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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Nitric Acid 50% V/V, 500ML, Amber GlassSKU: LC177701-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2031 (1 per EA)Learn Morewas $91.30 Special Price $68.47 -
Buffer Solution pH 5.0, 1L, Poly BottleSKU: LC123002-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $61.50 Special Price $46.13 -
Doctor Solution, 4L, Poly BottleSKU: LC136904-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $172.50 Special Price $129.37 -
Sulfuric Acid, 1.0N (0.5M), 10L, Cubitainer®SKU: LC257706-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2796 (1 per EA)Learn Morewas $154.70 Special Price $116.02 -
Acetic Acid, 80% v/v, 4.00 L Poly naturalSKU: CA101400-4A-EAManufacturer: Reagents IncAcetic Acid, 80% v/v, 4.00 L Poly natural (1 per EA )Learn Morewas $174.00 Special Price $130.68 -
Benzene, Reagent, ACS, 125mL, CAS# 71-43-2SKU: B1070-125ML-EAManufacturer: Spectrum ChemicalBenzene, Reagent, ACS is an organic compound that is naturally found in crude oil. This colorless and highly flammable liquid is an important part of gasoline due to its high octane number. In the laboratory, benzene is used mainly as a solvent. As an ACS grade reagent, Spectrum Chemical manufactured compound is used as the quality standard against which other substances are grade and has met the toughest regulatory standards for quality and pureness. (1 per EA )Learn More$188.42 - Hydrochloric Acid, 1.0N (1.0M), 10L, Cubitainer®SKU: LC153006-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1789 (1 per EA)Learn Morewas $164.90 Special Price $123.67
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pHospHoric Acid-Sulfamic Acid Solution, 500ML, Poly BottleSKU: LC186601-EAManufacturer: LabChemShelf Life (months): 12, , UN Number: UN1805 (1 per EA)Learn Morewas $76.20 Special Price $57.15 - Sulfuric Acid, 2 N, 20.00 L CubitainerSKU: CS106300-20F-EAManufacturer: Reagents IncSulfuric Acid, 2 N, 20.00 L Cubitainer (1 per EA )Learn Morewas $156.00 Special Price $116.64
- Sodium Thiosulfate, 1.0N (1.0M), 4L, Poly BottleSKU: LC251004-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $157.20 Special Price $120.93
- Potassium Hydroxide 20% W/V, 4L, Poly BottleSKU: LC192204-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1814 (1 per EA)Learn Morewas $176.40 Special Price $132.30
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Barium Chloride Solution 20%, 16 ozSKU: R-0711-E-EAManufacturer: Taylor TechnologiesBarium Chloride Solution 20%, 16 oz (1 per EA)Learn Morewas $35.26 Special Price $26.93 - Fehling's Copper Solution A, 1.00 L Poly naturalSKU: C7202000-1A-EAManufacturer: Reagents IncFehling's Copper Solution A, 1.00 L Poly natural (1 per EA )Learn Morewas $46.50 Special Price $34.56
- Fehling's Alkaline Solution B, 500.00 mL Poly naturalSKU: C7202500-500A-EAManufacturer: Reagents IncFehling's Alkaline Solution B, 500.00 mL Poly natural (1 per EA )Learn Morewas $46.50 Special Price $34.56
- Potassium Iodate-Iodide, 0.0125N (0.002083M), 4L, Amber PolySKU: LC196604-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $139.50 Special Price $104.63
- Hydrochloric Acid 25% V/V (1+3), 4L, Poly BottleSKU: LC151004-EAManufacturer: LabChemShelf Life (months): 36, Traceable to NIST, UN Number: UN1789 (1 per EA)Learn Morewas $187.30 Special Price $140.48
- 11-13 Indicator, 1.00 L Glass amberSKU: CI001200-1C-EAManufacturer: Reagents Inc11-13 Indicator, 1.00 L Glass amber (1 per EA )Learn Morewas $123.00 Special Price $91.80
- Hydrochloric Acid, 0.125 N, 500.00 mL Poly naturalSKU: CH122100-500A-EAManufacturer: Reagents IncHydrochloric Acid, 0.125 N, 500.00 mL Poly natural (1 per EA )Learn Morewas $40.00 Special Price $30.24
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Hardness Reagent (1 drop = 10 ppm hardness as CaCO₃), 16 ozSKU: R-0683-E-EAManufacturer: Taylor TechnologiesHardness Reagent (1 drop = 10 ppm hardness as CaCO₃), 16 oz (1 per EA)Learn Morewas $34.36 Special Price $26.25 - Potassium Fluoride, 20% w/w, 1.00 L Poly naturalSKU: CP103900-1A-EAManufacturer: Reagents IncPotassium Fluoride, 20% w/w, 1.00 L Poly natural (1 per EA )Learn Morewas $116.00 Special Price $87.48
- Hydrogen Peroxide 30% W/W, 500ML, Poly BottleSKU: LC154301-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2014 (1 per EA)Learn Morewas $147.40 Special Price $110.55
- Methanol/Dichloromethane 20/80, 1.00 L Glass amberSKU: CM108500-1C-EAManufacturer: Reagents IncMethanol/Dichloromethane 20/80, 1.00 L Glass amber (1 per EA )Learn Morewas $114.00 Special Price $85.32
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Potassium Permanganate, 0.2N (0.04M), 4L, Amber GlassSKU: LC200004-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $117.80 Special Price $88.35 -
HydroxynapHthol Blue, 100G, Poly BottleSKU: LC155707-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $132.10 Special Price $99.08
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