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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Vario Silica Hr Reagent Set, F25 100 Tests, Ea/1SKU: 535900-EAManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 2244300. Lovibond Vario Silica HR Reagent Set, F25, 100 Tests Silica Ultra HR Reagent Set, 25 ml (1 per EA)Learn More$155.50 -
Potassium Hydroxide 20% W/V, 1L, Poly BottleSKU: LC192202-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1814 (1 per EA)Learn Morewas $69.70 Special Price $52.27 -
pHospHoric Acid 10% V/V, 500ML, Poly BottleSKU: LC186501-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1805 (1 per EA)Learn Morewas $44.40 Special Price $33.30 -
Long Range Indicator, 2 oz, Dropper BottleSKU: R-1003U-C-DB-EAManufacturer: Taylor TechnologiesLong Range Indicator, 2 oz, Dropper Bottle (1 per EA)Learn Morewas $15.34 Special Price $11.72 -
Potassium Iodide, 20 Percent (w/v) Aqueous Solution, 1L, CAS# 7681-11-0SKU: P-433-1LT-EAManufacturer: Spectrum ChemicalPotassium Iodide, 20 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 $178.95 Special Price $145.61 -
Sodium Hydroxide, 12.5N, 4L, Poly BottleSKU: LC245254-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $177.10 Special Price $136.24 -
Alkaline Oleic Acid Solution, 10.00 L CubitainerSKU: CA208400-10F-EAManufacturer: Reagents IncAlkaline Oleic Acid Solution, 10.00 L Cubitainer (1 per EA )Learn Morewas $340.00 Special Price $254.88 -
Color Reagent-Chloride, 4L, Amber GlassSKU: LC132604-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $320.60 Special Price $240.45 - Acetic Acid, 2.0N (2.0M), 1L, Poly BottleSKU: LC103902-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2790 (1 per EA)Learn Morewas $54.80 Special Price $41.10
- Acetic Acid, 1.0N (1.0M), 1L, Poly BottleSKU: LC103802-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $52.00 Special Price $39.00
- Sodium Chloride, 1.0N (1.0M), 1L, Poly BottleSKU: LC235802-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $74.80 Special Price $57.54
- Sodium Potassium Tartrate 30% W/V, 500ML, Poly BottleSKU: LC248301-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $80.10 Special Price $61.62
- Sulfuric Acid 70% w/w Textile, 1.00 L Poly naturalSKU: C7306600-1A-EAManufacturer: Reagents IncSulfuric Acid 70% w/w Textile, 1.00 L Poly natural (1 per EA )Learn Morewas $42.00 Special Price $31.32
- Potassium Bromide 10% W/V, 4L, Poly BottleSKU: LC187824-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $244.40 Special Price $183.30
- Buffer Solution pH 6.86, 500ML, Poly BottleSKU: LC123501-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $37.10 Special Price $27.82
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Sodium Silicate, 36.9% to 38.1%, TechnicalSKU: S1136-5gal-EAManufacturer: 710 Spirits Rocky Mtn Reagents41 Baume; Type N (1 per EA)Learn More$91.75 -
Hydrochloric Acid, 1.0 N Aqueous Solution, 4L, CAS# 7647-01-0SKU: H-135-4LTPL-CSManufacturer: Spectrum ChemicalHydrochloric Acid, 1.0 N Aqueous Solution, is a colorless and clear, highly corrosive, highly pungent solution of hydrogen chloride in water. As an monoprotic acid and one of the six common strong mineral acids it is the least likely to be subject to an oxidation-reduction reaction. Hydrochloric acid is also frequently used during chemical analysis to prepare samples for analysis. It reacts with basic compounds, turning them into dissolved chlorides that can then undergo analysis. (4 per CS )Learn Morewas $356.15 Special Price $289.80 - Acetic Acid 30% V/V (3+7), 1L, Poly BottleSKU: LC102602-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2790 (1 per EA)Learn Morewas $53.00 Special Price $39.75
- Borate Buffer, 500ML, Poly BottleSKU: LC117001-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $56.10 Special Price $42.08
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Sodium Hypochlorite, 5 Percent Available Chlorine, Solution, Reagent, 500mL, CAS# 7681-52-9SKU: S1315-500MLPL-CSManufacturer: Spectrum ChemicalSodium Hypochlorite, 5 Percent Available Chlorine, Solution, Reagent - The Reagent grade denotes that this chemical is the highest quality commercially available and that the American Chemical Society has not officially set any specifications for this material. Spectrum Chemical manufactured Reagent grade products meet the toughest regulatory standards for quality and purity. (6 per CS )Learn Morewas $491.15 Special Price $290.65 - Hydrochloric Acid, 3.85N (3.85M), 4L, Poly BottleSKU: LC153454-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1789 (1 per EA)Learn Morewas $163.40 Special Price $122.55
- Potassium Hydroxide 10% W/V, 4L, Poly BottleSKU: LC192004-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1814 (1 per EA)Learn Morewas $122.40 Special Price $91.80
- Hydrochloric Acid, 0.1N (0.1M) In Ipa, 4L, Poly BottleSKU: LC154004-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1993 (1 per EA)Learn Morewas $196.20 Special Price $147.15
- Ammonium Oxalate 4% W/V, 500ML, Poly BottleSKU: LC112801-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $58.20 Special Price $43.65
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LPS 200uL Universal Pipet Tips, Yellow, Bulk, PK1000
was $20.00 Special Price $15.75
4L Yellow Buffer Solution pH 7.0 @ 25°C, Poly Bottle
was $74.64 Special Price $21.46
BEAD BATH 20 L, 120 V, TYPE B PLUG, Liters/EA: 20
was $1,794.65 Special Price $1,714.78
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