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 Iodide, 10% w/v Solution, 1 L, Amber PolySKU: P1051-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsPotide (1 per EA)Learn More$44.85 - Potassium Thiocyanate, 0.1 Normal, 3.8 L, Poly GallonSKU: P1058-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsN/10 (0.1 M); Potassium Sulfocyanate; Potassium Thiocyanide (1 per EA)Learn More$36.70
- Potassium Chloride, 4 Molar, 1 L, PolySKU: P1068-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsPotassium Chloride, 4 Molar, 1 L, Poly (1 per EA)Learn More$35.35
- Potassium Permanganate, 0.05 Normal, 1 L, Amber PolySKU: P1071-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsPotassium Permanganate, 0.05 Normal, 1 L, Amber Poly (1 per EA)Learn More$22.80
- Potassium Permanganate, 0.2 Normal, 3.8 L, Amber PolySKU: P1072-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsPotassium Permanganate, 0.2 Normal, 3.8 L, Amber Poly (1 per EA)Learn More$43.05
- Sodium Hydroxide, 10% w/v Solution, 3.8 LSKU: S1009-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsCaustic Soda (1 per EA)Learn More$42.20
- Sodium Hydroxide, 0.1 Normal, 3.8 L, Poly GallonSKU: S1027-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsN/10 (0.1 M) (1 per EA)Learn More$34.75
- Sodium Sulfite, 1 Molar, 1 L, Amber GlassSKU: S1036-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsDisodium Sulfite, Anhydrous; Sulfurous Acid, Disodium Salt (1 per EA)Learn More$28.35
- Sulfuric Acid, 0.94 Normal, 1 L, PolySKU: S1060-1L-EAManufacturer: 710 Spirits Rocky Mtn Reagents0.47 M (1 per EA)Learn More$20.85
- Sulfuric Acid, 20% v/v Solution, 3.8 LSKU: S1065-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsSulfuric Acid, 20% v/v Solution, 3.8 L (1 per EA)Learn More$47.30
- Sodium Carbonate, 1 Normal, 1 L, PolySKU: S1095-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsN/1 (0.5 M) (1 per EA)Learn More$22.50
- Sulfuric Acid, 0.2 Normal, 1 L, PolySKU: S1113-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsN/5 (0.1 M) (1 per EA)Learn More$20.30
- Sulfuric Acid, 2 Normal, 1 L, PolySKU: S1114-1L-EAManufacturer: 710 Spirits Rocky Mtn Reagents1 M (1 per EA)Learn More$21.50
- Sodium Chromate, 20% w/v Solution, 120 mL, Poly w/ FliptopSKU: S1117-120mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsChromic Acid, Disodium Salt, Tetrahydrate (1 per EA)Learn More$43.90
- Sodium Hydroxide, 20% w/v Solution, 3.8 LSKU: S1126-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsCaustic Soda (1 per EA)Learn More$54.15
- Starch Indicator, 1% w/w Aqueous, 500 mL, PolySKU: S1228-500mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsStarch Indicator, 1% w/w Aqueous, 500 mL, Poly (1 per EA )Learn More$22.55
- Terry's Polychrome Methylene Blue, 470 mLSKU: T1000-470mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsTerry's Polychrome Methylene Blue, 470 mL (1 per EA)Learn More$17.20
- Acetic Acid, 20% v/v Solution, 20 L, CubitainerSKU: A1008-20L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsAcetic Acid, 20% v/v Solution, 20 L, Cubitainer (1 per EA )Learn More$160.90
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Acetic Acid, 50% v/v Solution, 3.8 LSKU: A1009-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsAcetic Acid, 50% v/v Solution, 3.8 L (1 per EA)Learn More$85.35 - Bromocresol Green/Methyl Red, 0.1% w/v in Denatured Ethanol, 3.8 LSKU: B1007-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentspH 4.6 (pink) - pH 5.2 (green-blue) (1 per EA)Learn More$113.95
- Bromocresol Purple, 0.1% w/v Solution, 3.8 LSKU: B1009-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentspH 5.2 (yellow) - pH 6.8 (purple) (1 per EA)Learn More$59.50
- Bromocresol Purple, 0.1% w/v in Denatured Ethanol, 3.8 LSKU: B1010-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentspH 5.2 (yellow) - pH 6.8 (purple) (1 per EA)Learn More$112.45
- Benedict's Reagent, 3.8 LSKU: B1025-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsQualitative for Detection of Sugar (1 per EA)Learn More$72.25
- Bromocresol Green/Methyl Red, 0.1% w/v Solution, 3.8 LSKU: B1032-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentspH 4.6 (pink) - pH 5.2 (green-blue) (1 per EA)Learn More$63.75
- Manufacturer 710 Spirits Rocky Mtn Reagents Remove This Item
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