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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Copper Reagent #1, 16 ozSKU: R-0860-E-EAManufacturer: Taylor TechnologiesCopper Reagent #1, 16 oz (1 per EA)Learn Morewas $93.52 Special Price $71.44 -
Acetic Acid, 1% v/v Solution, 500 mLSKU: A1003-500mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsAcetic Acid, 1% v/v Solution, 500 mL (1 per EA)Learn More$16.50 -
Sodium Thiosulfate, 0.01N (0.01M), 1L, Poly BottleSKU: LC250002-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $49.20 Special Price $37.85 -
Arsenazo III, 0.05% Aqueous, 500.00 mL Glass amberSKU: C8302900-500C-EAManufacturer: Reagents IncArsenazo III, 0.05% Aqueous, 500.00 mL Glass amber (1 per EA )Learn Morewas $158.00 Special Price $118.80 -
500mL Yellow Buffer Solution pH 7.0 @ 25°C, Poly BottleSKU: B2287-500ML-EAManufacturer: Midland Scientific500mL Yellow Buffer Solution pH 7.0 @ 25°C, Poly Bottle (1 per EA )Learn Morewas $34.46 Special Price $8.59 - Ammonium Hydroxide 25% V/V (1+3), 1L, Poly BottleSKU: LC111652-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $87.60 Special Price $65.70
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Ferric Ammonium Sulfate, Saturated, 125ML, Poly BottleSKU: LC142757-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $37.30 Special Price $27.97 -
Copper Sulfate, Spgr 1.186 @ 18.4C, 4L, Poly BottleSKU: LC134454-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $142.70 Special Price $107.03 - Hydrogen Peroxide, 4% w/w, 4.00 L Poly naturalSKU: CH299500-4A-EAManufacturer: Reagents IncHydrogen Peroxide, 4% w/w, 4.00 L Poly natural (1 per EA )Learn Morewas $119.00 Special Price $89.64
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Ferrous Sulfate, Acid, TS - 100mLSKU: TS14114-100ml-EAManufacturer: Dawn ScientificFerrous Sulfate, Acid, TS - 100mL (1 per EA )Learn Morewas $49.62 Special Price $48.38 - Sulfuric Acid 10% W/W, 1L, Poly BottleSKU: LC255902-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2796 (1 per EA)Learn Morewas $44.40 Special Price $34.16
- Sulfuric Acid, 1.0N (0.5M), 4L, Poly BottleSKU: LC257704-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2796 (1 per EA)Learn Morewas $77.90 Special Price $59.93
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Iodine, 0.0156N, 1L, Amber GlassSKU: LC156022-EAManufacturer: LabChemShelf Life (months): 18, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $79.20 Special Price $59.40 - Ferric Chloride, 40% w/w, TechnicalSKU: F1031-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsFerric Chloride, 42? Be (1 per EA)Learn More$30.90
- Zinc Acetate Solution, 125ML, Poly BottleSKU: LC271007-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $28.20 Special Price $21.70
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Buffer, Hydrion(R), Dry, pH 4.00 +/- 0.02SKU: B1711-1PK-EAManufacturer: Spectrum ChemicalBuffer, Hydrion(R), Dry, pH 4.00 +/- 0.02 - All Hydrion buffer salts are directly traceable to NIST standards and certified to +/- 0.02 ph units at 25 DEG C. These solutions are mainly utilized to keep pH at a constant value in a variety of chemical applications. Ungraded products supplied by Micro Essential Laboratory 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$91.15 - Chlorophenol Red, 0.1% w/v Aqueous, 120 mLSKU: C1012-120mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentspH 4.8 (yellow) - pH 6.4 (red) (1 per EA)Learn More$24.20
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Ammonium Hydroxide 10% V/V (1+9), 500ML, Poly BottleSKU: LC111801-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $59.00 Special Price $44.25 - Acetic Acid, 5% v/v Solution, 120 mLSKU: A1040-120mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsAcetic Acid, 5% v/v Solution, 120 mL (1 per EA)Learn More$14.70
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Formaldehyde, 37 Percent, USP, 4L, CAS# 50-00-0SKU: FO110-4LTPL-EAManufacturer: Spectrum ChemicalFormaldehyde, 37 Percent, USP. All Spectrum Chemical USP grade products are manufactured, packaged and stored under current Good Manufacturing Practices (cGMP). (1 per EA )Learn Morewas $204.25 Special Price $151.08 - Nitric Acid, 50% v/v Solution, 500 mLSKU: N1016-500mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsADD LW1100-055 (500mL DOT ACID PACKER) (1 per EA)Learn More$34.15
- Nitric Acid, 70% v/v, 2.50 L Glass clearSKU: CN001900-2.5D1-EAManufacturer: Reagents IncNitric Acid, 70% v/v, 2.50 L Glass clear (1 per EA )Learn Morewas $157.00 Special Price $117.72
- Potassium Stannate, 100.00 lb EachSKU: CP105300-100LB-EAManufacturer: Reagents IncPotassium Stannate, 100.00 lb Each (1 per EA )Learn Morewas $12,700.00 Special Price $9,524.52
- Sodium Lauryl Sulfate, 0.008 N, 500.00 mL Poly naturalSKU: CS115600-500A-EAManufacturer: Reagents IncSodium Lauryl Sulfate, 0.008 N, 500.00 mL Poly natural (1 per EA )Learn Morewas $45.00 Special Price $33.48
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