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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Ammonium Oxalate, 4% w/v Solution, 1 L, PolySKU: A1034-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsAmmonium Oxalate, 4% w/v Solution, 1 L, Poly (1 per EA)Learn More$26.60 -
Bromothymol Blue Indicator, 1% w/v Aqueous, 120 mLSKU: B1021-120mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentspH 6.0 (yellow) - pH 7.6 (blue) (1 per EA)Learn More$18.85 - Sulfuric Acid, 2.5 Normal, 3.8 L, Poly GallonSKU: S1115-3.8L-EAManufacturer: 710 Spirits Rocky Mtn Reagents1.25 M (1 per EA)Learn More$40.25
- Phosphoric Acid, 50% w/w Solution, 1 L, PolySKU: P1211-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsPhosphoric Acid, 50% w/w Solution, 1 L, Poly (1 per EA )Learn More$139.10
- Sodium Chromate, 10% w/v Solution, 500 mL, PolySKU: S1022-500mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsChromic Acid, Disodium Salt, Tetrahydrate (1 per EA)Learn More$68.45
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Potassium Fluoride 50% W/V, 1L, Poly BottleSKU: LC191102-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $238.60 Special Price $178.95 - Fehlings Solution inBin, 1L, Poly BottleSKU: LC142102-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: UN1824 (1 per EA)Learn Morewas $64.40 Special Price $48.30
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Mercuric Nitrate, 0.1N (0.05M), 1L, Amber GlassSKU: LC166582-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $135.00 Special Price $101.25 -
Potassium Iodide 20% W/V, 20L, Cubitainer®SKU: LC198005-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $1,730.10 Special Price $1,297.58 -
Potassium Iodide 15% W/V, 10L, Cubitainer®SKU: LC197806-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $754.10 Special Price $565.57 -
Sodium Hydroxide, 10.0 N Aqueous Solution, APHA, 4L, CAS# 1310-73-2SKU: S-395-4LTPL-EAManufacturer: Spectrum ChemicalSodium Hydroxide, 10.0 N Aqueous Solution, APHA - As an APHA certified solution, this item meets the ASTM D1209 standards for use in water and waste water treatment facilities to determine the concentration of dissolved and particulate materials. Spectrum Chemical manufactured APHA grade products meet the toughest regulatory standards for quality and purity. (1 per EA )Learn Morewas $203.50 Special Price $165.59 -
Sodium Thiosulfate, 0.100 N Aqueous Solution, APHA, 20L, CAS# 10102-17-7SKU: S-535-20LT-EAManufacturer: Spectrum ChemicalSodium Thiosulfate, 0.100 N Aqueous Solution, APHA, is part of a group of analytical solution products used in the Standard Methods testing of water and wastewater. Standard Methods is a joint publication of the American Public Health Association (APHA), the American Water Works Association (AWWA), and the Water Environment Federation (WEF). (1 per EA )Learn Morewas $346.75 Special Price $282.15 - Bromophenol Blue, 0.1% w/v Solution, 3.8 LSKU: B1018-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentspH 3.0 (yellow) - pH 4.6 (blue) (1 per EA)Learn More$41.55
- Bromocresol Green Indicator, 0.1% w/v Aqueous, 120 mLSKU: B1031-120mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentspH 3.8 (yellow) - pH 5.4 (blue) (1 per EA)Learn More$16.30
- Cresolphthalein (o-), 0.04% w/v in Denatured Ethanol, 500 mLSKU: C1027-500mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentspH 8.2 (colorless) - pH 9.8 (violet) (1 per EA)Learn More$27.10
- Iodine, 0.02 Normal, 1 L, Amber GlassSKU: I1017-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsIodine, 0.02 Normal, 1 L, Amber Glass (1 per EA)Learn More$23.80
- Sodium Hydroxide, 0.1 Normal, 1 L, PolySKU: S1027-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsN/10 (0.1 M) (1 per EA)Learn More$20.90
- Barium Chloride, 20% w/v, 3.8 L, Poly GallonSKU: B1016-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsBarium Chloride, 20% w/v, 3.8 L, Poly Gallon (1 per EA)Learn More$69.25
- Ferrous Ammonium Sulfate, 0.1 Normal, 3.8 L, Amber GlassSKU: F1006-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsN/10 (0.05 M); in 2 N Sulfuric Acid (1 per EA)Learn More$66.10
- Hydrogen Peroxide, ACS, 2.2 L, PPQ (Poly)SKU: H1054-2.2L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsHydrogen Peroxide, ACS, 2.2 L, PPQ (Poly) (1 per EA )Learn More$63.70
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Sodium Hydroxide, 25 Percent (w/v) Solution, 4L, CAS# 1310-73-2SKU: S-237-4LTPL-EAManufacturer: Spectrum ChemicalSodium Hydroxide, 25 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 $157.00 Special Price $127.75 -
pHenolpHthalein 0.08% In Methanol, 500ML, Poly BottleSKU: LC182301-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: UN1993 (1 per EA)Learn Morewas $39.10 Special Price $29.32 -
Long Range Indicator, .75 ozSKU: R-1003U-A-EAManufacturer: Taylor TechnologiesLong Range Indicator, .75 oz (1 per EA)Learn Morewas $10.82 Special Price $8.26 - Ammonium Bifluoride, 10% w/v Solution, 1 L, PolySKU: A1025-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsAmmnonium Hydrogendifluoride (1 per EA)Learn More$20.70
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