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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Sodium Acetate, 30% w/w Solution, Technical, 55 gal, PolySKU: S1175-55gal-EAManufacturer: 710 Spirits Rocky Mtn ReagentsSodium Acetate, 30% w/w Solution, Technical, 55 gal, Poly (1 per EA )Learn More$1,268.20 -
Sodium Hydroxide, 0.25N (0.25M), 20L, Cubitainer®SKU: LC243005-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $222.60 Special Price $171.25 - Cupric Chloride, 5.3% w/v in 20% v/v Acetic Acid, 3.8 L, PolySKU: C1031-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsCupric Chloride, 5.3% w/v in 20% v/v Acetic Acid, 3.8 L, Poly (1 per EA)Learn More$54.30
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Phenolphthalein, 1 Percent (w/v) Indicator Solution in 95 Percent Isopropyl AlcoholSKU: P-155-4LTPL-EAManufacturer: Spectrum ChemicalPhenolphthalein, 1 Percent (w/v) Indicator Solution in 95 Percent Isopropyl Alcohol is often used as a indicator in titrations and is colorless in acidic solutions and pink in basic solutions. 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 $282.65 Special Price $250.91 -
Potassium Iodide, 10 Percent (w/v) Aqueous Solution, 500mL, CAS# 7681-11-0SKU: P-432-500MLGL-EAManufacturer: Spectrum ChemicalPotassium Iodide, 10 Percent (w/v) Aqueous Solution is refered to by the chemical formula KI and is an inorganic compound. Used as a component in film photography before the discovery of silver iodide, it is also used in the electrolyte of dye sensitized solar cells. KI is also used as an emergency blockade of radio-iodine, a common form of radiation poisoning. (1 per EA )Learn Morewas $80.45 Special Price $65.47 -
Azodicarbonamide, 100g, CAS# 123-77-3SKU: A1587-100GM-EAManufacturer: Spectrum ChemicalAzodicarbonamide, also known as azo(bis)formamide or Diazenedicarboxamide, is a chemical compound used as a food additive, a flour bleaching agent, and a dough conditioner. 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 More$174.00 -
Butyl Carbitol™, 25% w/w, 1.00 L Glass amberSKU: CB003200-1C-EAManufacturer: Reagents IncButyl Carbitol™, 25% w/w, 1.00 L Glass amber (1 per EA )Learn Morewas $93.00 Special Price $70.20 -
Potassium Hydroxide, 1.0N (1.0M) In Methanol, 1L, Poly BottleSKU: LC195402-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: UN2924 (1 per EA)Learn Morewas $81.30 Special Price $60.98 - pHospHoric Acid 25% V/V, 1L, Poly BottleSKU: LC186552-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1805 (1 per EA)Learn Morewas $77.30 Special Price $57.97
- Tucker's Solution (Modified), 4.00 L Poly naturalSKU: CT013500-4A-EAManufacturer: Reagents IncTucker's Solution (Modified), 4.00 L Poly natural (1 per EA )Learn Morewas $277.00 Special Price $213.10
- Sodium Hydroxide, 1.0N (1.0M), 20L, Cubitainer®SKU: LC243505-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $204.00 Special Price $156.94
- Sulfuric Acid, 0.255N (0.1275M), 20L, Cubitainer®SKU: LC257305-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2796 (1 per EA)Learn Morewas $219.70 Special Price $169.02
- Sodium Thiosulfate, Saturated, 4.00 L Poly naturalSKU: CS127300-4A-EAManufacturer: Reagents IncSodium Thiosulfate, Saturated, 4.00 L Poly natural (1 per EA )Learn Morewas $80.00 Special Price $60.48
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Sulfuric Acid 50%, 16 (GL)SKU: R-0729-E-EAManufacturer: Taylor TechnologiesSulfuric Acid 50%, 16 (GL) (1 per EA)Learn Morewas $55.21 Special Price $42.18 -
Ammonium Hydroxide, 50 Percent (v/v) Solution, 1L, CAS# 1336-21-6SKU: A-160-1LT-EAManufacturer: Spectrum ChemicalAmmonium Hydroxide, 50 Percent (v/v) 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 $102.10 Special Price $83.07 -
Starch Indicator 0.5%, 4L, Poly BottleSKU: LC253004-EAManufacturer: LabChemShelf Life (months): 12, , UN Number: (1 per EA)Learn Morewas $95.60 Special Price $73.55 -
Alkaline Iodide Azide-1, 500ML, Amber PolySKU: LC106701-EAManufacturer: LabChemShelf Life (months): 36, , UN Number: UN1824 (1 per EA)Learn Morewas $88.20 Special Price $66.15 -
Phosphonate Titrating Solution (for buret titrations), 16 ozSKU: R-0880-E-EAManufacturer: Taylor TechnologiesPhosphonate Titrating Solution (for buret titrations), 16 oz (1 per EA )Learn Morewas $44.86 Special Price $40.13 - Sodium Citrate 30% W/V, 1L, Poly BottleSKU: LC236602-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $273.50 Special Price $210.41
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Mercuric Sulfate TS (Denig`es' Reagent) - 100mLSKU: TS14162-100ml-EAManufacturer: Dawn ScientificMercuric Sulfate TS (Denig`es' Reagent) - 100mL (1 per EA )Learn Morewas $79.62 Special Price $77.63 - Nitric Acid, 1% v/v, 2.50 L Glass clearSKU: CN103300-2.5D1-EAManufacturer: Reagents IncNitric Acid, 1% v/v, 2.50 L Glass clear (1 per EA )Learn Morewas $61.00 Special Price $45.36
- Starch Indicator 0.5%, 20L, Cubitainer®SKU: LC253005-EAManufacturer: LabChemShelf Life (months): 12, , UN Number: (1 per EA)Learn Morewas $354.00 Special Price $272.34
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Sulfanilamide 1% W/V, 1L, Amber PolySKU: LC254502-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: UN1789 (1 per EA)Learn Morewas $118.60 Special Price $91.24 -
Ferric Chloride Solution, 125ML, Poly BottleSKU: LC143807-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: UN2582 (1 per EA)Learn Morewas $84.60 Special Price $63.45
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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
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
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