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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Phenolphthalein TS, 100.00 mL Poly naturalSKU: CP260700-100A-EAManufacturer: Reagents IncPhenolphthalein TS, 100.00 mL Poly natural (1 per EA )Learn Morewas $24.50 Special Price $18.36 - Sodium Hydroxide, 1.25 N, 4.00 L Poly naturalSKU: CS010100-4A-EAManufacturer: Reagents IncSodium Hydroxide, 1.25 N, 4.00 L Poly natural (1 per EA )Learn Morewas $106.00 Special Price $79.92
- Lanthanum Solution, APHA, 4.00 L Poly naturalSKU: CL151000-4A-EAManufacturer: Reagents IncLanthanum Solution, APHA, 4.00 L Poly natural (1 per EA )Learn Morewas $754.00 Special Price $565.92
- Sod Tetraphenylboron, 0.0025 M, 500.00 mL Poly naturalSKU: CS138100-500A-EAManufacturer: Reagents IncSod Tetraphenylboron, 0.0025 M, 500.00 mL Poly natural (1 per EA )Learn Morewas $34.00 Special Price $25.92
- Sodium Hydroxide, 0.12 M Unstd, 200.00 L DrumSKU: CS006900-200E-EAManufacturer: Reagents IncSodium Hydroxide, 0.12 M Unstd, 200.00 L Drum (1 per EA )Learn Morewas $555.00 Special Price $415.80
- Sodium Nitrate, 5 M, 500.00 mL Poly naturalSKU: CS032300-500A-EAManufacturer: Reagents IncSodium Nitrate, 5 M, 500.00 mL Poly natural (1 per EA )Learn Morewas $90.00 Special Price $68.04
- Buffer, pH 1.00, 1.00 L Poly naturalSKU: C2155100-1A-EAManufacturer: Reagents IncBuffer, pH 1.00, 1.00 L Poly natural (1 per EA )Learn Morewas $49.00 Special Price $36.72
- Sodium Thiosulfate, 0.282 N, 20.00 L CubitainerSKU: CS126500-20F-EAManufacturer: Reagents IncSodium Thiosulfate, 0.282 N, 20.00 L Cubitainer (1 per EA )Learn Morewas $371.00 Special Price $278.64
- Mercuric Chloride, 0.2 M, 1.00 L Glass amberSKU: CM102700-1C-EAManufacturer: Reagents IncMercuric Chloride, 0.2 M, 1.00 L Glass amber (1 per EA )Learn Morewas $770.00 Special Price $577.80
- Sulfosalicylic Acid, 20% w/v, 1.00 L Glass amberSKU: CS132900-1C-EAManufacturer: Reagents IncSulfosalicylic Acid, 20% w/v, 1.00 L Glass amber (1 per EA )Learn Morewas $178.00 Special Price $133.92
- Sodium Chloride, 0.1%, 1.00 L Poly naturalSKU: CS404200-1A-EAManufacturer: Reagents IncSodium Chloride, 0.1%, 1.00 L Poly natural (1 per EA )Learn Morewas $82.00 Special Price $61.56
- Pot Hydroxide, 5% w/v in SDA, 1.00 L Poly naturalSKU: CP118700-1A-EAManufacturer: Reagents IncPot Hydroxide, 5% w/v in SDA, 1.00 L Poly natural (1 per EA )Learn Morewas $89.00 Special Price $66.96
- Sodium Hydroxide, 20% w/v, 20.00 L CubitainerSKU: CS101000-20F-EAManufacturer: Reagents IncSodium Hydroxide, 20% w/v, 20.00 L Cubitainer (1 per EA )Learn Morewas $252.00 Special Price $189.00
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Bromothymol Blue TS - 500mLSKU: TS14065-500ml-EAManufacturer: Dawn ScientificBromothymol Blue TS - 500mL (1 per EA )Learn Morewas $159.62 Special Price $155.63 - Ammonium Chloride-Ammonium Hydroxide TS - 100mLSKU: TS14037-100ml-EAManufacturer: Dawn ScientificAmmonium Chloride-Ammonium Hydroxide TS - 100mL (1 per EA )Learn Morewas $44.62 Special Price $43.50
- Potassium Iodide 5% w/v, 4.00 L Black polySKU: CP600100-4BP-EAManufacturer: Reagents IncPotassium Iodide 5% w/v, 4.00 L Black poly (1 per EA )Learn Morewas $138.00 Special Price $103.68
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Sodium Carboxymethylcellulose, (Viscosity of 2 Percent Aqueous Solution @ 25 DEG C: 34.0-50.0 cP), USP4-32-4SKU: C4622-100GM-EAManufacturer: Spectrum ChemicalSodium Carboxymethylcellulose, (Viscosity of 2 Percent Aqueous Solution @ 25 DEG C: 34.0-50.0 cP), USP4-32-4 (1 per EA )Learn Morewas $129.00 Special Price $95.43 - Copper Sulfate, 0.01 M, 20.00 L CubitainerSKU: CC200400-20F-EAManufacturer: Reagents IncCopper Sulfate, 0.01 M, 20.00 L Cubitainer (1 per EA )Learn Morewas $436.00 Special Price $327.24
- Potassium Fluoride, 50% w/v, 1.00 L Poly naturalSKU: CP002300-1A-EAManufacturer: Reagents IncPotassium Fluoride, 50% w/v, 1.00 L Poly natural (1 per EA )Learn Morewas $284.00 Special Price $212.76
- Phosphoric Acid, 10% w/v, 4.00 L Poly naturalSKU: CP103300-4A-EAManufacturer: Reagents IncPhosphoric Acid, 10% w/v, 4.00 L Poly natural (1 per EA )Learn Morewas $103.00 Special Price $77.76
- Ammonium Chloride, 10% w/v, 4.00 L Poly naturalSKU: CA005200-4A-EAManufacturer: Reagents IncAmmonium Chloride, 10% w/v, 4.00 L Poly natural (1 per EA )Learn Morewas $93.00 Special Price $70.20
- Buffer, pH 1.68, 20.00 L CubitainerSKU: C2115168-20F-EAManufacturer: Reagents IncBuffer, pH 1.68, 20.00 L Cubitainer (1 per EA )Learn Morewas $187.00 Special Price $140.40
- Acid Dichromate Cleaning Soln, 4.00 L glass sc ambSKU: CA013400-4C1-EAManufacturer: Reagents IncAcid Dichromate Cleaning Soln, 4.00 L glass sc amb (1 per EA )Learn Morewas $273.00 Special Price $205.20
- Starch-Iodide Solution, 4.00 L Poly naturalSKU: CS000600-4A-EAManufacturer: Reagents IncStarch-Iodide Solution, 4.00 L Poly natural (1 per EA )Learn Morewas $117.00 Special Price $87.48
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