer: Taylor TechnologiesSulfuric Acid .12N, 2 oz w/ orange cap, Dropper Bottle (1 per EA)Learn Morewas $9.07 Special Price $6.93 -
Sulfuric Acid N/50, 32 ozSKU: R-0627S-50-F-EAManufacturer: Taylor TechnologiesSulfuric Acid N/50, 32 oz (1 per EA)Learn Morewas $23.47 Special Price $17.93 -
Potassium Lactate, 60 Percent Solution, 1kg, CAS# 868-14-4SKU: P1806-1KG-EAManufacturer: Spectrum ChemicalPotassium Lactate, 60 Percent Solution is used in personal care due to its high moisturizing properties as well as for its buffering capacity. 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$575.80 -
Nitric Acid, 15% v/v Solution, 2.2 LSKU: N1006-2.2L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsNitric Acid, 15% v/v Solution, 2.2 L (1 per EA)Learn More$47.75 -
Trichloroacetic Acid 3% W/V, 500ML, Amber GlassSKU: LC262001-EAManufacturer: LabChemShelf Life (months): 18, Traceable to NIST, UN Number: UN2564 (1 per EA)Learn Morewas $61.10 Special Price $47.01 -
Diazobenzenesulfonic Acid TS - 100mLSKU: TS14094-100ml-EAManufacturer: Dawn ScientificDiazobenzenesulfonic Acid TS - 100mL (1 per EA )Learn Morewas $54.62 Special Price $53.25 - Ferroxyl Reagent, 500 mLSKU: F1009-500mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsFerroxyl Reagent, 500 mL (1 per EA)Learn More$28.85
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Nickel Sulfate, 0.05 Molar, 500 mL, PolySKU: N1032-500mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsNickel Sulfate, 0.05 Molar, 500 mL, Poly (1 per EA )Learn More$34.15 - Nitric Acid, 15% v/v Solution, 1 LSKU: N1006-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsADD LW1100-056 (1L DOT ACID PACKER) (1 per EA)Learn More$26.05
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Perchloric Acid, 0.1 N Solution in Glacial Acetic Acid, (USP Volumetric Solution)SKU: P-107-500ML-EAManufacturer: Spectrum ChemicalPerchloric Acid, 0.1 N Solution in Glacial Acetic Acid, (USP Volumetric Solution) is an inorganic acid dissolved in an organic solvent. It's main characteristic is that it is stronger than both sulfuric and nitric acid. It is also used for its super acid properties and also as an etchant for certain metals. (1 per EA )Learn Morewas $113.80 Special Price $92.60 -
Phenolphthalein Indicator, 2 oz w/ white cap, Dropper BottleSKU: R-0638W-C-EAManufacturer: Taylor TechnologiesPhenolphthalein Indicator, 2 oz w/ white cap, Dropper Bottle (1 per EA)Learn Morewas $12.93 Special Price $9.88 -
Sodium Hydroxide, 1.2 N, 20.00 L HedpakSKU: CS143300-20E3-EAManufacturer: Reagents IncSodium Hydroxide, 1.2 N, 20.00 L Hedpak (1 per EA )Learn Morewas $232.00 Special Price $173.88 -
Sodium Hypochlorite 5% W/V, 500ML, Poly BottleSKU: LC246301-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $25.30 Special Price $19.47 - 1-Naphthol TS - 100mLSKU: TS14182-100ml-EAManufacturer: Dawn Scientific1-Naphthol TS - 100mL (1 per EA )Learn Morewas $44.62 Special Price $43.50
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Potassium Pyroantimonate TS, Solution, 500mL, CAS# 12208-13-8SKU: P-198-500ML-EAManufacturer: Spectrum ChemicalPotassium Pyroantimonate TS, Solution is a ready-for-use solution for the purpose of conducting USP, National Formulary and assay tests and is prepared according to the specifications of the USP Pharmacopeial Convention. (1 per EA )Learn Morewas $110.35 Special Price $106.12 -
N-(1-NapHthyl)-Ethylenediamine Dihydrochloride 0.1%, 125ML, White PolySKU: LC175507-EAManufacturer: LabChemShelf Life (months): 2, , UN Number: (1 per EA)Learn Morewas $58.00 Special Price $43.50 - Starch, Iodide-Free TS - 500mLSKU: TS14274-500ml-EAManufacturer: Dawn ScientificStarch, Iodide-Free TS - 500mL (1 per EA )Learn Morewas $119.62 Special Price $116.63
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Cupriethylenediamine, 0.5M, Solution, 1L, CAS# 1317-39-1SKU: C1451-1LT-EAManufacturer: Spectrum ChemicalCupriethylenediamine, 0.5M, Solution (1 per EA )Learn Morewas $122.40 Special Price $99.60 -
Isopropyl Alcohol, 91% v/v, Technical, 1 gal, Poly Gallon CAS# 67-63-0SKU: I1027-1gal-EAManufacturer: 710 Spirits Rocky Mtn ReagentsIsopropanol; 2-propanol (1 per EA)Learn More$25.85 - Kalling's Reagent II, 100.00 mL Poly naturalSKU: CK158000-100A-EAManufacturer: Reagents IncKalling's Reagent II, 100.00 mL Poly natural (1 per EA )Learn Morewas $67.00 Special Price $50.76
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Molybdate Reagent, 2 ozSKU: R-0601-C-EAManufacturer: Taylor TechnologiesMolybdate Reagent, 2 oz (1 per EA)Learn Morewas $12.82 Special Price $9.79 -
Sodium Hydroxide 50% W/W, 20L, Poly DrumSKU: LC241505-EAManufacturer: LabChemShelf Life (months): , Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $671.70 Special Price $516.75 - Sulfamic Acid, 10% w/v, 10.00 L CubitainerSKU: CS210000-10F-EAManufacturer: Reagents IncSulfamic Acid, 10% w/v, 10.00 L Cubitainer (1 per EA )Learn Morewas $113.00 Special Price $84.24
- Acetic Acid, 6% v/v Solution, 500 mLSKU: A1060-500mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsAcetic Acid, 6% v/v Solution, 500 mL (1 per EA)Learn More$17.75
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