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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Sodium Chloride, Saturated Solution, 1 L, PolySKU: S1232-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsSodium Chloride, Saturated Solution, 1 L, Poly (1 per EA )Learn More$69.35 -
Test Solution A, 4.00 L Poly naturalSKU: CT002000-4A-EAManufacturer: Reagents IncTest Solution A, 4.00 L Poly natural (1 per EA )Learn Morewas $100.00 Special Price $76.93 -
Sodium pHospHate Solution, Saturated, 1L, Poly BottleSKU: LC247802-EAManufacturer: LabChemShelf Life (months): 12, , UN Number: (1 per EA)Learn Morewas $87.80 Special Price $67.55 -
Hydrochloric Acid, 5.0N (5.0M), 500ML, Amber GlassSKU: LC153601-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1789 (1 per EA)Learn Morewas $46.10 Special Price $34.57 -
Acetic Acid 30% V/V (3+7), 4L, Poly BottleSKU: LC102604-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2790 (1 per EA)Learn Morewas $122.00 Special Price $91.50 - Sodium Hypochlorite 2 - 3% W/V, 1L, Poly BottleSKU: LC246402-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $44.40 Special Price $34.16
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Acetic Acid, 5 Percent (w/v) Aqueous Solution, 500mL, CAS# 64-19-7SKU: A-101-500MLPL-EAManufacturer: Spectrum ChemicalAcetic Acid, 5 Percent (w/v) Aqueous Solution - 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 Morewas $118.40 Special Price $96.35 - Hydrochloric Acid, 2:1, 4.00 L Poly naturalSKU: CH120500-4A-EAManufacturer: Reagents IncHydrochloric Acid, 2:1, 4.00 L Poly natural (1 per EA )Learn Morewas $161.00 Special Price $120.96
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Diethylenetriaminepentaacetic Acid, Pentasodium Salt, 41 Percent Solution in WaterCAS# 140-01-2SKU: D1156-4LT-EAManufacturer: Spectrum ChemicalDiethylenetriaminepentaacetic Acid, Pentasodium Salt, 41 Percent Solution in Water is also known under the abbreviation DETA and is a colorless liquid that is hygroscopic and soluble in both water and polar organic solvents. It is used as a tridentate ligand. 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$774.95 -
Acetic Acid-Ammonium Acetate Buffer TS, (U.S.P. Test Solution), 4LSKU: A-284-4LT-EAManufacturer: Spectrum ChemicalAcetic Acid-Ammonium Acetate Buffer TS, (U.S.P. Test 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 $571.65 Special Price $549.72 -
Iodide Iodate N/126, 16 ozSKU: R-0633-126-E-EAManufacturer: Taylor TechnologiesIodide Iodate N/126, 16 oz (1 per EA)Learn Morewas $21.32 Special Price $16.29 - Sodium Hydroxide 21.5% W/W (6.64N), 1L, Poly BottleSKU: LC240952-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $94.20 Special Price $72.47
- Sodium Acetate, 2.0M (2.0N), 1L, Poly BottleSKU: LC228502-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $102.70 Special Price $77.03
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Sodium Hydroxide 10% W/W, 20L, Cubitainer®SKU: LC240755-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $302.40 Special Price $232.64 - Buffer Solution, (Giordano) pH 6.4, 1L, Poly BottleSKU: LC125902-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $55.60 Special Price $41.70
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Ehrlich'S Reagent, 1L, Amber GlassSKU: LC140802-EAManufacturer: LabChemShelf Life (months): 3, , UN Number: UN1993 (1 per EA)Learn Morewas $132.90 Special Price $99.67 - Sodium Hydroxide, 25% w/w, 200.00 L DrumSKU: CS155500-200E-EAManufacturer: Reagents IncSodium Hydroxide, 25% w/w, 200.00 L Drum (1 per EA )Learn Morewas $1,560.00 Special Price $1,169.64
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Copper Sulfate 10% W/V, 500ML, Poly BottleSKU: LC134401-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $40.30 Special Price $30.23 -
Ammonia Solution, FCC, 4L, CAS# 1336-21-6SKU: A1293-4LTPV-EAManufacturer: Spectrum ChemicalAmmonia Solution, FCC is a solution of Ammonia in water. It has many uses, but in food production it is used primarily as a leavening agent. Spectrum Chemical offers over 300 Food Grade (FCC) chemical ingredients packaged in laboratory size bottles to production drum quantities and are manufactured, packaged and stored under current Good Manufacturing Practices (cGMP) per 21CFR part 211 in FDA registered and inspected facilities. (1 per EA )Learn Morewas $340.85 Special Price $277.35 - Sodium Hydroxide 50% W/W, 4L, Poly BottleSKU: LC241504-EAManufacturer: LabChemShelf Life (months): , Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $167.90 Special Price $129.17
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HydroxynapHthol Blue, ACS, 25G, Poly BottleSKU: LC155709-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $58.60 Special Price $43.95 - Sulfuric Acid 14% V/V, 1L, Poly BottleSKU: LC256002-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2796 (1 per EA)Learn Morewas $55.20 Special Price $42.47
- Oxalic Acid Dihydrate Purified, 500.00 g wide mouthSKU: C2110500-500A5-EAManufacturer: Reagents IncOxalic Acid Dihydrate Purified, 500.00 g wide mouth (1 per EA )Learn Morewas $46.00 Special Price $34.56
- Sodium Acetate, 30% w/w Solution, Technical, 55 gal, PolySKU: S1175-55gal-EAManufacturer: 710 Spirits Rocky Mtn ReagentsSodium Acetate, 30% w/w Solution, Technical, 55 gal, Poly (1 per EA )Learn More$1,268.20
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LPS 200uL Universal Pipet Tips, Yellow, Bulk, PK1000
was $20.00 Special Price $15.75
BEAD BATH 20 L, 120 V, TYPE B PLUG, Liters/EA: 20
was $1,794.65 Special Price $1,714.78
4L Yellow Buffer Solution pH 7.0 @ 25°C, Poly Bottle
was $74.64 Special Price $21.46
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