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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Hydrochloric Acid, 3 N, 1.00 L Poly naturalSKU: CH103200-1A-EAManufacturer: Reagents IncHydrochloric Acid, 3 N, 1.00 L Poly natural (1 per EA )Learn Morewas $48.00 Special Price $35.64 - Ammonium Thiocyanate, 10% w/v, 1.00 L Glass amberSKU: CA100800-1C-EAManufacturer: Reagents IncAmmonium Thiocyanate, 10% w/v, 1.00 L Glass amber (1 per EA )Learn Morewas $96.00 Special Price $72.36
- TISAB II, for Fluoride ISE, 20.00 L CubitainerSKU: C7340210-20F-EAManufacturer: Reagents IncTISAB II, for Fluoride ISE, 20.00 L Cubitainer (1 per EA )Learn Morewas $674.00 Special Price $505.44
- Phosphoric Acid, 50% v/v (1+1), 4.00 L Poly naturalSKU: CP208900-4A-EAManufacturer: Reagents IncPhosphoric Acid, 50% v/v (1+1), 4.00 L Poly natural (1 per EA )Learn Morewas $155.00 Special Price $116.64
- Acetic Acid, 10% v/v, 20.00 L CubitainerSKU: CA008900-20F-EAManufacturer: Reagents IncAcetic Acid, 10% v/v, 20.00 L Cubitainer (1 per EA )Learn Morewas $348.00 Special Price $261.36
- Starch Indicator, 2% w/v, 500.00 mL Poly naturalSKU: CS001600-500A-EAManufacturer: Reagents IncStarch Indicator, 2% w/v, 500.00 mL Poly natural (1 per EA )Learn Morewas $106.00 Special Price $79.92
- Hydrochloric Acid, 1.5 N, 20.00 L CubitainerSKU: CH122500-20F-EAManufacturer: Reagents IncHydrochloric Acid, 1.5 N, 20.00 L Cubitainer (1 per EA )Learn Morewas $249.00 Special Price $186.84
- Acidic Titration Solvent ASTM, 20.00 L Winpak blueSKU: CA302800-20E7-EAManufacturer: Reagents IncAcidic Titration Solvent ASTM, 20.00 L Winpak blue (1 per EA )Learn Morewas $659.00 Special Price $494.64
- Sulfuric Acid, 25% v/v, 20.00 L CubitainerSKU: C7306100-20F-EAManufacturer: Reagents IncSulfuric Acid, 25% v/v, 20.00 L Cubitainer (1 per EA )Learn Morewas $331.00 Special Price $248.40
- Ammonium Hydroxide, 16.7% v/v, 500.00 mL Poly naturalSKU: CA015200-500A-EAManufacturer: Reagents IncAmmonium Hydroxide, 16.7% v/v, 500.00 mL Poly natural (1 per EA )Learn Morewas $57.00 Special Price $43.20
- Sodium Hydroxide, 1 N, 1.00 L Poly naturalSKU: C7318500-1A-EAManufacturer: Reagents IncSodium Hydroxide, 1 N, 1.00 L Poly natural (1 per EA )Learn Morewas $37.00 Special Price $28.08
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Malachite Green TS - 100mLSKU: TS14152-100ml-EAManufacturer: Dawn ScientificMalachite Green TS - 100mL (1 per EA )Learn Morewas $44.62 Special Price $43.50 - Xylenol Orange TS - 500mLSKU: TS14302-500ml-EAManufacturer: Dawn ScientificXylenol Orange TS - 500mL (1 per EA )Learn Morewas $139.62 Special Price $136.13
- Cupric Iodide TS, Alkaline - 100mLSKU: TS14087-100ml-EAManufacturer: Dawn ScientificCupric Iodide TS, Alkaline - 100mL (1 per EA )Learn Morewas $94.62 Special Price $92.25
- Malachite Green TS - 500mLSKU: TS14152-500ml-EAManufacturer: Dawn ScientificMalachite Green TS - 500mL (1 per EA )Learn Morewas $94.62 Special Price $92.25
- Biuret Reagent TS - 500mLSKU: TS14054-500ml-EAManufacturer: Dawn ScientificBiuret Reagent TS - 500mL (1 per EA )Learn Morewas $69.62 Special Price $67.88
- Sulfomolybic Acid TS - 500mLSKU: TS14284-500ml-EAManufacturer: Dawn ScientificSulfomolybic Acid TS - 500mL (1 per EA )Learn Morewas $93.62 Special Price $91.28
- Alcoholic Phenol TS - 500mLSKU: TS14011-500ml-EAManufacturer: Dawn ScientificAlcoholic Phenol TS - 500mL (1 per EA )Learn Morewas $74.62 Special Price $72.76
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Slide, Chlorine DPD-free, combined, totalSKU: 5157-EAManufacturer: Taylor TechnologiesSlide, Chlorine DPD-free, combined, total (1 per EA )Learn Morewas $1.04 Special Price $0.93 - Indicator VB, 500.00 mL Glass amberSKU: C84009NE-500C-EAManufacturer: Reagents IncIndicator VB, 500.00 mL Glass amber (1 per EA )Learn Morewas $299.00 Special Price $224.64
- Acid Value Soln Indicating, 2.50 L Glass amberSKU: CA040000-2.5C-EAManufacturer: Reagents IncAcid Value Soln Indicating, 2.50 L Glass amber (1 per EA )Learn Morewas $78.00 Special Price $58.32
- Isopropanol 70% v/v USP/NF, 200.00 L DrumSKU: CI296200-200E-EAManufacturer: Reagents IncIsopropanol 70% v/v USP/NF, 200.00 L Drum (1 per EA )Learn Morewas $3,490.00 Special Price $2,617.92
- Nitric Acid 30% v/v, 1.00 L Glass amberSKU: CN200900-1C-EAManufacturer: Reagents IncNitric Acid 30% v/v, 1.00 L Glass amber (1 per EA )Learn Morewas $88.00 Special Price $65.88
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Buffer, Hydrion(R), Dry, pH 9.18 +/- 0.02SKU: B1741-1PK-EAManufacturer: Spectrum ChemicalBuffer, Hydrion(R), Dry, pH 9.18 +/- 0.02 (1 per EA )Learn More$102.65
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