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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Copper Reagent #1, .75 ozSKU: R-0860-A-EAManufacturer: Taylor TechnologiesCopper Reagent #1, .75 oz (1 per EA)Learn Morewas $9.38 Special Price $7.17 -
Sodium Hydroxide, 1.00 N Solution, 4L, CAS# 1310-73-2SKU: S-370-4LTPL-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 $113.65 Special Price $92.48 -
Alkaline Iodide Azide-1, 4L, Amber PolySKU: LC106704-EAManufacturer: LabChemShelf Life (months): 36, , UN Number: UN1824 (1 per EA)Learn Morewas $530.90 Special Price $398.17 -
Acid Digestion Reagent (19Th Ed.), 1L, Poly BottleSKU: LC105602-EAManufacturer: LabChemShelf Life (months): 12, , UN Number: UN2796 (1 per EA)Learn Morewas $108.90 Special Price $81.68 -
Sodium Chloride, 10% w/w Solution, 500 mL, PolySKU: CF1236-500mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsSodium Chloride, 10% w/w Solution, 500 mL, Poly (1 per EA )Learn More$19.65 - Ferric Chloride, 40% w/w, TechnicalSKU: F1031-500mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsFerric Chloride, 42? Be (1 per EA)Learn More$20.05
- Sodium Carbonate, 10% w/w Technical, 55 gal, PolySKU: S1176-55gal-EAManufacturer: 710 Spirits Rocky Mtn ReagentsSodium Carbonate, 10% w/w Technical, 55 gal, Poly (1 per EA )Learn More$534.35
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Edta, 0.05M (0.1N), 20L, Cubitainer®SKU: LC138705-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $362.30 Special Price $271.73 -
Potassium Ferricyanide 10% W/V, 500ML, Amber PolySKU: LC190501-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $86.90 Special Price $65.18 -
Sulfuric Acid, 0.5N (0.25M), 10L, Cubitainer®SKU: LC257406-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2796 (1 per EA)Learn Morewas $169.30 Special Price $126.98 -
ChloropHenol Red, Sodium Salt, 10G, Amber GlassSKU: LC130707-EAManufacturer: LabChemShelf Life (months): , , UN Number: (1 per EA)Learn Morewas $170.60 Special Price $127.95 - Nitric Acid, 15% v/v Solution, 500 mLSKU: N1006-500mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsADD LW1100-055 (500mL DOT ACID PACKER) (1 per EA)Learn More$25.55
- Lead Acetate, 5% w/v Solution, 3.8 L, Poly GallonSKU: L1016-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsLead Acetate, 5% w/v Solution, 3.8 L, Poly Gallon (1 per EA )Learn More$96.75
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Water Hardness Buffer, 500ML, Poly BottleSKU: LC268401-EAManufacturer: LabChemShelf Life (months): 2, , UN Number: (1 per EA)Learn Morewas $56.20 Special Price $43.23 - Sodium Hydroxide 50% W/W, 10L, Cubitainer®SKU: LC241506-EAManufacturer: LabChemShelf Life (months): , Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $419.40 Special Price $322.65
- Acetic Acid 50% V/V (1+1), 500ML, Poly BottleSKU: LC102901-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2790 (1 per EA)Learn Morewas $80.70 Special Price $60.52
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EDTA Disodium, 0.0575 M Solution, 500mL, CAS# 6381-92-6SKU: E-115-500MLPL-EAManufacturer: Spectrum ChemicalEDTA Disodium, 0.0575 M 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 $81.35 Special Price $66.19 - Acetic Acid, 3% v/v Solution, 500 mLSKU: A1005-500mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsAcetic Acid, 3% v/v Solution, 500 mL (1 per EA)Learn More$17.00
- Sodium Hydroxide, 0.0227N (0.0227M), 20L, Cubitainer®SKU: LC242305-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $247.70 Special Price $190.56
- Sulfuric Acid 20% V/V, 1L, Poly BottleSKU: LC256072-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2796 (1 per EA)Learn Morewas $62.60 Special Price $48.16
- Sulfuric Acid, 0.25N (0.125M), 4L, Poly BottleSKU: LC257204-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2796 (1 per EA)Learn Morewas $92.30 Special Price $71.01
- Fehlings Solution inAin, 20L, Cubitainer®SKU: LC142005-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $321.20 Special Price $240.90
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Bromocresol Green 0.1% (Aq), 125ML, Poly BottleSKU: LC118507-EAManufacturer: LabChemShelf Life (months): 36, , UN Number: (1 per EA)Learn Morewas $32.00 Special Price $24.00 - Sodium Hydroxide 33% W/W, 20L, Cubitainer®SKU: LC241155-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $327.00 Special Price $251.56
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