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 Iodide, 15% w/v, 20.00 L CubitainerSKU: C7286150-20F-EAManufacturer: Reagents IncPotassium Iodide, 15% w/v, 20.00 L Cubitainer (1 per EA )Learn Morewas $1,100.00 Special Price $825.12 - Sulfuric Acid, 25% v/v, 10.00 L CubitainerSKU: C7306100-10F-EAManufacturer: Reagents IncSulfuric Acid, 25% v/v, 10.00 L Cubitainer (1 per EA )Learn Morewas $234.00 Special Price $176.04
- Acetonitrile, 10%, Buffered, 1.00 L Glass amberSKU: CA108700-1C-EAManufacturer: Reagents IncAcetonitrile, 10%, Buffered, 1.00 L Glass amber (1 per EA )Learn Morewas $64.00 Special Price $47.52
- Sodium Thiosulfate, 0.0787 N, 4.00 L Glass amberSKU: CS137700-4C-EAManufacturer: Reagents IncSodium Thiosulfate, 0.0787 N, 4.00 L Glass amber (1 per EA )Learn Morewas $850.00 Special Price $637.20
- EDTA Titrant, 0.01 M, 20.00 L CubitainerSKU: CE250400-20F-EAManufacturer: Reagents IncEDTA Titrant, 0.01 M, 20.00 L Cubitainer (1 per EA )Learn Morewas $360.00 Special Price $270.00
- Sulfuric Acid, 0.417 N, 10.00 L CubitainerSKU: CS201300-10F-EAManufacturer: Reagents IncSulfuric Acid, 0.417 N, 10.00 L Cubitainer (1 per EA )Learn Morewas $149.00 Special Price $111.24
- Methanol, 15% v/v HPLC, 4.00 L Glass amberSKU: CM120700-4C-EAManufacturer: Reagents IncMethanol, 15% v/v HPLC, 4.00 L Glass amber (1 per EA )Learn Morewas $177.00 Special Price $132.84
- Sodium Hydroxide, 10% w/w, 10.00 L CubitainerSKU: CS130700-10F-EAManufacturer: Reagents IncSodium Hydroxide, 10% w/w, 10.00 L Cubitainer (1 per EA )Learn Morewas $238.00 Special Price $178.20
- Phenolphthalein, 0.5% /50% Alc, 1.00 L Poly naturalSKU: CP108800-1A-EAManufacturer: Reagents IncPhenolphthalein, 0.5% /50% Alc, 1.00 L Poly natural (1 per EA )Learn Morewas $109.00 Special Price $82.08
- EDTA Titrant, 0.05 M, 4.00 L Poly naturalSKU: CE253000-4A-EAManufacturer: Reagents IncEDTA Titrant, 0.05 M, 4.00 L Poly natural (1 per EA )Learn Morewas $139.00 Special Price $104.76
- Potassium Permanganate, 0.588N, 1.00 L Glass amberSKU: C7288530-1C-EAManufacturer: Reagents IncPotassium Permanganate, 0.588N, 1.00 L Glass amber (1 per EA )Learn Morewas $72.00 Special Price $54.00
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Crystal Violet TS - 500mLSKU: TS14080-500ml-EAManufacturer: Dawn ScientificCrystal Violet TS - 500mL (1 per EA )Learn Morewas $129.62 Special Price $126.38 - Ammonium Carbonate TS 2 - 100mLSKU: TS14035-100ml-EAManufacturer: Dawn ScientificAmmonium Carbonate TS 2 - 100mL (1 per EA )Learn Morewas $54.62 Special Price $53.25
- Sudan IV TS - 100mLSKU: TS14279-100ml-EAManufacturer: Dawn ScientificSudan IV TS - 100mL (1 per EA )Learn Morewas $59.62 Special Price $58.13
- Hydrochloric Acid 2.5 N, 1.00 L Poly naturalSKU: CH123500-1A-EAManufacturer: Reagents IncHydrochloric Acid 2.5 N, 1.00 L Poly natural (1 per EA )Learn Morewas $61.00 Special Price $45.36
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Buffer Solution, pH 1.68 +/- 0.02 @ 25 DEG C, Reference StandardSKU: B-220-20LTCU-EAManufacturer: Spectrum ChemicalBuffer Solution, pH 1.68 +/- 0.02 @ 25 DEG C, Reference Standard is an inorganic solution in water. 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 $782.55 Special Price $636.76 - Glutaric Dialdehyde, 50 Percent in Water, 18L, CAS# 111-30-8SKU: G3060-18LT-EAManufacturer: Spectrum ChemicalGlutaric Dialdehyde, 50 Percent in Water, 18L, CAS# 111-30-8 (1 per EA )Learn Morewas $2,076.55 Special Price $1,843.29
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500mL Blue Buffer Solution pH 10.0 @ 25°C, Poly BottleSKU: MSIB2281-1L-EAManufacturer: Midland Scientific500mL Blue Buffer Solution pH 10.0 @ 25°C, Poly Bottle (1 per EA )Learn Morewas $21.75 Special Price $18.28 - 500mL Yellow Buffer Solution pH 7.0 @ 25°C, Poly BottleSKU: MSIB2287-500ML-EAManufacturer: Midland Scientific500mL Yellow Buffer Solution pH 7.0 @ 25°C, Poly Bottle (1 per EA )Learn Morewas $9.80 Special Price $7.94
- Acetonitrile (with 0.1% Formic Acid) HPLC - 4X4LSKU: LC9894-4x4L-CSManufacturer: Dawn ScientificAcetonitrile (with 0.1% Formic Acid) HPLC - 4X4L (4 per CS )Learn Morewas $599.62 Special Price $584.63
- Acetonitirle : Water 20:80 ratio HPLC - 4X4LSKU: LC9895-4x4L-CSManufacturer: Dawn ScientificAcetonitirle : Water 20:80 ratio HPLC - 4X4L (4 per CS )Learn Morewas $414.62 Special Price $404.25
- Benedict Solutin - 1LSKU: TS14052-1L-EAManufacturer: Dawn ScientificBenedict Solutin - 1L (1 per EA )Learn Morewas $49.62 Special Price $48.38
- Fehling solution A TS - 1LSKU: TS14412-1L-EAManufacturer: Dawn ScientificFehling solution A TS - 1L (1 per EA )Learn Morewas $49.62 Special Price $48.38
- Fehling solution B TS - 500mLSKU: TS14413-500mL-EAManufacturer: Dawn ScientificFehling solution B TS - 500mL (1 per EA )Learn Morewas $48.62 Special Price $47.40
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