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 Permanganate, 1% w/v Solution, 3.8 L, Poly GallonSKU: P1010-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsPotassium Permanganate, 1% w/v Solution, 3.8 L, Poly Gallon (1 per EA)Learn More$43.35 - Potassium Iodide, 0.1 Normal, 1 L, Amber GlassSKU: P1021-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsN/10 (0.1 M); Potide (1 per EA)Learn More$29.30
- Potassium Hydroxide, 0.1 Normal, 3.8 L, Poly GallonSKU: P1041-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsN/10 (0.1 M) (1 per EA)Learn More$40.75
- Sodium Chromate, 10% w/v Solution, 120 mL, Poly w/ FliptopSKU: S1022-120mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsChromic Acid, Disodium Salt, Tetrahydrate (1 per EA)Learn More$29.10
- Sulfuric Acid, 25% v/v Solution, 3.8 LSKU: S1066-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsSulfuric Acid, 25% v/v Solution, 3.8 L (1 per EA)Learn More$51.85
- Sodium Hydroxide, 0.01 Normal, 3.8 L, Poly GallonSKU: S1081-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsN/100 (0.01 M) (1 per EA)Learn More$35.70
- Sulfuric Acid, 0.5 Normal, 1 L, PolySKU: S1088-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsN/2 (0.25 M) (1 per EA)Learn More$20.50
- Sulfuric Acid, 5% v/v Solution, 1 LSKU: S1116-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsSulfuric Acid, 5% v/v Solution, 1 L (1 per EA)Learn More$19.15
- Bromothymol Blue/Bromocresol Purple, 0.1% w/v Solution, 500 mLSKU: B1030-500mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentspH 6.7 Midpoint (1 per EA)Learn More$76.20
- Potassium Chromate, 10% w/v Solution, 3.8 L, Poly GallonSKU: P1036-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsPotassium Chromate, 10% w/v Solution, 3.8 L, Poly Gallon (1 per EA)Learn More$133.50
- PAN, 0.1% w/v in Denatured Ethanol, 500 mLSKU: P1062-500mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsPAN, 0.1% w/v in Denatured Ethanol, 500 mL (1 per EA)Learn More$60.15
- Sulfuric Acid for Babcock Test, 91.75% w/w Solution, 3.8 L, Poly GallonSKU: S1182-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsSulfuric Acid for Babcock Test, 91.75% w/w Solution, 3.8 L, Poly Gallon (1 per EA )Learn More$176.35
- Ammonium Chloride Hydroxide Buffer, pH 10.0, 55 galSKU: A1030-55gal-EAManufacturer: 710 Spirits Rocky Mtn ReagentsAmmonium Chloride Hydroxide Buffer, pH 10.0, 55 gal (1 per EA)Learn More$1,092.70
- Sodium Chromate, 10% w/v Solution, 3.8 L, Poly GallonSKU: S1022-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsChromic Acid, Disodium Salt, Tetrahydrate (1 per EA)Learn More$244.45
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Magnesium Chloride 2M Solution, Packaged 5 x 10 Milliliters, 50 Milliliters CAS# 7791-18-6; 7732-18-5SKU: M24500-50.0-EAManufacturer: Research Products InternationalMol. Wt:406.6 Common Name: Formula: MgCl2 6H2O Dimensions: 3.38 x 4.63 x 3.38, Weight: 0.17, Cas#: 7791-18-6; 7732-18-5 Research or further manufacturing use only, not for food or drug use. (1 per EA)Learn More$64.15 -
Silver Nitrate, 0.153N (0.153M), 1L, Amber GlassSKU: LC227152-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $373.20 Special Price $279.90 -
Buffer Solution For Fluoride, 4L, Poly BottleSKU: LC125804-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $161.10 Special Price $120.83 -
DipHenylcarbazide, ACS, 25G, Amber GlassSKU: LC136558-EAManufacturer: LabChemShelf Life (months): , , UN Number: (1 per EA)Learn Morewas $157.00 Special Price $117.75 -
Barium Chloride 12% W/V, 1L, Poly BottleSKU: LC116022-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $90.00 Special Price $67.50 -
pHenolpHthalein 0.5% In 50% Etoh, 125ML, Poly BottleSKU: LC182007-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: UN1170 (1 per EA)Learn Morewas $24.20 Special Price $18.15 - Acetic Acid 50% V/V (1+1), 1L, Poly BottleSKU: LC102902-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2790 (1 per EA)Learn Morewas $107.90 Special Price $80.92
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Potassium Iodide 20% W/V, 1L, Amber PolySKU: LC198002-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $208.30 Special Price $156.22 -
Buffer Solution pH 6.86, 10L, Cubitainer®SKU: LC123506-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $231.40 Special Price $173.55 -
Sodium Hydroxide, 0.01 N Aqueous Solution, 20L, CAS# 1310-73-2SKU: S-320-20LT-EAManufacturer: Spectrum ChemicalSodium Hydroxide, 0.01 N Aqueous Solution - 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 Morewas $183.85 Special Price $176.80
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