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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Acetic Acid 56% W/W, 1L, Poly BottleSKU: LC103102-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2790 (1 per EA)Learn Morewas $121.90 Special Price $91.42 -
Traceable, pH 4.005, 100ml pH Buffer Standard, PK6SKU: 4287-PKManufacturer: Control CompanyTraceable, pH 4.005, 100ml pH Buffer Standard, PK6 (6 per PK )Learn Morewas $24.82 Special Price $24.07 -
4L Yellow Buffer Solution pH 7.0 @ 25°C, CubitainerSKU: MSI-B2287-4CT-EAManufacturer: Midland Scientific4L Yellow Buffer Solution pH 7.0 @ 25°C, Cubitainer (1 per EA )Learn Morewas $112.81 Special Price $64.53 -
Sodium Hydroxide, 0.5 N Aqueous Solution, 1L, CAS# 1310-73-2SKU: S-360-1LT-EAManufacturer: Spectrum ChemicalSodium Hydroxide, 0.5 N Aqueous Solution - Spectrum solutions utilize the highest quality raw materials appropriate to your product. Most raw materials meet or exceed the specifications established by the American Chemical Society. Where appropriate, many finished products are traceable to NIST Standard Reference Materials. Manufacturing, quality control testing, and packaging are all performed in Spectrum’s own facilities. Record keeping and sample retention of all produced lots ensure product consistency and complete traceability. (1 per EA )Learn Morewas $79.85 Special Price $64.97 -
Oxalic Acid, 0.2 Normal Solution, 3.8 L, Poly GallonSKU: CF1199-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsOxalic Acid, 0.2 Normal Solution, 3.8 L, Poly Gallon (1 per EA )Learn More$94.75 -
Potassium Hydroxide, 45% w/w, Reagent, CAS# 1310-58-3SKU: P1045-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsCaustic Potash; Potassium Hydrate (1 per EA)Learn More$66.30 -
Sulfuric Acid, 50 Percent (w/w) Solution, 200L, CAS# 7664-93-9SKU: S-311-200LTBL-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 More$4,245.50 -
Potassium Biiodate, 0.0282N (0.00235M), 500ML, Poly BottleSKU: LC187351-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $71.40 Special Price $53.55 - Sodium Carbonate, 0.1N (0.05M), 1L, Poly BottleSKU: LC233502-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $60.00 Special Price $45.00
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Potassium Hydroxide, 2.0N (2.0M), 4L, Poly BottleSKU: LC193604-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1814 (1 per EA)Learn Morewas $146.30 Special Price $109.73 - Sodium Hydroxide-Sodium Thiosulfate, 4L, Poly BottleSKU: LC246004-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $95.20 Special Price $71.40
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Hydrochloric Acid, 50 Percent (v/v), Aqueous Solution, APHA, 2.5L, CAS# 7647-01-0SKU: H-195-2.5LT-EAManufacturer: Spectrum ChemicalHydrochloric Acid, 50 Percent (v/v), Aqueous Solution, APHA 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 $197.55 Special Price $160.75 -
Sodium Hydroxide, 50 Percent (w/v) Solution, 4L, CAS# 1310-73-2SKU: S-224-4LTPL-EAManufacturer: Spectrum ChemicalSodium Hydroxide, 50 Percent (w/v) 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 $108.60 Special Price $88.37 -
Sodium Thiosulfate, 0.01 N Aqueous Solution, 1L, CAS# 10102-17-7SKU: S-527-1LT-EAManufacturer: Spectrum ChemicalSodium Thiosulfate, 0.01 N Aqueous Solution (1 per EA )Learn Morewas $54.20 Special Price $44.11 -
Buffer Solution, pH 10.00 +/-0.02 @ 25 DEG C, Reference Standard, 1LSKU: B1170-1LT-EAManufacturer: Spectrum ChemicalBuffer Solution, pH 10.00 +/-0.02 @ 25 DEG C, Reference Standard are solutions mainly utilized to keep pH at a constant value in a variety of chemical applications. 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 $78.50 Special Price $63.87 -
Sodium Hydroxide, 50 Percent (w/v) Solution, 1L, CAS# 194043-92-0SKU: S-224-1LTPL-EAManufacturer: Spectrum ChemicalSodium Hydroxide, 50 Percent (w/v) 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 $104.15 Special Price $84.75 - Sodium Chloride, 2% w/w Solution, 3.8 L, Poly GallonSKU: CF1235-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsSodium Chloride, 2% w/w Solution, 3.8 L, Poly Gallon (1 per EA )Learn More$36.70
- Hydrochloric Acid, 1 Normal, 1 L, PolySKU: H1010-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsN/1 (1 M) (1 per EA)Learn More$22.35
- pH 10.00 Calibration Buffer, Blue, 3.8 LSKU: P1005-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsNIST Traceable; pH = 10.00 ? 0.01 @ 25 ?C (1 per EA)Learn More$32.75
- Ammonium Thiocyanate, 0.025N (0.025M), 500ML, Poly BottleSKU: LC113501-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $88.80 Special Price $66.60
- Ammonium Hydroxide, 0.5N (0.5M), 500ML, Poly BottleSKU: LC110701-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $55.30 Special Price $41.47
- Sodium Carbonate, 0.0455N (0.02275M), 1L, Poly BottleSKU: LC230202-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $54.30 Special Price $40.73
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Potassium Persulfate 5% W/V, 1L, Amber GlassSKU: LC200802-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $64.60 Special Price $48.45 -
Sulfuric Acid .6N, 2 oz w/ orange cap, Dropper BottleSKU: R-0736O-C-EAManufacturer: Taylor TechnologiesSulfuric Acid .6N, 2 oz w/ orange cap, Dropper Bottle (1 per EA)Learn Morewas $13.85 Special Price $10.58
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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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