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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Potassium tert-Butoxide Solution, 1 M in Tetrahydrofuran, 100mL, CAS# 865-47-4SKU: P2153-100ML-EAManufacturer: Spectrum ChemicalPotassium tert-Butoxide Solution, 1 M in Tetrahydrofuran - Spectrum solutions utilize the highest quality raw materials appropriate to your product. Most raw materials meet or exceed the specifications established by the American Chemical Society. Where appropriate, many finished products are traceable to NIST Standard Reference Materials. Manufacturing, quality control testing, and packaging are all performed in Spectrum’s own facilities. Record keeping and sample retention of all produced lots ensure product consistency and complete traceability. (1 per EA )Learn More$492.35 -
Murakami Reagent (Etchant), 500.00 mL Poly naturalSKU: CM140000-500A-EAManufacturer: Reagents IncMurakami Reagent (Etchant), 500.00 mL Poly natural (1 per EA )Learn Morewas $117.00 Special Price $87.48 -
Sodium Hydroxide, 3.0N (3.0M), 4L, Poly BottleSKU: LC244204-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $120.60 Special Price $92.78 -
Formaldehyde, 37 Percent, Solution, 500mL, CAS# 50-00-0SKU: F3328-500ML-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 $241.65 Special Price $178.75 -
Red-Four(TM) Buffer Solution, pH 4.01 +/- 0.01 @ 25 DEG C, Color-coded RED, Reference StandardSKU: B1163-500MLPL-CSManufacturer: Spectrum ChemicalRed-Four (TM) Buffer Solution, pH 4.01 +/- 0.01 @ 25 DEG C, Color-coded RED, Reference Standard (6 per CS )Learn Morewas $243.10 Special Price $197.80 - Nitric Acid, 30% w/w, 2.50 L Glass clearSKU: CN104600-2.5D1-EAManufacturer: Reagents IncNitric Acid, 30% w/w, 2.50 L Glass clear (1 per EA )Learn Morewas $122.00 Special Price $91.80
- Sodium Citrate, 50% w/v, 1.00 L Poly naturalSKU: CS005000-1A-EAManufacturer: Reagents IncSodium Citrate, 50% w/v, 1.00 L Poly natural (1 per EA )Learn Morewas $45.50 Special Price $34.56
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Sodium Hydroxide, 3.0N (3.0M), 10L, Cubitainer®SKU: LC244206-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $251.60 Special Price $193.56 -
Acetic Acid 10% V/V (1+9), 1L, Poly BottleSKU: LC101902-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2790 (1 per EA)Learn Morewas $50.90 Special Price $38.18 -
Sodium Hydroxide, 0.3125N (0.3125M), 20L, Cubitainer®SKU: LC243055-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $228.20 Special Price $175.56 - Sulfuric Acid, 0.02 N, 1.00 L Poly naturalSKU: C7305400-1A-EAManufacturer: Reagents IncSulfuric Acid, 0.02 N, 1.00 L Poly natural (1 per EA )Learn Morewas $38.50 Special Price $29.16
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Amino-NapHthol-Sulfonic Acid For pHospHorus, 125ML, White PolySKU: LC108607-EAManufacturer: LabChemShelf Life (months): 2, , UN Number: (1 per EA)Learn Morewas $36.80 Special Price $27.60 -
Potassium Permanganate, 1% w/v Solution, 100 mL, Glass w/ DropperSKU: P1010-100mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsPotassium Permanganate, 1% w/v Solution, 100 mL, Glass w/ Dropper (1 per EA)Learn More$17.70 - Sodium Hydroxide 1% W/V, 20L, Cubitainer®SKU: LC240005-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $232.20 Special Price $178.63
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1L Red Buffer Solution pH 4.0 @ 25°C, Poly BottleSKU: MSIB2283-1L-EAManufacturer: Midland Scientific1L Red Buffer Solution pH 4.0 @ 25°C, Poly Bottle (1 per EA )Learn Morewas $21.75 Special Price $18.28 - Formaldehyde, 16% w/v, pH 8.3, 4.00 L CubitainerSKU: CF009000-4F-EAManufacturer: Reagents IncFormaldehyde, 16% w/v, pH 8.3, 4.00 L Cubitainer (1 per EA )Learn Morewas $233.00 Special Price $174.96
- Ammonium Hydroxide 5% w/w NH3, 200.00 L DrumSKU: CA011600-200E-EAManufacturer: Reagents IncAmmonium Hydroxide 5% w/w NH3, 200.00 L Drum (1 per EA )Learn Morewas $623.00 Special Price $467.64
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Amino-NapHthol-Sulfonic Acid For Silica, 500ML, Amber PolySKU: LC108901-EAManufacturer: LabChemShelf Life (months): 4, , UN Number: (1 per EA)Learn Morewas $58.00 Special Price $43.50 -
Sodium Hydroxide, 5 N Aqueous Solution, 4L, CAS# 1310-73-2SKU: S-390-4LT-CSManufacturer: Spectrum ChemicalSodium Hydroxide, 5 N Aqueous 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. (4 per CS )Learn Morewas $691.40 Special Price $562.59 -
Potassium Hydroxide 45% W/W, 20L, Poly DrumSKU: LC192505-EAManufacturer: LabChemShelf Life (months): , Traceable to NIST, UN Number: UN1814 (1 per EA)Learn Morewas $706.50 Special Price $529.88 -
Ceric Ammonium Nitrate TS - 100mLSKU: TS14070-100ml-EAManufacturer: Dawn ScientificCeric Ammonium Nitrate TS - 100mL (1 per EA )Learn Morewas $64.62 Special Price $63.01 -
Formaldehyde-Sodium Carbonate Solution, 500ML, Poly BottleSKU: LC146801-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $51.90 Special Price $38.92 -
Free Polymer Reagent #1, 2 ozSKU: R-0830-C-EAManufacturer: Taylor TechnologiesFree Polymer Reagent #1, 2 oz (1 per EA)Learn Morewas $46.78 Special Price $35.74 -
Sulfuric Acid 1.28N, 32 ozSKU: R-0655S-1-F-EAManufacturer: Taylor TechnologiesSulfuric Acid 1.28N, 32 oz (1 per EA )Learn Morewas $57.61 Special Price $51.54
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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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