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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Sulfuric Acid, 0.2 N Solution, 500mL, CAS# 7664-93-9SKU: S-620-500ML-EAManufacturer: Spectrum ChemicalSulfuric Acid, 0.2 N Solution - Spectrum utilizes 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 Morewas $37.25 Special Price $30.32 -
Hydroxylamine HCl, 6% w/v, 10.00 L CubitainerSKU: CH144400-10F-EAManufacturer: Reagents IncHydroxylamine HCl, 6% w/v, 10.00 L Cubitainer (1 per EA )Learn Morewas $1,150.00 Special Price $862.92 - Potassium Hydroxide, 1.3 N, 500.00 mL Poly naturalSKU: CP202500-500A-EAManufacturer: Reagents IncPotassium Hydroxide, 1.3 N, 500.00 mL Poly natural (1 per EA )Learn Morewas $45.00 Special Price $33.48
- Acetic Acid, 50% v/v, 100.00 mL Poly naturalSKU: C7100610-100A-EAManufacturer: Reagents IncAcetic Acid, 50% v/v, 100.00 mL Poly natural (1 per EA )Learn Morewas $39.00 Special Price $29.16
- Brucine Sulfate Solution, 1.00 L Glass amberSKU: CB146000-1C-EAManufacturer: Reagents IncBrucine Sulfate Solution, 1.00 L Glass amber (1 per EA )Learn Morewas $198.00 Special Price $149.04
- Starch, 0.5%, Chloroform pres., 1.00 L Poly naturalSKU: CS001100-1A-EAManufacturer: Reagents IncStarch, 0.5%, Chloroform pres., 1.00 L Poly natural (1 per EA )Learn Morewas $62.00 Special Price $46.44
- Sodium Cyanide, 10% w/v, 1.00 L Poly naturalSKU: C83016NE-1A-EAManufacturer: Reagents IncSodium Cyanide, 10% w/v, 1.00 L Poly natural (1 per EA )Learn Morewas $350.00 Special Price $262.44
- Sulfuric Acid, 10 N, 1.00 L Poly naturalSKU: C7305650-1A-EAManufacturer: Reagents IncSulfuric Acid, 10 N, 1.00 L Poly natural (1 per EA )Learn Morewas $68.50 Special Price $51.84
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Magnsia Mixture TS - 100mLSKU: TS14150-100ml-EAManufacturer: Dawn ScientificMagnsia Mixture TS - 100mL (1 per EA )Learn Morewas $64.62 Special Price $63.01 - Ammonium Molybdate TS - 100mLSKU: TS14038-100ml-EAManufacturer: Dawn ScientificAmmonium Molybdate TS - 100mL (1 per EA )Learn Morewas $69.62 Special Price $67.88
- Potassium Dichromate, 0.200 N, 4L, CAS# 7778-50-9SKU: P-344-4LT-EAManufacturer: Spectrum ChemicalPotassium Dichromate, 0.200 N (1 per EA )Learn Morewas $133.50 Special Price $108.63
- Pot Acid Phthalate, 1000 ppm, 100.00 mL Glass amberSKU: CP080300-100C-EAManufacturer: Reagents IncPot Acid Phthalate, 1000 ppm, 100.00 mL Glass amber (1 per EA )Learn Morewas $33.50 Special Price $24.84
- Sodium Hydroxide, 18% w/w, 10.00 L CubitainerSKU: CS130800-10F-EAManufacturer: Reagents IncSodium Hydroxide, 18% w/w, 10.00 L Cubitainer (1 per EA )Learn Morewas $244.00 Special Price $182.52
- Copper Sulfate, 3% in 3% H2SO4, 4.00 L Poly naturalSKU: CC102700-4A-EAManufacturer: Reagents IncCopper Sulfate, 3% in 3% H2SO4, 4.00 L Poly natural (1 per EA )Learn Morewas $305.00 Special Price $228.96
- o-Tolidine Reagent, 500.00 mL Glass amberSKU: CO000700-500C-EAManufacturer: Reagents Inco-Tolidine Reagent, 500.00 mL Glass amber (1 per EA )Learn Morewas $41.50 Special Price $31.32
- Karl Fischer Solvent, 4.00 L Glass amberSKU: CK105000-4C-EAManufacturer: Reagents IncKarl Fischer Solvent, 4.00 L Glass amber (1 per EA )Learn Morewas $279.00 Special Price $209.52
- Buffer, pH 10.00, Clear, 500.00 mL Poly naturalSKU: C2156510-500A-EAManufacturer: Reagents IncBuffer, pH 10.00, Clear, 500.00 mL Poly natural (1 per EA )Learn Morewas $27.00 Special Price $20.52
- Lactic Acid 85% Purified, 500.00 mL Poly naturalSKU: C2108000-500A-EAManufacturer: Reagents IncLactic Acid 85% Purified, 500.00 mL Poly natural (1 per EA )Learn Morewas $187.00 Special Price $140.40
- Buffer, pH 2.00, 1.00 L Poly naturalSKU: C2155400-1A-EAManufacturer: Reagents IncBuffer, pH 2.00, 1.00 L Poly natural (1 per EA )Learn Morewas $49.00 Special Price $36.72
- Phenolphthalein, 1% /50% Alc, 500.00 mL Poly naturalSKU: CP107400-500A-EAManufacturer: Reagents IncPhenolphthalein, 1% /50% Alc, 500.00 mL Poly natural (1 per EA )Learn Morewas $78.00 Special Price $58.32
- Sodium Thiosulfate, 0.025 N, 4.00 L Poly naturalSKU: C7328050-4A-EAManufacturer: Reagents IncSodium Thiosulfate, 0.025 N, 4.00 L Poly natural (1 per EA )Learn Morewas $102.00 Special Price $76.68
- Sulfuric Acid, 0.01 N, 1.00 L Poly naturalSKU: C7305350-1A-EAManufacturer: Reagents IncSulfuric Acid, 0.01 N, 1.00 L Poly natural (1 per EA )Learn Morewas $36.50 Special Price $27.00
- Sodium Thiosulfate, 0.025 N, 500.00 mL Poly naturalSKU: C7328050-500A-EAManufacturer: Reagents IncSodium Thiosulfate, 0.025 N, 500.00 mL Poly natural (1 per EA )Learn Morewas $28.00 Special Price $20.52
- Ammonia TS - 500mLSKU: TS14025-500ml-EAManufacturer: Dawn ScientificAmmonia TS - 500mL (1 per EA )Learn Morewas $139.62 Special Price $136.13
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