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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Silver-Ammonium Nitrate TS - 100mLSKU: TS14239-100ml-EAManufacturer: Dawn ScientificSilver-Ammonium Nitrate TS - 100mL (1 per EA )Learn Morewas $59.62 Special Price $58.13 -
Aluminum Chloride, 0.1 M Solution, 1L, CAS# 60142-96-3SKU: A-455-1LT-EAManufacturer: Spectrum ChemicalAluminum Chloride, 0.1 M Solution in its pure form is a white and granular solid. Often cited as a Lewis acid this inorganic compound is a good example of a compound that cracks at mild temperature, reversing from a polymer to a monomer. It is often used as a component of antiperspirant in low doses. (1 per EA )Learn Morewas $449.50 Special Price $365.75 -
Diluting Fluid For Sperm, 500ML, Poly BottleSKU: LC135871-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $67.10 Special Price $50.33 -
Diluted Hydrochloric Acid, 10 Percent (w/v), NF, 500mL, CAS# 7647-01-0SKU: HY105-500MLGL-CSManufacturer: 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). (6 per CS )Learn Morewas $846.60 Special Price $626.25 -
Laemmli Buffer Reducing, 4X Solution, 50 MillilitersSKU: L18200-50.0-EAManufacturer: Research Products InternationalDimensions: 3.38 x 4.63 x 3.38 Weight: 0.17 - Research or further manufacturing use only, not for food or drug use. (1 per EA)Learn More$96.50 -
Sodium Hydroxide, 10% w/v Solution, 500 mLSKU: S1009-500mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsCaustic Soda (1 per EA)Learn More$19.05 -
Sulfuric Acid, 0.5N (0.25M), 1L, Poly BottleSKU: LC257402-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2796 (1 per EA)Learn Morewas $34.80 Special Price $26.78 - Sodium Hydroxide, 0.5N (0.5M), 500ML, Poly BottleSKU: LC243301-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $30.30 Special Price $23.31
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Ferroin Indicator, 16 ozSKU: R-0819-E-EAManufacturer: Taylor TechnologiesFerroin Indicator, 16 oz (1 per EA)Learn Morewas $87.04 Special Price $66.49 - Sodium Sulfite 2.5% W/V, 1L, Poly BottleSKU: LC249352-EAManufacturer: LabChemShelf Life (months): 12, , UN Number: (1 per EA)Learn Morewas $57.40 Special Price $44.16
- Hydrochloric Acid, 50% v/v Solution, 1 LSKU: H1016-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsHydrochloric Acid, 50% v/v Solution, 1 L (1 per EA)Learn More$32.40
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Hydrochloric Acid, 0.1N (0.1M), 4L, Poly BottleSKU: LC152204-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $74.60 Special Price $55.95 - Hydrogen Peroxide, 20% w/w, Technical, 5 gal, CubitainerSKU: H1025-5gal-EAManufacturer: 710 Spirits Rocky Mtn ReagentsHydrogen Peroxide, 20% w/w, Technical, 5 gal, Cubitainer (1 per EA )Learn More$77.90
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Potassium Permanganate, 0.042N, 500.00 mL Amber polySKU: CP241000-500B-EAManufacturer: Reagents IncPotassium Permanganate, 0.042N, 500.00 mL Amber poly (1 per EA )Learn Morewas $36.00 Special Price $27.00 - Arsenazo III, 0.05% Aqueous, 1.00 L Glass amberSKU: C8302900-1C-EAManufacturer: Reagents IncArsenazo III, 0.05% Aqueous, 1.00 L Glass amber (1 per EA )Learn Morewas $267.00 Special Price $199.80
- Guaiacol, 0.5% w/v in Denatured Ethanol, 1 L,SKU: G1018-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsGuaiacol, 0.5% w/v in Denatured Ethanol, 1 L, (1 per EA )Learn More$48.65
- Sodium Hydroxide, 5.0N (5.0M), 500ML, Poly BottleSKU: LC244501-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $38.80 Special Price $29.85
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Iodine, 0.1N (0.05M), 4L, Amber GlassSKU: LC156604-EAManufacturer: LabChemShelf Life (months): 18, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $231.10 Special Price $173.33 - Mercuric Chloride 5% W/V, 500ML, Poly BottleSKU: LC166001-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: UN2024 (1 per EA)Learn Morewas $147.50 Special Price $110.62
- Formic Acid, 10% w/w, 1.00 L Poly naturalSKU: CF001000-1A-EAManufacturer: Reagents IncFormic Acid, 10% w/w, 1.00 L Poly natural (1 per EA )Learn Morewas $43.50 Special Price $32.40
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Hardness Reagent B, .25 lbSKU: R-0615-J-EAManufacturer: Taylor TechnologiesHardness Reagent B, .25 lb (1 per EA)Learn Morewas $97.87 Special Price $74.76 - Phosphoric Acid, 25% v/v Solution, 3.8 LSKU: P1054-3.8L-EAManufacturer: 710 Spirits Rocky Mtn Reagentso-Phosphoric Acid; White Phosphoric Acid (1 per EA)Learn More$103.60
- Sodium Hypobromite, 0.1 N, 1.00 L Glass amberSKU: CS126200-1C-EAManufacturer: Reagents IncSodium Hypobromite, 0.1 N, 1.00 L Glass amber (1 per EA )Learn Morewas $142.00 Special Price $106.92
- Acid Stannous Chloride TS, Stronger - 500mLSKU: TS14009-500ml-EAManufacturer: Dawn ScientificAcid Stannous Chloride TS, Stronger - 500mL (1 per EA )Learn Morewas $139.62 Special Price $136.13
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