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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Ammonia TS 2 - 100mLSKU: TS14026-100ml-EAManufacturer: Dawn ScientificAmmonia TS 2 - 100mL (1 per EA )Learn Morewas $69.62 Special Price $67.88 - Ammonium Molybdate TS - 500mLSKU: TS14038-500ml-EAManufacturer: Dawn ScientificAmmonium Molybdate TS - 500mL (1 per EA )Learn Morewas $149.62 Special Price $145.88
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Potassium Bromate-Bromide 0.0247 N, 4.00 L Opaque polySKU: CP204700-4QP-EAManufacturer: Reagents IncPotassium Bromate-Bromide 0.0247 N, 4.00 L Opaque poly (1 per EA )Learn Morewas $230.00 Special Price $172.80 -
Sodium Thiocyanate, SVS Concentrate, To Prepare 0.1 N Solution, 1UNIT, CAS# 540-72-7SKU: SV258-1UNIT-EAManufacturer: Spectrum ChemicalSodium Thiocyanate, SVS Concentrate, To Prepare 0.1 N Solution - Spectrum's Standard Volumetric Solution (SVS) concentrate when diluted to 1 liter will yield a 0.1 N solution. Simply dilute the desired Standard Volumetric Solution concentrate to the specified volume (carefully following instructions provided with the package) and the resulting solution will have an exact Normality within 0.1%. Spectrum Standard Volumetric Solution concentrates are relied upon for fast, accurate results in life sciences and pharmaceutical quality control applications. (1 per EA )Learn More$123.05 - Buffer, Hydrion(R), Dry, pH 9.00 +/- 0.02SKU: B1738-1PK-EAManufacturer: Spectrum ChemicalBuffer, Hydrion(R), Dry, pH 9.00 +/- 0.02 - This product contains 5 envelopes in glass bottle and each envelope is triple-layered to keep buffer completely dry and free-flowing. Hydrion is a registered trademark of Micro Essential Laboratory, Inc. and is reconstituted to a precise buffer solution by dissolving contents of envelope in 500 mL distilled water. (1 per EA )Learn More$97.15
- EDTA Disodium Salt, SVS Concentrate, To Prepare 0.02 N Solution, 1UNIT, CAS# 6381-92-6SKU: SV055-1UNIT-CSManufacturer: Spectrum ChemicalEDTA Disodium Salt, SVS Concentrate, To Prepare 0.02 N Solution is also referred to as Ethylenediaminetetraacetic acid. It is a solid that has no color and is water soluble. It is mainly used as a complexing agent for the dissolution of metal ions in fields such as medicine, industry, cosmetics and laboratories. (6 per CS )Learn More$344.40
- Sodium Carbonate, SVS Concentrate, To Prepare 0.1 N Solution, 1UNIT, CAS# 497-19-8SKU: SV215-1UNIT-CSManufacturer: Spectrum ChemicalSodium Carbonate, SVS Concentrate, To Prepare 0.1 N Solution (6 per CS )Learn More$653.70
- PAGE, 8 Percent Solution, Electrophoresis GradeSKU: P1039-100ML-EAManufacturer: Spectrum ChemicalPAGE, 8 Percent Solution, Electrophoresis Grade (1 per EA )Learn More$294.10
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Vario Silica Hr Acid Reagent, F25 100 Pack, Ea/1SKU: 531930-EAManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 104299. (1 per EA )Learn More$58.55 - Vario Molybdenum Hr 2, F25 100 Pack, Ea/1SKU: 530790-EAManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 1414869. (1 per EA )Learn More$56.16
