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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Vario Silica Hr Reagent Set, F10 100 Tests, Ea/1SKU: 535700-EAManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 2429600. Lovibond VARIO Silica HR Reagent Set, 10 ml Sample, 100 Tests Includes: 531700, VARIO Silica HR Molybdate, F10 - 100 ct. 531710, VARIO Silica HR Acid Reagent, F10 - 100 ct. 531720, VARIO Silica HR Citric Acid, F1 (1 per EA)Learn More$115.10 -
Sulfuric Acid, 93% (66° Baume), 1.00 L Poly naturalSKU: C5102700-1A-EAManufacturer: Reagents IncSulfuric Acid, 93% (66° Baume), 1.00 L Poly natural (1 per EA )Learn Morewas $48.00 Special Price $35.64 -
Sulfuric Acid N/10, 2 oz, Dropper BottleSKU: R-0627S-10-C-EAManufacturer: Taylor TechnologiesSulfuric Acid N/10, 2 oz, Dropper Bottle (1 per EA)Learn Morewas $13.90 Special Price $10.63 -
Kauri-Butanol Solution, 500mLSKU: K-101-500MLGL-EAManufacturer: Spectrum ChemicalKauri-Butanol Solution is used for the determination of the relative solvent power of hydrocarbon solvents (ASTM D1133). (1 per EA )Learn Morewas $1,321.20 Special Price $1,088.25 -
Edta, 0.005M (0.01N), 1L, Poly BottleSKU: LC138202-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $47.90 Special Price $35.92 -
Polyseed Nx, Ea, 50 Capsule BottleSKU: LC1889050-EAManufacturer: LabChemShelf Life (months): , , UN Number: (1 per EA)Learn Morewas $340.60 Special Price $255.45 -
Potassium Iodide 10% W/V, 500ML, Amber PolySKU: LC197601-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $56.00 Special Price $42.00 -
Picric Acid, Saturated Aqueous Solution, 500mL, CAS# 88-89-1SKU: P-201-500ML-EAManufacturer: Spectrum ChemicalPicric Acid, Saturated Aqueous Solution is used in the production of explosives, matches, and electric batteries. 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 $82.75 Special Price $67.33 -
pH Calibration Solution Kit, 7.00, 4.00, 8oz., Storage solution 4oz.SKU: AI1108-EAManufacturer: Apera Instruments8oz pH Calibration Buffer Solution Kit (pH 4.00 & 7.00), 4oz plus storage solution for pH/ORP Electrodes High Accuracy (±0.01 pH): standardized against NIST certified pH references within 0.01 pH at 25°C (77°F). Ideal for the calibration of all kinds of p (1 per EA )Learn Morewas $28.00 Special Price $24.19 -
Arsenic Trioxide, Reagent, 100G, Amber GlassSKU: LC115059-EAManufacturer: LabChemShelf Life (months): , , UN Number: UN1561 (1 per EA)Learn Morewas $190.20 Special Price $142.65 - Weck's Reagent for Aluminum, 100.00 mL Poly naturalSKU: CW000500-100A-EAManufacturer: Reagents IncWeck's Reagent for Aluminum, 100.00 mL Poly natural (1 per EA )Learn Morewas $57.00 Special Price $43.85
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Chlorphenol Red Indicator, .75 ozSKU: R-1003G-A-EAManufacturer: Taylor TechnologiesChlorphenol Red Indicator, .75 oz (1 per EA)Learn Morewas $17.70 Special Price $13.53 -
Sodium Silicate, 36.9% to 38.1%, TechnicalSKU: S1136-1gal-EAManufacturer: 710 Spirits Rocky Mtn Reagents41 Baume; Type N (1 per EA)Learn More$31.70 -
NTA Cosolvent Solution, 32 ozSKU: R-0879-F-EAManufacturer: Taylor TechnologiesNTA Cosolvent Solution, 32 oz (1 per EA)Learn Morewas $31.47 Special Price $24.04 -
Sulfuric Acid .12N, 16 ozSKU: R-0687-E-EAManufacturer: Taylor TechnologiesSulfuric Acid .12N, 16 oz (1 per EA)Learn Morewas $25.75 Special Price $19.67 -
Sodium Silicate, 40 DEG Be Solution, 500mL, CAS# 6834-92-0SKU: S1435-500MLGL-EAManufacturer: Spectrum ChemicalSodium Silicate, 40 DEG Be 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 $129.95 Special Price $105.73 - Nitric Acid, 10% v/v Solution, 500 mLSKU: N1013-500mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsADD LW1100-055 (500mL DOT ACID PACKER) (1 per EA)Learn More$24.35
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Bromine Water, Saturated Solution, 500mL, CAS# 7726-95-6SKU: B-160-500MLGL-EAManufacturer: Spectrum ChemicalBromine Water, Saturated Solution is a yellow liquid and a powerful oxidizer. It is most commonly used as a reagent in chemical assays. (1 per EA )Learn Morewas $132.00 Special Price $107.41 -
Diazotized Sulfanilic Acid TS - 100mLSKU: TS14281-100ml-EAManufacturer: Dawn ScientificDiazotized Sulfanilic Acid TS - 100mL (1 per EA )Learn Morewas $79.62 Special Price $77.63 -
Citrate-Cyanide Solution, 500ML, Poly BottleSKU: LC131301-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: UN1935 (1 per EA)Learn Morewas $65.70 Special Price $49.28 - Sodium Bicarbonate-Sodium Chloride Solution, 1L, Poly BottleSKU: LC229482-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $44.90 Special Price $33.67
- Nitric Acid Technical 42 Baume, 2.20 L Poly naturalSKU: C5101700-2.2A-EAManufacturer: Reagents IncNitric Acid Technical 42 Baume, 2.20 L Poly natural (1 per EA )Learn Morewas $119.00 Special Price $89.64
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Silver Nitrate N/10, 2 oz, Dropper BottleSKU: R-0698-C-EAManufacturer: Taylor TechnologiesSilver Nitrate N/10, 2 oz, Dropper Bottle (1 per EA)Learn Morewas $22.04 Special Price $16.83 - Ammonia-Ammonium Chloride Buffer TS - 500mLSKU: TS14029-500ml-EAManufacturer: Dawn ScientificAmmonia-Ammonium Chloride Buffer TS - 500mL (1 per EA )Learn Morewas $79.62 Special Price $77.63
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