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 Chloride, Sat'd Aqueous, 10.00 L CubitainerSKU: CS142000-10F-EAManufacturer: Reagents IncSodium Chloride, Sat'd Aqueous, 10.00 L Cubitainer (1 per EA )Learn Morewas $144.00 Special Price $108.00 - Electrode Filling Solution, 500.00 mL Poly naturalSKU: CE001700-500A-EAManufacturer: Reagents IncElectrode Filling Solution, 500.00 mL Poly natural (1 per EA )Learn Morewas $52.00 Special Price $37.80
- Tropaeolin O Indicator, 500.00 mL Glass amberSKU: CT001700-500C-EAManufacturer: Reagents IncTropaeolin O Indicator, 500.00 mL Glass amber (1 per EA )Learn Morewas $185.00 Special Price $142.32
- Vanadate-Molybdate Reagent, 1.00 L Poly naturalSKU: CV102000-1A-EAManufacturer: Reagents IncVanadate-Molybdate Reagent, 1.00 L Poly natural (1 per EA )Learn Morewas $87.00 Special Price $66.93
- Davis Reagent, 1.00 L Glass amberSKU: CD000500-1C-EAManufacturer: Reagents IncDavis Reagent, 1.00 L Glass amber (1 per EA )Learn Morewas $210.00 Special Price $157.68
- Sodium Citrate Buffer, 10% w/v, 4.00 L Poly naturalSKU: CS005100-4A-EAManufacturer: Reagents IncSodium Citrate Buffer, 10% w/v, 4.00 L Poly natural (1 per EA )Learn Morewas $178.00 Special Price $133.92
- Caustic Blue Indicator, 0.1%, 50.00 mL Glass amberSKU: CC001100-50C-EAManufacturer: Reagents IncCaustic Blue Indicator, 0.1%, 50.00 mL Glass amber (1 per EA )Learn Morewas $59.00 Special Price $44.28
- Sodium Thiosulfate, 30% w/v, 20.00 L CubitainerSKU: CS186200-20F-EAManufacturer: Reagents IncSodium Thiosulfate, 30% w/v, 20.00 L Cubitainer (1 per EA )Learn Morewas $200.00 Special Price $150.12
- Sodium Formate Buffer, pH 2.9, 1.00 L Poly naturalSKU: CS046400-1A-EAManufacturer: Reagents IncSodium Formate Buffer, pH 2.9, 1.00 L Poly natural (1 per EA )Learn Morewas $145.00 Special Price $109.08
- Hydrochloric Acid, 1.0 N/IPA, 1.00 L Glass amberSKU: CH104100-1C-EAManufacturer: Reagents IncHydrochloric Acid, 1.0 N/IPA, 1.00 L Glass amber (1 per EA )Learn Morewas $80.00 Special Price $60.48
- Buffer, pH 1.00, 10.00 L CubitainerSKU: C2155100-10F-EAManufacturer: Reagents IncBuffer, pH 1.00, 10.00 L Cubitainer (1 per EA )Learn Morewas $150.00 Special Price $112.32
- Indicator 1, Bromophenol Blue, 1.00 L Poly naturalSKU: CI160500-1A-EAManufacturer: Reagents IncIndicator 1, Bromophenol Blue, 1.00 L Poly natural (1 per EA )Learn Morewas $53.00 Special Price $39.96
- Sulfuric Acid, 0.5 N, 20.00 L CubitainerSKU: C7305540-20F-EAManufacturer: Reagents IncSulfuric Acid, 0.5 N, 20.00 L Cubitainer (1 per EA )Learn Morewas $188.00 Special Price $141.48
- PAN Indicator, 0.3% / Ethanol, 500.00 mL Glass amberSKU: CP004800-500C-EAManufacturer: Reagents IncPAN Indicator, 0.3% / Ethanol, 500.00 mL Glass amber (1 per EA )Learn Morewas $182.00 Special Price $136.08
- Monochloroacetic Acid Buffer, 1.00 L Glass amberSKU: CM003300-1C-EAManufacturer: Reagents IncMonochloroacetic Acid Buffer, 1.00 L Glass amber (1 per EA )Learn Morewas $557.00 Special Price $417.96
- Sulfuric Acid, 93% (66° Baume), 20.00 L Winpak blueSKU: C5102700-20E7-EAManufacturer: Reagents IncSulfuric Acid, 93% (66° Baume), 20.00 L Winpak blue (1 per EA )Learn Morewas $275.00 Special Price $206.28
- Pot Acid Phthalate, 10 ppm, 1.00 L Glass amberSKU: CP081000-1C-EAManufacturer: Reagents IncPot Acid Phthalate, 10 ppm, 1.00 L Glass amber (1 per EA )Learn Morewas $85.00 Special Price $63.72
- TKN Digestion Reagent, 10.00 L CubitainerSKU: CT1007R0-10F-EAManufacturer: Reagents IncTKN Digestion Reagent, 10.00 L Cubitainer (1 per EA )Learn Morewas $575.00 Special Price $442.36
- Zinc Sulfate, 0.1 M, 1.00 L Poly naturalSKU: CZ130200-1A-EAManufacturer: Reagents IncZinc Sulfate, 0.1 M, 1.00 L Poly natural (1 per EA )Learn Morewas $115.00 Special Price $88.47
- Potassium Iodide, saturated, 4.00 L glass sc ambSKU: CP196000-4C1-EAManufacturer: Reagents IncPotassium Iodide, saturated, 4.00 L glass sc amb (1 per EA )Learn Morewas $1,610.00 Special Price $1,207.44
- Picric Acid, 4% in EtOH w/surf, 250.00 mL Glass amberSKU: CP122000-250C-EAManufacturer: Reagents IncPicric Acid, 4% in EtOH w/surf, 250.00 mL Glass amber (1 per EA )Learn Morewas $165.00 Special Price $126.93
- Silver Nitrate, 0.171 N, 1.00 L Glass amberSKU: C7303050-1C-EAManufacturer: Reagents IncSilver Nitrate, 0.171 N, 1.00 L Glass amber (1 per EA )Learn Morewas $389.00 Special Price $291.60
- Copper Sulfate, 1.6%/0.6%H2SO4, 500.00 mL Poly naturalSKU: CC256100-500A-EAManufacturer: Reagents IncCopper Sulfate, 1.6%/0.6%H2SO4, 500.00 mL Poly natural (1 per EA )Learn Morewas $43.00 Special Price $32.40
- Nitric Acid, 35% w/v (50% v/v), 2.50 L Glass scSKU: CN209700-2.5D-EAManufacturer: Reagents IncNitric Acid, 35% w/v (50% v/v), 2.50 L Glass sc (1 per EA )Learn Morewas $365.00 Special Price $273.24
- Manufacturer Reagents Inc Remove This Item
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