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 Bromide, 25% w/v Solution, 1 L, PolySKU: P1032-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsPotassium Bromide, 25% w/v Solution, 1 L, Poly (1 per EA)Learn More$41.10 - Sodium Hydroxide, 2 Normal, 1 L, PolySKU: S1029-1L-EAManufacturer: 710 Spirits Rocky Mtn Reagents2 M (1 per EA)Learn More$23.80
- Sodium Hydroxide, 0.01 Normal, 1 L, PolySKU: S1081-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsN/100 (0.01 M) (1 per EA)Learn More$20.40
- Sulfo Orange Indicator, 0.1% w/v Aqueous, 120 mLSKU: S1100-120mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsSulfo Orange Indicator, 0.1% w/v Aqueous, 120 mL (1 per EA)Learn More$18.25
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Starch Indicator, 2% w/v Solution, 3.8 LSKU: S1134-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsPotato Starch; Stabilized with Salicylic Acid (1 per EA)Learn More$46.55 - Iodine, 0.0156 Normal, 3.8 L, Amber GlassSKU: I1015-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsIodine, 0.0156 Normal, 3.8 L, Amber Glass (1 per EA)Learn More$61.90
- Potassium Chromate, 20% w/v Solution, 500 mL, PolySKU: P1003-500mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsPotassium Chromate, 20% w/v Solution, 500 mL, Poly (1 per EA)Learn More$62.55
- Phenosafranin, 0.1% w/v in Isopropanol, 500 mLSKU: P1114-500mL-EAManufacturer: 710 Spirits Rocky Mtn Reagents3,7-Diamino-5-phenylphenazinium Chloride (1 per EA)Learn More$126.05
- pH 4.00 Calibration Buffer, Red, 20 LSKU: P1001-20L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsNIST Traceable; pH = 4.00 ? 0.01 @ 25 ?C (1 per EA)Learn More$85.40
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Acetate Buffer pH 4.0, For Chlorine, Iodine, 20L, Cubitainer®SKU: LC100305-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $659.30 Special Price $494.48 -
PAGE, 4 Percent Solution, Electrophoresis GradeSKU: P1031-500ML-EAManufacturer: Spectrum ChemicalPAGE, 4 Percent Solution, Electrophoresis Grade (1 per EA )Learn More$619.95 -
Tetra-n-butylammonium Hydroxide, 1.0 M Aqueous Solution, 500mL, CAS# 2052-49-5SKU: T1059-500MLGL-EAManufacturer: Spectrum ChemicalTetra-n-butylammonium Hydroxide, 1.0 M Aqueous Solution is a chemical compound that is frequently used as a strong base in organic chemistry and is used under phase-transfer conditions to effect alkylation and deprotonation. (1 per EA )Learn More$1,785.45 - Sulfuric Acid, 6 Normal, 1 L, PolySKU: CF1241-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsSulfuric Acid, 6 Normal, 1 L, Poly (1 per EA )Learn More$41.15
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Iodine, 0.1 Normal, 1 L, Amber GlassSKU: I1010-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsN/10 (0.05 M) (1 per EA)Learn More$30.95 - Mercuric Nitrate, 0.01 Normal, 1 L, Amber GlassSKU: M1007-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsN/100 (0.005 M) (1 per EA)Learn More$48.50
- Sodium Hydroxide, 10 Normal, 1 L, PolySKU: S1031-1L-EAManufacturer: 710 Spirits Rocky Mtn Reagents10 M (1 per EA)Learn More$34.85
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Phosphoric Acid, 85%, Technical, CAS# 7664-38-2SKU: P1026-1gal-EAManufacturer: 710 Spirits Rocky Mtn ReagentsAssay: 85.0% Minimum; Concentration: ?44 N; o-Phosphoric Acid; White Phosphoric Acid (1 per EA)Learn More$59.95 -
Lithium Diisopropylamide, 2 M Solution in Tetrahydrofuran / Heptane / Ethylbenzene, 500mL, CAS# 8002-43-5SKU: L2005-100ML-EAManufacturer: Spectrum ChemicalLithium Diisopropylamide, 2 M Solution in Tetrahydrofuran / Heptane / Ethylbenzene, also known as LDA, is used as a strong base. 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 More$199.11 - Potassium Hydroxide, 0.1N (0.1M) In Methanol, 20L, Cubitainer®SKU: LC195005-EAManufacturer: LabChemShelf Life (months): 18, Traceable to NIST, UN Number: UN1993 (1 per EA)Learn Morewas $611.00 Special Price $458.25
- Potassium Hydroxide, 0.1N (0.1M), 20L, Cubitainer®SKU: LC193005-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $345.50 Special Price $259.12
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Permanganate Reagent (25 mL sample, 1 drop = 100 ppm NaNO₂), 2 ozSKU: R-0730-C-EAManufacturer: Taylor TechnologiesPermanganate Reagent (25 mL sample, 1 drop = 100 ppm NaNO₂), 2 oz (1 per EA)Learn Morewas $11.50 Special Price $8.79 -
Methyl Red Indicator, 2 ozSKU: R-1003F-C-EAManufacturer: Taylor TechnologiesMethyl Red Indicator, 2 oz (1 per EA)Learn Morewas $18.31 Special Price $13.99 -
Silver Nitrate, 0.171 N Standardized Solution, 500mL, CAS# 7761-88-8SKU: S-166-500ML-EAManufacturer: Spectrum ChemicalSilver Nitrate, 0.171 N Standardized Solution (1 per EA )Learn Morewas $217.25 Special Price $176.77 -
Carboxymethylcellulose Sodium, Medium Viscosity, Viscosity of 2 Percent Aqueous Solution @ 25 DEG C: 400-800 cP, USP4-32-4SKU: CA192-500GM-EAManufacturer: Spectrum ChemicalCarboxymethylcellulose Sodium, Medium Viscosity, Viscosity of 2 Percent Aqueous Solution @ 25 DEG C: 400-800 cP, USP is often used as a thickener and stabilizer. All Spectrum Chemical USP grade products are manufactured, packaged and stored under current Good Manufacturing Practices (cGMP). (1 per EA)Learn Morewas $384.80 Special Price $284.64
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