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 Hydroxide, 30 Percent (w/v) Solution, 1L, CAS# 1310-73-2SKU: S-954-1LT-EAManufacturer: Spectrum ChemicalSodium Hydroxide, 30 Percent (w/v) 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 $93.50 Special Price $76.08 -
Acid Red 52, 25g, CAS# 3520-42-1SKU: A1586-25GM-EAManufacturer: Spectrum ChemicalAcid Red 52 is a fluorescent rhodamine dye also known as Sulforhodamine B and Kiton Red, and used as a polar tracer. 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$527.85 -
Starch Indicator, 0.5 Percent (w/v) Aqueous Solution, Stabilized, 4L, CAS# 9005-84-9SKU: S-244-4LT-EAManufacturer: Spectrum ChemicalStarch Indicator, 0.5 Percent (w/v) Aqueous Solution, Stabilized 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 $488.10 Special Price $469.37 -
Pot Hydroxide, 0.5 N / Ethanol, 4.00 L Poly naturalSKU: CP119500-4A-EAManufacturer: Reagents IncPot Hydroxide, 0.5 N / Ethanol, 4.00 L Poly natural (1 per EA )Learn Morewas $364.00 Special Price $273.24 -
Sodium Hydroxide, 0.02N (0.02M) In Meoh, 1L, Poly BottleSKU: LC245302-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: UN1993 (1 per EA)Learn Morewas $172.00 Special Price $129.00 -
Hydrochloric Acid 10% V/V (1+9), 10L, Cubitainer®SKU: LC150706-EAManufacturer: LabChemShelf Life (months): 36, Traceable to NIST, UN Number: UN1789 (1 per EA)Learn Morewas $311.60 Special Price $233.70 -
Sodium Carbonate, 0.025N (0.0125M), 500ML, Poly BottleSKU: LC230001-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $42.70 Special Price $32.02 -
Ammonium Hydroxide, 1 Molar, 3.8 L, Poly GallonSKU: A1100-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsAmmonium Hydroxide, 1 Molar, 3.8 L, Poly Gallon (1 per EA )Learn More$39.75 -
Sudan III Solution, 1% w/v in 70% Denatured Ethanol, 940 mLSKU: S1049-940mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsFat Stain (1 per EA)Learn More$24.65 - Hydrochloric Acid, 15% w/w, 20.00 L CubitainerSKU: CH129100-20F-EAManufacturer: Reagents IncHydrochloric Acid, 15% w/w, 20.00 L Cubitainer (1 per EA )Learn Morewas $282.00 Special Price $211.68
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Lanthanum Oxide, 100G, Poly BottleSKU: LC160409-EAManufacturer: LabChemShelf Life (months): , , UN Number: (1 per EA)Learn Morewas $64.90 Special Price $48.68 -
Barium Chloride, 0.1N (0.05M), 4L, Poly BottleSKU: LC116204-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $209.00 Special Price $156.75 - Biuret Reagent, 4L, Poly BottleSKU: LC116904-EAManufacturer: LabChemShelf Life (months): 12, , UN Number: (1 per EA)Learn Morewas $162.40 Special Price $121.80
- pHospHoric Acid 10% V/V, 4L, Poly BottleSKU: LC186504-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1805 (1 per EA)Learn Morewas $163.80 Special Price $122.85
- Ammonium Acetate 20% W/V, 1L, Poly BottleSKU: LC109652-EAManufacturer: LabChemShelf Life (months): 12, , UN Number: (1 per EA)Learn Morewas $86.20 Special Price $64.65
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Starch Indicator, 1 Percent (w/v) Aqueous Solution, Stabilized, 1L, CAS# 8047-15-2SKU: S-572-1LT-EAManufacturer: Spectrum ChemicalStarch Indicator, 1 Percent (w/v) Aqueous Solution, Stabilized, is used in chemistry as an indicator for redox titrations where triiodide is present. These titrations are typically useful in volumetric analysis for determination copper(II), antimony (V), chlorate, hydrogen peroxide, dissolved oxygen, sulfite and sulfide levels. (1 per EA )Learn Morewas $79.10 Special Price $70.21 -
Formaldehyde, 37 Percent, Solution, 20L, CAS# 50-00-0SKU: F3328-20LT-EAManufacturer: Spectrum ChemicalFormaldehyde, 37 Percent, Solution is also known as methanal and is the simplest aldehyde. It has many uses, one of which is formol, the famous embalming and tissue preserving liquid. It is also used in industrial application for the production of different types of resins. It is also a well known tissue fixative and was formerly a disinfectant. (1 per EA )Learn Morewas $2,354.70 Special Price $1,393.47 -
Silver Nitrate, 1 N Standardized Solution, 500mL, CAS# 7761-88-8SKU: S-180-500ML-EAManufacturer: Spectrum ChemicalSilver Nitrate, 1 N Standardized Solution (1 per EA )Learn Morewas $636.70 Special Price $518.08 - pH 7.00 Calibration Buffer, Yellow, 1 LSKU: P1002-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsNIST Traceable; pH = 7.00 ? 0.01 @ 25 ?C (1 per EA)Learn More$16.20
- Potassium Biiodate, 0.1N (0.0085M), 500ML, Poly BottleSKU: LC187401-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $73.50 Special Price $55.12
- Potassium Dichromate, 0.2N (0.0333M), 4L, Poly BottleSKU: LC190004-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $137.50 Special Price $103.13
- Ammonium Hydroxide, 6.0N (6.0M), 1L, Poly BottleSKU: LC111202-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2672 (1 per EA)Learn Morewas $105.40 Special Price $79.05
- Sodium Thiosulfate, 0.2N (0.2M), 4L, Poly BottleSKU: LC250654-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $101.90 Special Price $76.42
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Color Reagent-Nitrogen, 1L, Amber GlassSKU: LC132802-EAManufacturer: LabChemShelf Life (months): 3, , UN Number: UN1805 (1 per EA)Learn Morewas $152.80 Special Price $114.60
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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
4L Yellow Buffer Solution pH 7.0 @ 25°C, Poly Bottle
was $74.64 Special Price $21.46
LPS 200uL Universal Pipet Tips, Yellow, Bulk, PK1000
was $20.00 Special Price $15.75
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