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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Phenylarsine Oxide, 0.0375 N, 1L, CAS# 637-03-6SKU: P-361-1LT-EAManufacturer: Spectrum ChemicalPhenylarsine Oxide, 0.0375 N (1 per EA )Learn Morewas $311.55 Special Price $253.51 -
Potassium Hydroxide, 10.0 N Solution, 4L, CAS# 1310-58-3SKU: P-790-4LT-EAManufacturer: Spectrum ChemicalPotassium Hydroxide, 10.0 N Solution (1 per EA )Learn Morewas $221.15 Special Price $179.95 -
Buffer Solution, pH 10.00 +/-0.02 @ 25 DEG C, Reference Standard, 20LSKU: B1170-20LTCU-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 $317.60 Special Price $258.43 -
Blue-Ten(TM) Buffer Solution, pH 10.00, (+/-0.01 @ 25 DEG C)Color-coded BLUE, Reference Standard20LSKU: B1172-20LT-EAManufacturer: Spectrum ChemicalBlue-Ten (TM) Buffer Solution, pH 10.00, (+/-0.01 @ 25 DEG C)Color-coded BLUE, Reference Standard (1 per EA )Learn Morewas $285.40 Special Price $232.23 -
Phenylarsine Oxide, 0.0375 N, 4L, CAS# 637-03-6SKU: P-361-4LT-EAManufacturer: Spectrum ChemicalPhenylarsine Oxide, 0.0375 N (1 per EA )Learn Morewas $703.50 Special Price $676.51 -
Bromothymol Blue Indicator, 0.1% w/v in Denatured Ethanol, 120 mL, PolySKU: B1097-120mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsBromothymol Blue Indicator, 0.1% w/v in Denatured Ethanol, 120 mL, Poly (1 per EA )Learn More$20.40 - Hydrochloric Acid, 20% v/v Solution, 500 mLSKU: H1007-500mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsHydrochloric Acid, 20% v/v Solution, 500 mL (1 per EA)Learn More$20.95
- Phenolphthalein, 1% w/v in Denatured Ethanol, 120 mLSKU: P1012-120mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentspH 8.0 (colorless) - pH 10.0 (pink) (1 per EA)Learn More$17.90
- Potassium Iodate, 0.1 Normal, 1 L, Amber PolySKU: P1048-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsN/10 (0.0167 M); Iodic Acid, Potassium Salt (1 per EA)Learn More$26.60
- Sodium Hydroxide, 25% w/w Solution, 1 LSKU: S1032-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsCaustic Soda (1 per EA)Learn More$29.85
- Starch Indicator, 1% w/v Solution, 1 LSKU: S1047-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsPotato Starch; Stabilized with Salicylic Acid (1 per EA)Learn More$20.00
- Nitric Acid, 30% v/v Solution, 2.2 LSKU: N1022-2.2L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsNitric Acid, 30% v/v Solution, 2.2 L (1 per EA)Learn More$60.65
- TISAB II, 3.8 LSKU: T1027-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsTISAB II, 3.8 L (1 per EA)Learn More$113.70
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Alkaline Mercuric-Potassium Iodide TS - 100mLSKU: TS14020-100ml-EAManufacturer: Dawn ScientificAlkaline Mercuric-Potassium Iodide TS - 100mL (1 per EA )Learn Morewas $64.62 Special Price $63.01 -
Galaxolide, 50 Percent Solution in Diethyl Phthalate, 100g, CAS# 1222-05-5SKU: G1438-100GM-EAManufacturer: Spectrum ChemicalGalaxolide, 50 Percent Solution in Diethyl Phthalate, also known as Hexahydrohexamethyl cyclopentabenzopyran, is a synthetic ingredient used in fragrances and is known for its woody scent. 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$164.10 -
Tannic Acid, 500.00 g wide mouthSKU: C2116000-500A5-EAManufacturer: Reagents IncTannic Acid, 500.00 g wide mouth (1 per EA )Learn Morewas $224.00 Special Price $168.48 - Potassium Chromate, 5% w/v, 1.00 L Poly naturalSKU: CP101500-1A-EAManufacturer: Reagents IncPotassium Chromate, 5% w/v, 1.00 L Poly natural (1 per EA )Learn Morewas $55.50 Special Price $42.12
- TMAH 1% in Methanol, 1.00 L Glass amberSKU: CT007700-1C-EAManufacturer: Reagents IncTMAH 1% in Methanol, 1.00 L Glass amber (1 per EA )Learn Morewas $105.00 Special Price $80.78
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Ammonium Hydroxide 50% V/V (1+1), 1L, Poly BottleSKU: LC111402-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2672 (1 per EA)Learn Morewas $97.30 Special Price $72.98 -
Potassium Permanganate, 0.5N (0.1M), 10L, Cubitainer®SKU: LC200306-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $355.10 Special Price $266.33 -
Ferric Chloride TS, USP Test SolutionSKU: F-166-100ML-EAManufacturer: Spectrum ChemicalFerric Chloride TS, USP 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 $188.35 Special Price $181.13 -
Ferric Chloride TS, USP Test SolutionSKU: F-166-1LT-EAManufacturer: Spectrum ChemicalFerric Chloride TS, USP 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 $383.90 Special Price $369.17 -
Sodium Hydroxide, 0.100 N Solution, APHA, 1L, CAS# 1310-73-2SKU: S-340-1LT-EAManufacturer: Spectrum ChemicalSodium Hydroxide, 0.100 N Solution, APHA is a standard solution of Caustic soda ideally suited for laboratory titrimetric techniques. You can rely on the quality of LabChem analytical test solutions for lot-to-lot reproducibility. (1 per EA )Learn Morewas $77.70 Special Price $63.21 -
Ammonium Chloride Hydroxide Buffer, pH 10.0, 1 LSKU: A1030-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsAmmonium Chloride Hydroxide Buffer, pH 10.0, 1 L (1 per EA)Learn More$28.55
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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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