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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Silica Reagent #3, 2 ozSKU: R-1305U-C-EAManufacturer: Taylor TechnologiesSilica Reagent #3, 2 oz (1 per EA)Learn Morewas $15.68 Special Price $11.97 -
Acid Fuchsin, 25g, CAS# 3244-88-0SKU: AC155-25GM-EAManufacturer: Spectrum ChemicalAcid Fuchsin, an acidic dye, is used in histology to stain cytoplasm. 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$117.25 -
Formic Acid, 0.1% LCMS, 4.00 L Glass amberSKU: CF000600-4C-EAManufacturer: Reagents IncFormic Acid, 0.1% LCMS, 4.00 L Glass amber (1 per EA )Learn Morewas $183.00 Special Price $137.16 - Ammonium Hydroxide, 1 N, 1.00 L Poly naturalSKU: CA002500-1A-EAManufacturer: Reagents IncAmmonium Hydroxide, 1 N, 1.00 L Poly natural (1 per EA )Learn Morewas $93.00 Special Price $70.20
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Sodium Carbonate, 0.1N (0.05M), 4L, Poly BottleSKU: LC233504-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $70.80 Special Price $53.10 -
Silver Nitrate, 0.282 N Standardized Solution, 4L, CAS# 121-57-3SKU: S-170-4LT-EAManufacturer: Spectrum ChemicalSilver Nitrate, 0.282 N Standardized Solution (1 per EA )Learn Morewas $1,662.55 Special Price $1,352.81 -
Tclp Extraction Fluid #1, 10L, Cubitainer®SKU: LC259956-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $202.80 Special Price $152.10 -
Sulfuric Acid, 50 Percent (w/w) Solution, 500mL, CAS# 7664-93-9SKU: S-311-500ML-EAManufacturer: Spectrum ChemicalSulfuric Acid, 50 Percent (w/w) 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 $64.60 Special Price $52.56 -
Sodium Hydroxide, 50 Percent (w/w) Solution, Technical, 1L, CAS# 1310-73-2SKU: S-622-1LT-EAManufacturer: Spectrum ChemicalSodium Hydroxide, 50 Percent (w/w) Solution, Technical is commonly known as Caustic soda. Technical grade products supplied by Spectrum are indicative of a grade suitable for general industrial use. These materials may or may not have a Certificate of Analysis available. (1 per EA )Learn Morewas $92.75 Special Price $75.47 - Copper Sulfate, 0.05 M, 1.00 L Poly naturalSKU: CC258500-1A-EAManufacturer: Reagents IncCopper Sulfate, 0.05 M, 1.00 L Poly natural (1 per EA )Learn Morewas $123.00 Special Price $91.80
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Stannous Chloride, Acid, Stronger, TS - 100mLSKU: TS14272-100ml-EAManufacturer: Dawn ScientificStannous Chloride, Acid, Stronger, TS - 100mL (1 per EA )Learn Morewas $69.62 Special Price $67.88 -
Lanthanum Solution, 1L, Poly BottleSKU: LC160502-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: UN1789 (1 per EA)Learn Morewas $221.90 Special Price $166.43 -
Formaldehyde, 37 Percent, Solution, 1L, CAS# 50-00-0SKU: F3328-1LT-EAManufacturer: Spectrum ChemicalFormaldehyde, 37 Percent, Solution is also known as methanal and is the simplest aldehyde. It has many uses, one of which is formol, the famous embalming and tissue preserving liquid. It is also used in industrial application for the production of different types of resins. It is also a well known tissue fixative and was formerly a disinfectant. (1 per EA )Learn Morewas $317.60 Special Price $234.93 - Buffer Solution pH 5.0, 4L, Poly BottleSKU: LC123004-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $142.80 Special Price $107.10
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Methylene Blue, 1% w/v Solution, 470 mLSKU: M1019-470mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsMethylene Blue, 1% w/v Solution, 470 mL (1 per EA)Learn More$17.15 - Buffer Solution pH 4.0, 4L, Poly BottleSKU: LC122704-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $88.30 Special Price $66.23
- Silver Nitrate, 1 N, 1.00 L Amber polySKU: CS140000-1B-EAManufacturer: Reagents IncSilver Nitrate, 1 N, 1.00 L Amber poly (1 per EA )Learn Morewas $1,530.00 Special Price $1,148.04
- Reagent 1, 10.00 L CubitainerSKU: CR056000-10F-EAManufacturer: Reagents IncReagent 1, 10.00 L Cubitainer (1 per EA )Learn Morewas $672.00 Special Price $504.36
- Buffer, Hydrion(R), Dry, pH 7.40 +/- 0.02SKU: B1731-1PK-EAManufacturer: Spectrum ChemicalBuffer, Hydrion(R), Dry, pH 7.40 +/- 0.02 (1 per EA )Learn More$109.45
- Edta, 0.1M (0.2N), 1L, Poly BottleSKU: LC139002-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $67.70 Special Price $50.77
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Hardness Reagent (1 drop = 10 ppm hardness as CaCO₃), 32 ozSKU: R-0683-F-EAManufacturer: Taylor TechnologiesHardness Reagent (1 drop = 10 ppm hardness as CaCO₃), 32 oz (1 per EA)Learn Morewas $51.50 Special Price $39.35 -
Hydrochloric Acid, 10.0 N Solution, 1L, CAS# 128446-34-4SKU: H-285-1LT-EAManufacturer: Spectrum ChemicalHydrochloric Acid, 10.0 N Solution is a colorless, clear, highly corrosive, highly pungent solution of hydrogen chloride in water. As an monoprotic acid and one of the six common strong mineral acids it is the least likely to be subject to an oxidation-reduction reaction. Hydrochloric acid is frequently used during chemical analysis to prepare samples for analysis. It reacts with basic compounds, turning them into dissolved chlorides that can then undergo analysis. (1 per EA )Learn Morewas $145.55 Special Price $118.43 -
Silver Nitrate, 0.171 N Standardized Solution, 20L, CAS# 7761-88-8SKU: S-166-20LTCU-EAManufacturer: Spectrum ChemicalSilver Nitrate, 0.171 N Standardized Solution (1 per EA )Learn Morewas $4,137.65 Special Price $3,366.80 -
HEPES Buffered Saline Solution 2X, 250 MillilitersSKU: H17100-250.0-EAManufacturer: Research Products InternationalDimensions: 3.38 x 4.63 x 3.38 Weight: 0.63 - Research or further manufacturing use only, not for food or drug use. (1 per EA)Learn More$83.45
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LPS 200uL Universal Pipet Tips, Yellow, Bulk, PK1000
was $20.00 Special Price $15.75
BEAD BATH 20 L, 120 V, TYPE B PLUG, Liters/EA: 20
was $1,794.65 Special Price $1,714.78
4L Yellow Buffer Solution pH 7.0 @ 25°C, Poly Bottle
was $74.64 Special Price $21.46
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