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 Dichromate TS - 100mLSKU: TS14216-100ml-EAManufacturer: Dawn ScientificPotassium Dichromate TS - 100mL (1 per EA )Learn Morewas $49.62 Special Price $48.38 - Hydroxylamine Hydrochloride TS - 500mLSKU: TS14126-500ml-EAManufacturer: Dawn ScientificHydroxylamine Hydrochloride TS - 500mL (1 per EA )Learn Morewas $129.62 Special Price $126.38
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Bromocresol Purple, Sodium Salt, 10G, Amber GlassSKU: LC118857-EAManufacturer: LabChemShelf Life (months): , , UN Number: (1 per EA)Learn Morewas $110.20 Special Price $82.65 -
Sodium Hydroxide, 0.02N (0.02M), 1L, Poly BottleSKU: LC242202-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $38.10 Special Price $28.58 -
Sodium Chloride, 0.85% w/v Solution, 1 LSKU: S1017-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsNon-Sterile Saline, No Anti-Microbial Agents Added (1 per EA)Learn More$18.45 -
Vario Silica Hr Citric Acid Reagent, F25 1000 Pack, Ea/1SKU: 531943-EAManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 1454828. (1 per EA )Learn More$310.44 -
EDTA Titrant, 0.1 M with Mg, 1.00 L Poly naturalSKU: CE250200-1A-EAManufacturer: Reagents IncEDTA Titrant, 0.1 M with Mg, 1.00 L Poly natural (1 per EA )Learn Morewas $51.00 Special Price $37.80 - Potassium Iodide, 2.5 N, 1.00 L Poly naturalSKU: CP002500-1A-EAManufacturer: Reagents IncPotassium Iodide, 2.5 N, 1.00 L Poly natural (1 per EA )Learn Morewas $226.00 Special Price $169.56
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Sodium Hydroxide, SVS Concentrate, To Prepare 1.0 N Solution, 1UNIT, CAS# 1310-73-2SKU: SV255-1UNIT-EAManufacturer: Spectrum ChemicalSodium Hydroxide, SVS Concentrate, To Prepare 1.0 N Solution - Spectrum's Standard Volumetric Solution (SVS) concentrate when diluted to 1 liter will yield a 1.0 N solution. Simply dilute the desired Standard Volumetric Solution concentrate to the specified volume (carefully following instructions provided with the package) and the resulting solution will have an exact Normality within 0.1%. Spectrum Standard Volumetric Solution concentrates are relied upon for fast, accurate results in life sciences and pharmaceutical quality control applications. (1 per EA )Learn More$109.45 - Sodium Chromate Indicator, 500.00 mL Poly naturalSKU: CS102900-500A-EAManufacturer: Reagents IncSodium Chromate Indicator, 500.00 mL Poly natural (1 per EA )Learn Morewas $197.00 Special Price $147.96
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Hydrochloric Acid, 0.25N (0.25M), 4L, Poly BottleSKU: LC152504-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1789 (1 per EA)Learn Morewas $90.00 Special Price $67.50 - Ammonium Hydroxide, 1.0N (1.0M), 1L, Poly BottleSKU: LC110802-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $79.80 Special Price $59.85
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Ferric Chloride, 41 DEG Be Solution, 4L, CAS# 7705-08-0SKU: F1025-4LTPL-EAManufacturer: Spectrum ChemicalFerric Chloride, 41 DEG Be 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 $280.35 Special Price $165.91 - Sodium Hydroxide, 0.1 N, 500.00 mL Poly naturalSKU: C7318000-500A-EAManufacturer: Reagents IncSodium Hydroxide, 0.1 N, 500.00 mL Poly natural (1 per EA )Learn Morewas $24.00 Special Price $18.36
- Hydrochloric Acid 20% V/V (1+4), 1L, Poly BottleSKU: LC150902-EAManufacturer: LabChemShelf Life (months): 36, Traceable to NIST, UN Number: UN1789 (1 per EA)Learn Morewas $67.00 Special Price $50.25
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Buffer Solution pH 10.0, 16 ozSKU: R-1099-10-E-EAManufacturer: Taylor TechnologiesBuffer Solution pH 10.0, 16 oz (1 per EA)Learn Morewas $16.56 Special Price $12.65 - Magnesium Chloride 51% W/V, 4L, Poly BottleSKU: LC163904-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $519.20 Special Price $389.40
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Sulfuric Acid, 0.2 N Solution, 4L, CAS# 7664-93-9SKU: S-620-4LT-EAManufacturer: Spectrum ChemicalSulfuric Acid, 0.2 N Solution - Spectrum utilizes 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 Morewas $88.50 Special Price $72.00 - Sudan III Solution, 1% w/v in 70% Denatured Ethanol, 3.8 LSKU: S1049-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsFat Stain (1 per EA)Learn More$81.10
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SSPE Buffer 20X Solution pH 7.4, 1 LiterSKU: S24100-1000.0-EAManufacturer: Research Products InternationalDimensions: 3.50 x 8.50 x 3.50 Weight: 2.4 - Research or further manufacturing use only, not for food or drug use. (1 per EA)Learn More$85.15 - Buffer Solution For Fluoride, 1L, Poly BottleSKU: LC125802-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $105.70 Special Price $79.27
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Ceric Ammonium Sulfate, 0.1N (0.1M), 20L, Cubitainer®SKU: LC129305-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2796 (1 per EA)Learn Morewas $1,082.30 Special Price $811.73 -
Ferroin Indicator, 0.025M, SolutionSKU: F-157-500MLGL-EAManufacturer: Spectrum ChemicalFerroin Indicator, 0.025M, Solution is most often used as an indicator in analytical chemistry and as an oxidation-reduction indicator solution used in determination of Chemical Oxidation Demand (COD) by ferrous titration. 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 $452.40 Special Price $401.59 - Sodium Hydroxide, 6 Normal, 1 L, PolySKU: S1085-1L-EAManufacturer: 710 Spirits Rocky Mtn Reagents6 M (1 per EA)Learn More$30.15
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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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