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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Hardness Reagent A (odorless buffer), 2 oz w/ blue cap, Dropper BottleSKU: R-0614-C-EAManufacturer: Taylor TechnologiesHardness Reagent A (odorless buffer), 2 oz w/ blue cap, Dropper Bottle (1 per EA)Learn Morewas $24.28 Special Price $18.54 -
Zinc Acetate Solution, 500ML, Poly BottleSKU: LC271001-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $52.90 Special Price $40.69 -
Sodium Hydroxide 5% W/V, 4L, Poly BottleSKU: LC240404-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $103.70 Special Price $79.78 -
Bromate Bromide, 0.1N (0.017M), 1L, Amber GlassSKU: LC119502-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $87.10 Special Price $65.33 -
Yellow-Seven(TM) Buffer Solution, pH 7.00 (+/-0.01 @ 25 DEG C), Color-coded Yellow, Reference StandardSKU: B1168-500MLPL-EAManufacturer: Spectrum ChemicalYellow-Seven (TM) Buffer Solution, pH 7.00 (+/-0.01 @ 25 DEG C), Color-coded Yellow, Reference Standard is an inorganic solution in water. Spectrum solutions utilize the highest quality raw materials appropriate to your product. Most raw materials meet or exceed the specifications established by the American Chemical Society. Where appropriate, many finished products are traceable to NIST Standard Reference Materials. Manufacturing, quality control testing, and packaging are all performed in Spectrum’s own facilities. Record keeping and sample retention of all produced lots ensure product consistency and complete traceability. (1 per EA )Learn Morewas $61.80 Special Price $50.28 -
Sodium Hydroxide, 1.00 N Solution, 20L, CAS# 1310-73-2SKU: S-370-20LT-EAManufacturer: Spectrum ChemicalSodium Hydroxide, 1.00 N Solution is a standard solution of Caustic soda ideally suited for laboratory titrimetric techniques. You can rely on the quality of LabChem analytical test solutions for lot-to-lot reproducibility. (1 per EA )Learn Morewas $312.10 Special Price $253.95 -
Ammonium Chloride 5% W/V, 1L, Poly BottleSKU: LC110002-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $92.60 Special Price $69.45 - Sodium Potassium Tartrate 50% W/V, 1L, Poly BottleSKU: LC223102-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $158.30 Special Price $118.72
- Sodium Hydroxide, 0.3125N (0.3125M), 1L, Poly BottleSKU: LC243052-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $33.20 Special Price $24.90
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Sodium Chloride 0.9% W/V, 10L, Cubitainer®SKU: LC234606-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $146.90 Special Price $110.17 -
Iron Reagent #2, 2 ozSKU: R-0852-C-EAManufacturer: Taylor TechnologiesIron Reagent #2, 2 oz (1 per EA)Learn Morewas $14.93 Special Price $11.40 -
Iodine, 0.01 N (0.005 M) Solution, 1L, CAS# 2192-20-3SKU: I-091-1LTGL-EAManufacturer: Spectrum ChemicalIodine, 0.01 N (0.005 M) Solution (1 per EA )Learn Morewas $65.35 Special Price $53.17 - Sodium Hydroxide, 0.1N (0.1M) In Meoh, 4L, Poly BottleSKU: LC245504-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: UN1993 (1 per EA)Learn Morewas $208.50 Special Price $160.40
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Sodium Hydroxide 40% W/W, 20L, Poly DrumSKU: LC241205-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $373.00 Special Price $286.96 -
Hydrogen Peroxide, 3 Percent Solution, Reagent, 500mL, CAS# 7722-84-1SKU: H1060-500MLPL-CSManufacturer: Spectrum ChemicalHydrogen Peroxide, 3 Percent Solution, Reagent, is the simplest peroxide, a strong oxidizer that appears as a clear and slightly viscous liquid. Its oxidizing properties are so strong that it is considered a highly reactive oxygen species. Due to it being a weak acid it can form hydroperoxide or peroxide salts. One of its biggest uses is in the treatment of drinking water, removing odors, organic materials and the amount of Hydrogen sulfides and Iron. Its reagent grade means it is used as the standard against which other compounds are graded in analytical testing labs. (6 per CS )Learn Morewas $351.20 Special Price $337.73 - Ammonium Hydroxide, 5.0N (5.0M), 500ML, Poly BottleSKU: LC111101-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $86.80 Special Price $65.10
- Hydroxylamine Hydrochloride 10%, 500ML, Poly BottleSKU: LC155301-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $83.60 Special Price $62.70
- Ferrous Ammonium Sulfate Titrant, 1L, Amber GlassSKU: LC145502-EAManufacturer: LabChemShelf Life (months): 6, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $66.70 Special Price $50.03
- Ammonium Buffer, 1L, Poly BottleSKU: LC109712-EAManufacturer: LabChemShelf Life (months): 12, , UN Number: UN2672 (1 per EA)Learn Morewas $88.00 Special Price $66.00
- Barium Chloride 20% W/V, 4L, Poly BottleSKU: LC116054-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $200.70 Special Price $150.53
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Molybdate Reagent, gal, 4-packSKU: R-0601-G-4-PKManufacturer: Taylor TechnologiesMolybdate Reagent, gal, 4-pack (4 per PK )Learn Morewas $374.40 Special Price $334.95 -
Phosphoric Acid, 25% v/v Solution, 500 mLSKU: P1054-500mL-EAManufacturer: 710 Spirits Rocky Mtn Reagentso-Phosphoric Acid; White Phosphoric Acid (1 per EA)Learn More$30.85 - Starch 0.5% W/V W/Chloroform, 4L, Poly BottleSKU: LC253054-EAManufacturer: LabChemShelf Life (months): 12, , UN Number: (1 per EA)Learn Morewas $99.80 Special Price $76.78
- Sodium Hydroxide, 0.5N (0.5M), 10L, Cubitainer®SKU: LC243306-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $193.50 Special Price $148.86
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BEAD BATH 20 L, 120 V, TYPE B PLUG, Liters/EA: 20
was $1,794.65 Special Price $1,714.78
LPS 200uL Universal Pipet Tips, Yellow, Bulk, PK1000
was $20.00 Special Price $15.75
4L Yellow Buffer Solution pH 7.0 @ 25°C, Poly Bottle
was $74.64 Special Price $21.46
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