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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Total Alkalinity Indicator, 500.00 mL Glass amberSKU: CT144100-500C-EAManufacturer: Reagents IncTotal Alkalinity Indicator, 500.00 mL Glass amber (1 per EA )Learn Morewas $52.50 Special Price $40.39 -
Ceric Ammonium Nitrate TS - 500mLSKU: TS14070-500ml-EAManufacturer: Dawn ScientificCeric Ammonium Nitrate TS - 500mL (1 per EA )Learn Morewas $139.62 Special Price $136.13 -
Dodecyltrimethylammonium Chloride, 50 Percent Solution in Alcohol, High Purity, 500mL, CAS# 112-00-5SKU: D1072-500MLGL-EAManufacturer: Spectrum ChemicalDodecyltrimethylammonium Chloride, 50 Percent Solution in Alcohol, High Purity is a quaternary ammonium compound (QAC) commonly used as a cationic surfactant. The High Purity grade denotes that this chemical is the highest quality commercially available. Spectrum Chemical manufactured High Purity grade products meet the toughest regulatory standards for quality and purity. (1 per EA )Learn More$326.70 -
Sodium pHenate Solution, 500ML, Poly BottleSKU: LC247701-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: UN1760 (1 per EA)Learn Morewas $71.00 Special Price $54.62 - Sodium Hydroxide, 6.0N (6.0M), 500ML, Poly BottleSKU: LC244601-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $48.30 Special Price $36.22
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Silver Nitrate, 0.1N, Standardized Solution, 500mL, CAS# 7761-88-8SKU: S-163-500MLGL-CSManufacturer: Spectrum ChemicalSilver Nitrate, 0.1N, Standardized Solution is an inorganic aqueous solution. It is used to titrimetrically determine purity of products containing halides by the direct titration with standardized silver nitrate solution. (6 per CS )Learn Morewas $515.95 Special Price $419.83 -
Potassium Hydroxide 10% W/V, 1L, Poly BottleSKU: LC192002-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1814 (1 per EA)Learn Morewas $61.70 Special Price $46.28 -
Potassium Permanganate, 0.18N (0.036M), 4L, Amber GlassSKU: LC199904-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $121.60 Special Price $91.20 - Sodium Hydroxide, 0.1562 N, 4.00 L Poly naturalSKU: CS135800-4A-EAManufacturer: Reagents IncSodium Hydroxide, 0.1562 N, 4.00 L Poly natural (1 per EA )Learn Morewas $102.00 Special Price $76.68
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Starch Indicator Solution, galSKU: R-0636-G-EAManufacturer: Taylor TechnologiesStarch Indicator Solution, gal (1 per EA)Learn Morewas $178.86 Special Price $136.63 -
EDTA Disodium, 0.01M, 1 ml = 1 mg CaCO3 With Mg, Solution, 500mL, CAS# 6381-92-6SKU: E-110-500MLPL-EAManufacturer: Spectrum ChemicalEDTA Disodium, 0.01M, 1 ml = 1 mg CaCO3 With Mg, Solution, is also referred to as Ethylenediaminetetraacetic acid. It is a solid that has no color and is water soluble. It is mainly used as a complexing agent for the dissolution of metal ions in fields such as medicine, industry, cosmetics and laboratories. (1 per EA )Learn Morewas $215.70 Special Price $175.51 -
Vario Silica Hr Citric Acid, F10 100 Pack, Ea/1SKU: 531710-EAManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 2106269. (1 per EA )Learn More$29.74 - Edta, 0.25M (0.5N), 1L, Poly BottleSKU: LC139102-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $132.90 Special Price $99.67
- Sodium Hydroxide 50% W/W, 1L, Poly BottleSKU: LC241502-EAManufacturer: LabChemShelf Life (months): , Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $104.80 Special Price $80.62
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Diluted Hydrochloric Acid, 10 Percent (w/v), NF, 20L, CAS# 7647-01-0SKU: HY105-20LTBL-EAManufacturer: Spectrum ChemicalDiluted Hydrochloric Acid, 10 Percent (w/v), NF is a pH acidifier excipient. All Spectrum Chemical NF grade products are manufactured, packaged and stored under current Good Manufacturing Practices (cGMP). (1 per EA )Learn More$1,060.20 - Acetic Acid 56% W/W, 500ML, Poly BottleSKU: LC103101-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2790 (1 per EA)Learn Morewas $89.10 Special Price $66.83
- Barium Chloride, 20% w/v, 4.00 L Poly naturalSKU: CB100500-4A-EAManufacturer: Reagents IncBarium Chloride, 20% w/v, 4.00 L Poly natural (1 per EA )Learn Morewas $160.00 Special Price $119.88
- Chromic Acid, 5% w/v, 20.00 L Winpak blueSKU: CC119500-20E7-EAManufacturer: Reagents IncChromic Acid, 5% w/v, 20.00 L Winpak blue (1 per EA )Learn Morewas $573.00 Special Price $429.84
- Sodium Hydroxide, 12.5N, 1L, Poly BottleSKU: LC245252-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $111.30 Special Price $85.62
- Potassium Dichromate, 0.1N (0.0167M), 500ML, Poly BottleSKU: LC189801-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $33.70 Special Price $25.27
- Phosphoric Acid CP 85% w/w, 500.00 mL Glass amberSKU: C5102000-500C-EAManufacturer: Reagents IncPhosphoric Acid CP 85% w/w, 500.00 mL Glass amber (1 per EA )Learn Morewas $60.50 Special Price $45.36
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Nitric Acid, 6.0N (6.0M), 1L, Amber GlassSKU: LC178702-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2031 (1 per EA)Learn Morewas $140.40 Special Price $105.30 -
Mercuric Acetate TS, USP Test Solution, 500mL, CAS# 546-93-0SKU: M-444-1LT-EAManufacturer: Spectrum ChemicalMercuric Acetate TS, USP 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 More$429.45 - Perchloric Acid, 0.1N (0.1M) In Glacial Acetic Acid, 4L, Amber GlassSKU: LC181004-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2789 (1 per EA)Learn Morewas $271.00 Special Price $203.25
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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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