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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Potassium Hydroxide 30% W/V, 4L, Poly BottleSKU: LC192404-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1814 (1 per EA)Learn Morewas $158.90 Special Price $119.18 -
Kaydol™/Hexadecane, 65/35 v/v, 500.00 mL Glass amberSKU: CK000300-500C-EAManufacturer: Reagents IncKaydol™/Hexadecane, 65/35 v/v, 500.00 mL Glass amber (1 per EA )Learn Morewas $485.00 Special Price $363.96 -
Alkaline Sodium Hydrosulphite TS - 100mLSKU: TS14022-100ml-EAManufacturer: Dawn ScientificAlkaline Sodium Hydrosulphite TS - 100mL (1 per EA )Learn Morewas $69.62 Special Price $67.88 - Kroll's Reagent, 100.00 mL Poly naturalSKU: CK010500-100A-EAManufacturer: Reagents IncKroll's Reagent, 100.00 mL Poly natural (1 per EA )Learn Morewas $90.00 Special Price $68.04
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Yellow-Seven(TM) Buffer Solution, pH 7.00 (+/-0.01 @ 25 DEG C), Color-coded Yellow, Reference StandardSKU: B1168-1LT-EAManufacturer: Spectrum ChemicalYellow-Seven (TM) Buffer Solution, pH 7.00 (+/-0.01 @ 25 DEG C), Color-coded Yellow, Reference Standard is an inorganic solution in water. 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 $70.65 Special Price $57.49 -
Silver Nitrate, 2.9% w/v Solution, 100 mL, Glass w/ DropperSKU: S1005-100mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsSilver Nitrate, 2.9% w/v Solution, 100 mL, Glass w/ Dropper (1 per EA)Learn More$36.95 - Silver Nitrate, 2.9% w/v Solution, 500 mL, Amber PolySKU: S1005-500mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsSilver Nitrate, 2.9% w/v Solution, 500 mL, Amber Poly (1 per EA)Learn More$113.05
- Sodium Hydroxide 20% W/V, 4L, Poly BottleSKU: LC240904-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $104.90 Special Price $80.70
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Sulfosalicylic Acid 3% W/V, 1L, Amber PolySKU: LC255302-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $69.20 Special Price $53.24 -
Hardness Reagent (1 drop = 10 ppm hardness as CaCO₃), 2 oz, Dropper BottleSKU: R-0683-C-EAManufacturer: Taylor TechnologiesHardness Reagent (1 drop = 10 ppm hardness as CaCO₃), 2 oz, Dropper Bottle (1 per EA)Learn Morewas $10.08 Special Price $7.69 - Phenolphthalein, 2% w/v in Denatured Ethanol, 120 mLSKU: P1013-120mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentspH 8.0 (colorless) - pH 10.0 (pink) (1 per EA)Learn More$19.05
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Silver Nitrate, 1 N Standardized Solution, 1L, CAS# 10039-32-4SKU: S-180-1LT-EAManufacturer: Spectrum ChemicalSilver Nitrate, 1 N Standardized Solution (1 per EA )Learn Morewas $1,162.50 Special Price $945.92 -
Sodium Oxalate, 0.025M (0.05N), 500ML, Poly BottleSKU: LC247201-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $53.40 Special Price $41.09 -
Perchloric Acid, 0.1N (0.1M) In Glacial Acetic Acid, 1L, Amber GlassSKU: LC181002-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2789 (1 per EA)Learn Morewas $115.10 Special Price $86.32 -
Sodium Hydroxide, 2.5N (2.5M), 1L, Poly BottleSKU: LC244002-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $59.70 Special Price $44.78 -
Ferric Chloride, 41 DEG Be Solution, 500mL, CAS# 7705-08-0SKU: F1025-500MLPL-EAManufacturer: Spectrum ChemicalFerric Chloride, 41 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 $111.70 Special Price $66.11 - Tartaric Acid 10% W/V, 500ML, Poly BottleSKU: LC259701-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $56.20 Special Price $43.23
- Sodium Thiosulfate, 2.0N (2.0M), 4L, Poly BottleSKU: LC251504-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $219.10 Special Price $168.56
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Total Hardness Reagent, 16 ozSKU: R-0854-E-EAManufacturer: Taylor TechnologiesTotal Hardness Reagent, 16 oz (1 per EA)Learn Morewas $55.04 Special Price $42.04 -
pH 10.01 Calibration Buffer Solution 8 ozSKU: AI1103-EAManufacturer: Apera InstrumentspH 10.01 Calibration Buffer Solution 8 oz, 0.01 pH Accuracy at 25°C (77°F) 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 pH meters/tester Color-coded, D (1 per EA )Learn Morewas $11.00 Special Price $9.50 - Ammonia TS, Stronger - 500mLSKU: TS14028-500ml-EAManufacturer: Dawn ScientificAmmonia TS, Stronger - 500mL (1 per EA )Learn Morewas $84.62 Special Price $82.50
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Hydrogen Peroxide, 15% w/w Solution, Technical, 1 gal, CAS# 7722-84-1SKU: H1024-1gal-EAManufacturer: 710 Spirits Rocky Mtn ReagentsHydrogen Peroxide, 15% w/w Solution, Technical, 1 gal, CAS# 7722-84-1 (1 per EA)Learn More$33.50 - Sodium Hypochlorite TS - 100mLSKU: TS14260-100ml-EAManufacturer: Dawn ScientificSodium Hypochlorite TS - 100mL (1 per EA )Learn Morewas $35.62 Special Price $34.73
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Silver Nitrate Reagent (25 mL sample, 1 drop = 10 ppm Clˉ), 2 oz, Dropper BottleSKU: R-0706-C-EAManufacturer: Taylor TechnologiesSilver Nitrate Reagent (25 mL sample, 1 drop = 10 ppm Clˉ), 2 oz, Dropper Bottle (1 per EA)Learn Morewas $23.28 Special Price $17.78
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4L Yellow Buffer Solution pH 7.0 @ 25°C, Poly Bottle
was $74.64 Special Price $21.46
BEAD BATH 20 L, 120 V, TYPE B PLUG, Liters/EA: 20
was $1,794.65 Special Price $1,714.78
LPS 200uL Universal Pipet Tips, Yellow, Bulk, PK1000
was $20.00 Special Price $15.75
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