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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Eriochrome Black TS, (U.S.P. Test Solution), 500mL, CAS# 1787-61-7SKU: E-148-500ML-EAManufacturer: Spectrum ChemicalEriochrome Black 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 $742.10 Special Price $713.63 -
Potassium Iodate, 0.1 Normal, 3.8 L, Amber PolySKU: P1048-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsN/10 (0.0167 M); Iodic Acid, Potassium Salt (1 per EA)Learn More$59.05 - Silver Nitrate, 0.2 Normal, 3.8 L, Amber PolySKU: S1046-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsN/5 (0.2 M) (1 per EA)Learn More$539.35
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Water Hardness Buffer Odorless, 500.00 mL Poly naturalSKU: CW000800-500A-EAManufacturer: Reagents IncWater Hardness Buffer Odorless, 500.00 mL Poly natural (1 per EA )Learn Morewas $60.00 Special Price $46.16 - Calcium Chloride, 2.75% w/v, 20.00 L CubitainerSKU: C7163100-20F-EAManufacturer: Reagents IncCalcium Chloride, 2.75% w/v, 20.00 L Cubitainer (1 per EA )Learn Morewas $297.00 Special Price $228.48
- Universal Indicator, 500 mLSKU: U1000-500mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsBogen's Formula; pH 1 (red), pH 2 (rose), pH 3 (reddish/orange), pH 4 (orange/red), pH 5 (orange), pH 6 (yellow), pH 7 (yellow/green), pH 8 (green), pH 9 (blue/green), pH 10 (blue) (1 per EA)Learn More$42.45
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Potassium Hydroxide, 0.5N (0.5M) In Isopropanol, 500ML, Poly BottleSKU: LC195301-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: UN2924 (1 per EA)Learn Morewas $64.90 Special Price $48.68 -
Sodium Hydroxide 50% W/V, 10L, Cubitainer®SKU: LC241406-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $479.50 Special Price $359.63 -
Copper Sulfate, Spgr 1.186 @ 18.4C, 1L, Poly BottleSKU: LC134452-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $60.90 Special Price $45.67 -
Sulfuric Acid, 0.05N (0.025M), 4L, Poly BottleSKU: LC256754-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $88.10 Special Price $66.07 -
PAA Titrating Solution, 2 oz, Dropper BottleSKU: R-0929-C-EAManufacturer: Taylor TechnologiesPAA Titrating Solution, 2 oz, Dropper Bottle (1 per EA)Learn Morewas $36.25 Special Price $27.69 -
Potassium Dichromate, 0.200 N, 500mL, CAS# 7778-50-9SKU: P-344-500ML-EAManufacturer: Spectrum ChemicalPotassium Dichromate, 0.200 N (1 per EA )Learn Morewas $50.20 Special Price $40.85 -
Ammonium Sulfide, Solution, 2.5L, CAS# 103-90-2SKU: A1943-2.5LTPV-EAManufacturer: Spectrum ChemicalAmmonium Sulfide, 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 $1,051.50 Special Price $855.60 - Acetic Acid, 10% v/v Solution, 1 LSKU: A1006-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsAcetic Acid, 10% v/v Solution, 1 L (1 per EA)Learn More$21.80
- Eosin Y, 1% w/v Solution, 15 mLSKU: E1002-15mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsEosin Y, 1% w/v Solution, 15 mL (1 per EA)Learn More$9.35
- EDTA, 0.1 Molar, 3.8 L, Poly GallonSKU: E1008-3.8L-EAManufacturer: 710 Spirits Rocky Mtn Reagents0.2 N; Ethylenediaminetetraacetic Acid, Disodium Salt, Dihydrate (1 per EA)Learn More$51.90
- TISAB II, 1 LSKU: T1027-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsTISAB II, 1 L (1 per EA)Learn More$50.60
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Ferroin Indicator, 500 mLSKU: F1005-500mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsOxidation - Reduction Indicator (1 per EA)Learn More$69.65 - Silver Nitrate, 1% w/v Solution, 3.8 L, Amber PolySKU: S1007-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsSilver Nitrate, 1% w/v Solution, 3.8 L, Amber Poly (1 per EA)Learn More$216.95
- Benedict Quantitative Solution, 500ML, Poly BottleSKU: LC116601-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $84.00 Special Price $63.00
- Ammonium Molybdate 10% W/V, 4L, Poly BottleSKU: LC112504-EAManufacturer: LabChemShelf Life (months): 12, , UN Number: (1 per EA)Learn Morewas $404.90 Special Price $303.67
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Silver Nitrate 10% W/V, 500ML, Amber GlassSKU: LC225501-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $703.30 Special Price $527.47 -
Blue-Ten(TM) Buffer Solution, pH 10.00, (+/-0.01 @ 25 DEG C)Color-coded BLUE, Reference Standard1LSKU: B1172-1LT-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 $68.70 Special Price $55.89 - Bromothymol Blue/Bromocresol Purple, 0.1% w/v Solution, 120 mLSKU: B1030-120mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentspH 6.7 Midpoint (1 per EA)Learn More$31.35
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