- Sodium Hydroxide, 0.125 N, 4.00 L Poly naturalSKU: CS006100-4A-EAManufacturer: Reagents IncSodium Hydroxide, 0.125 N, 4.00 L Poly natural (1 per EA )Learn Morewas $102.00 Special Price $76.68
- Barium Chloride, 32% w/v, 4.00 L Poly naturalSKU: CB111300-4A-EAManufacturer: Reagents IncBarium Chloride, 32% w/v, 4.00 L Poly natural (1 per EA )Learn Morewas $199.00 Special Price $149.04
- Potassium Chloride, 3 M (3 N), 120.00 mL Poly naturalSKU: CP183000-120A-EAManufacturer: Reagents IncPotassium Chloride, 3 M (3 N), 120.00 mL Poly natural (1 per EA )Learn Morewas $30.00 Special Price $22.68
- Ascorbic Acid, 12.00 K Poly pailSKU: C2144800-12A5-EAManufacturer: Reagents IncAscorbic Acid, 12.00 K Poly pail (1 per EA )Learn Morewas $1,550.00 Special Price $1,162.08
- Hyamine Solution, 0.004 M (N), 500.00 mL Poly naturalSKU: CH114700-500A-EAManufacturer: Reagents IncHyamine Solution, 0.004 M (N), 500.00 mL Poly natural (1 per EA )Learn Morewas $119.00 Special Price $89.64
- Silver Nitrate, 0.282 N, 1.00 L Glass amberSKU: CS150800-1C-EAManufacturer: Reagents IncSilver Nitrate, 0.282 N, 1.00 L Glass amber (1 per EA )Learn Morewas $591.00 Special Price $442.80
- Acetic Acid, 10% v/v, 500.00 mL Poly naturalSKU: CA008900-500A-EAManufacturer: Reagents IncAcetic Acid, 10% v/v, 500.00 mL Poly natural (1 per EA )Learn Morewas $42.00 Special Price $31.32
- Pot Hydroxide, 0.1 N in MeOH, 20.00 L Winpak blueSKU: C7285050-20E7-EAManufacturer: Reagents IncPot Hydroxide, 0.1 N in MeOH, 20.00 L Winpak blue (1 per EA )Learn Morewas $388.00 Special Price $290.52
- Buffer, pH 1.68, 4.00 L CubitainerSKU: C2115168-4F-EAManufacturer: Reagents IncBuffer, pH 1.68, 4.00 L Cubitainer (1 per EA )Learn Morewas $100.00 Special Price $74.52
- Sulfuric Acid, 0.2 N, 10.00 L CubitainerSKU: C7305520-10F-EAManufacturer: Reagents IncSulfuric Acid, 0.2 N, 10.00 L Cubitainer (1 per EA )Learn Morewas $170.00 Special Price $127.44
- Sodium Hydroxide, 0.5 N, 20.00 L CubitainerSKU: C7318250-20F-EAManufacturer: Reagents IncSodium Hydroxide, 0.5 N, 20.00 L Cubitainer (1 per EA )Learn Morewas $217.00 Special Price $163.08
- Acetic Acid, 2% w/v, 1.00 L Poly naturalSKU: CA203400-1A-EAManufacturer: Reagents IncAcetic Acid, 2% w/v, 1.00 L Poly natural (1 per EA )Learn Morewas $52.00 Special Price $38.88
- Sodium Thiosulfate, 0.01 N, 500.00 mL Poly naturalSKU: CS000100-500A-EAManufacturer: Reagents IncSodium Thiosulfate, 0.01 N, 500.00 mL Poly natural (1 per EA )Learn Morewas $32.00 Special Price $23.76
- Iron Indicator Solution, 4.00 L Glass amberSKU: CI001300-4C-EAManufacturer: Reagents IncIron Indicator Solution, 4.00 L Glass amber (1 per EA )Learn Morewas $182.00 Special Price $136.08
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4L Yellow Buffer Solution pH 7.0 @ 25°C, Poly Bottle
was $74.64 Special Price $21.46
LPS 200uL Universal Pipet Tips, Yellow, Bulk, PK1000
was $20.00 Special Price $15.75
BEAD BATH 20 L, 120 V, TYPE B PLUG, Liters/EA: 20
was $1,794.65 Special Price $1,714.78
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