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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Phosphoric Acid, 20% w/w, 4.00 L Poly naturalSKU: CP103000-4A-EAManufacturer: Reagents IncPhosphoric Acid, 20% w/w, 4.00 L Poly natural (1 per EA )Learn Morewas $150.00 Special Price $112.32 - Kit Oil #8, 1.00 L Glass amberSKU: CK196900-1C-EAManufacturer: Reagents IncKit Oil #8, 1.00 L Glass amber (1 per EA )Learn Morewas $154.00 Special Price $115.56
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Ferroin TS - 500mLSKU: TS14112-500ml-EAManufacturer: Dawn ScientificFerroin TS - 500mL (1 per EA )Learn Morewas $94.62 Special Price $92.25 -
Silver Nitrate, 1 N Standardized Solution, 20L, CAS# 7761-88-8SKU: S-180-20LT-EAManufacturer: Spectrum ChemicalSilver Nitrate, 1 N Standardized Solution (1 per EA )Learn More$6,671.50 -
Potassium Hydroxide, 0.5N (0.5M), 500ML, Poly BottleSKU: LC193201-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1814 (1 per EA)Learn Morewas $39.40 Special Price $29.55 -
Hydrochloric Acid, 1.0N (1.0M), 20L, Cubitainer®SKU: LC153005-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1789 (1 per EA)Learn Morewas $212.50 Special Price $159.38 -
Iodine, 0.0282N (0.0141M), 1L, Amber GlassSKU: LC156302-EAManufacturer: LabChemShelf Life (months): 18, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $58.80 Special Price $44.10 -
Pan Indicator 0.3% In Etoh, 500ML, Amber GlassSKU: LC180901-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: UN1170 (1 per EA)Learn Morewas $79.90 Special Price $59.93 -
Potassium Hydroxide, 45 Percent (w/w) Aqueous Solution, Reagent, 500mL, CAS# 1310-58-3SKU: P1320-500MLPL-EAManufacturer: Spectrum ChemicalPotassium Hydroxide, 45 Percent (w/w) Aqueous Solution, Reagent is an aqueous solution of Caustic Potash and is the protypical strong base. Its reagent grade means this is the highest quality commercially available for this chemical and that the American Chemical Society has not officially set any specifications for this material. (1 per EA )Learn Morewas $142.05 Special Price $115.59 -
250mL Blue Buffer Solution pH 10.0 @ 25°C, Poly BottleSKU: MSI-B2281-250ML-EAManufacturer: Midland Scientific250mL Blue Buffer Solution pH 10.0 @ 25°C, Poly Bottle (1 per EA )Learn Morewas $28.80 Special Price $6.56 - Sodium Hydroxide, 0.1033 N, 1.00 L Poly naturalSKU: CS125500-1A-EAManufacturer: Reagents IncSodium Hydroxide, 0.1033 N, 1.00 L Poly natural (1 per EA )Learn Morewas $92.00 Special Price $69.12
- Ammonium Acetate, 65% w/v, 4.00 L Poly naturalSKU: CA006300-4A-EAManufacturer: Reagents IncAmmonium Acetate, 65% w/v, 4.00 L Poly natural (1 per EA )Learn Morewas $234.00 Special Price $176.04
- Silver Nitrate, 0.1 N, 4.00 L Glass amberSKU: C7303000-4C-EAManufacturer: Reagents IncSilver Nitrate, 0.1 N, 4.00 L Glass amber (1 per EA )Learn Morewas $574.00 Special Price $430.92
- Buffer, pH 8.00, 500.00 mL Poly naturalSKU: C2156100-500A-EAManufacturer: Reagents IncBuffer, pH 8.00, 500.00 mL Poly natural (1 per EA )Learn Morewas $29.00 Special Price $21.60
- Silver Nitrate, 0.025N (0.025M), 1L, Amber GlassSKU: LC226402-EAManufacturer: LabChemShelf Life (months): 18, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $98.60 Special Price $73.95
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Ammonia-Ammonium Chloride Buffer TS, (U.S.P. Test Solution), 1L, CAS# 56-91-7SKU: A-266-1LT-EAManufacturer: Spectrum ChemicalAmmonia-Ammonium Chloride Buffer TS, (U.S.P. Test Solution) is a ready-for-use solution for the purpose of conducting USP, National Formulary and assay tests and is prepared according to the specifications of the USP Pharmacopeial Convention. (1 per EA )Learn Morewas $344.45 Special Price $331.24 - Hydrochloric Acid, 0.12 N/IPA, 100.00 mL Poly naturalSKU: CH001700-100A-EAManufacturer: Reagents IncHydrochloric Acid, 0.12 N/IPA, 100.00 mL Poly natural (1 per EA )Learn Morewas $50.00 Special Price $37.80
- Phosphate Spot Test Reagent, 1.00 L Poly naturalSKU: CP210300-1A-EAManufacturer: Reagents IncPhosphate Spot Test Reagent, 1.00 L Poly natural (1 per EA )Learn Morewas $314.00 Special Price $235.44
- Blue Tetrazolium TS - 100mLSKU: TS14055-100ml-EAManufacturer: Dawn ScientificBlue Tetrazolium TS - 100mL (1 per EA )Learn Morewas $49.62 Special Price $48.38
- Nitric Acid, 6.0N (6.0M), 500ML, Amber GlassSKU: LC178701-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2031 (1 per EA)Learn Morewas $107.90 Special Price $80.92
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Potassium Ferrocyanide 10% W/V, 1L, Amber PolySKU: LC190602-EAManufacturer: LabChemShelf Life (months): 18, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $121.90 Special Price $91.42 -
Brij(R) 35, 30 Percent (w/v) Solution, 1L, CAS# 9005-00-9SKU: BR110-1LT-EAManufacturer: Spectrum ChemicalBrij(R) 35, 30 Percent (w/v) Solution is a polyoxyethylene fatty ether derived from stearyl alcohols designed to emulsify and produce stable dispersions of personal care products and functional cell membrane materials complexes. It appears as a colorless to light yellow liquid that may become hazy or form a precipitate. (1 per EA )Learn Morewas $172.60 Special Price $165.97 -
Ceric Ammonium Sulfate, 0.10 N (0.10 M) Solution in 1.0 N Sulfuric Acid, 4L, CAS# 10378-47-9SKU: C-456-4LTGL-EAManufacturer: Spectrum ChemicalCeric Ammonium Sulfate, 0.10 N (0.10 M) Solution in 1.0 N Sulfuric Acid (1 per EA )Learn Morewas $218.05 Special Price $177.43 - Sulfuric Acid, 0.94 N, 4.00 L Poly naturalSKU: CS108300-4A-EAManufacturer: Reagents IncSulfuric Acid, 0.94 N, 4.00 L Poly natural (1 per EA )Learn Morewas $72.00 Special Price $54.00
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