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, 0.3 N, 4.00 L Poly naturalSKU: C7101090-4A-EAManufacturer: Reagents IncHydrochloric Acid, 0.3 N, 4.00 L Poly natural (1 per EA )Learn Morewas $66.00 Special Price $49.68 - Diethylamine, 0.10 N, 4.00 L Glass amberSKU: CD227000-4C-EAManufacturer: Reagents IncDiethylamine, 0.10 N, 4.00 L Glass amber (1 per EA )Learn Morewas $415.00 Special Price $311.04
- Hydrochloric Acid, 0.2 N, 20.00 L CubitainerSKU: C7101020-20F-EAManufacturer: Reagents IncHydrochloric Acid, 0.2 N, 20.00 L Cubitainer (1 per EA )Learn Morewas $197.00 Special Price $147.96
- Potassium Chloride, Saturated, 1.00 L Poly naturalSKU: CP113900-1A-EAManufacturer: Reagents IncPotassium Chloride, Saturated, 1.00 L Poly natural (1 per EA )Learn Morewas $71.00 Special Price $52.92
- Sulfuric Acid, 0.33 N, 10.00 L CubitainerSKU: CS303000-10F-EAManufacturer: Reagents IncSulfuric Acid, 0.33 N, 10.00 L Cubitainer (1 per EA )Learn Morewas $149.00 Special Price $111.24
- Sulfuric Acid, 4.8 N, 20.00 L CubitainerSKU: CS147500-20F-EAManufacturer: Reagents IncSulfuric Acid, 4.8 N, 20.00 L Cubitainer (1 per EA )Learn Morewas $340.00 Special Price $254.88
- Potassium Fluoride, 44% w/v, 4.00 L Poly naturalSKU: CP202900-4A-EAManufacturer: Reagents IncPotassium Fluoride, 44% w/v, 4.00 L Poly natural (1 per EA )Learn Morewas $527.00 Special Price $395.28
- Phenolphthalein, 0.1%/50% MeOH, 500.00 mL Poly naturalSKU: CP108300-500A-EAManufacturer: Reagents IncPhenolphthalein, 0.1%/50% MeOH, 500.00 mL Poly natural (1 per EA )Learn Morewas $99.00 Special Price $74.52
- Cadmium Nitrate, 0.1 N, 4.00 L Poly naturalSKU: CC202000-4A-EAManufacturer: Reagents IncCadmium Nitrate, 0.1 N, 4.00 L Poly natural (1 per EA )Learn Morewas $579.00 Special Price $434.16
- Potassium Bromate, 5 g/L, 10.00 L CubitainerSKU: CP111600-10F-EAManufacturer: Reagents IncPotassium Bromate, 5 g/L, 10.00 L Cubitainer (1 per EA )Learn Morewas $91.00 Special Price $68.04
- Potassium Hydroxide, 10% w/v, 4.00 L Poly naturalSKU: CP116000-4A-EAManufacturer: Reagents IncPotassium Hydroxide, 10% w/v, 4.00 L Poly natural (1 per EA )Learn Morewas $114.00 Special Price $85.32
- Ba Diphenylaminesulfonate 0.1%, 120.00 mL Poly naturalSKU: CB109900-120A-EAManufacturer: Reagents IncBa Diphenylaminesulfonate 0.1%, 120.00 mL Poly natural (1 per EA )Learn Morewas $48.00 Special Price $35.64
- Sodium Sulfite, 1 M, pH 9.5, 10.00 L CubitainerSKU: CS149800-10F-EAManufacturer: Reagents IncSodium Sulfite, 1 M, pH 9.5, 10.00 L Cubitainer (1 per EA )Learn Morewas $107.00 Special Price $79.92
- Phenolphthalein TS, 1.00 L Poly naturalSKU: CP260700-1A-EAManufacturer: Reagents IncPhenolphthalein TS, 1.00 L Poly natural (1 per EA )Learn Morewas $77.00 Special Price $57.24
- Metaphosphoric Acid, 3% w/v, 10.00 L CubitainerSKU: CM103500-10F-EAManufacturer: Reagents IncMetaphosphoric Acid, 3% w/v, 10.00 L Cubitainer (1 per EA )Learn Morewas $3,340.00 Special Price $2,504.52
- Hydrochloric Acid, 0.1 N/IPA, 1.00 L Glass amberSKU: CH103800-1C-EAManufacturer: Reagents IncHydrochloric Acid, 0.1 N/IPA, 1.00 L Glass amber (1 per EA )Learn Morewas $172.00 Special Price $128.52
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Phenol Red TS, ( Alcoholic) - 500mLSKU: TS14198-500ml-EAManufacturer: Dawn ScientificPhenol Red TS, ( Alcoholic) - 500mL (1 per EA )Learn Morewas $69.62 Special Price $67.88 -
Midget, Chlorine OTSKU: 5509-EAManufacturer: Taylor TechnologiesMidget, Chlorine OT (1 per EA )Learn Morewas $1.04 Special Price $0.93 - Ammonium Carbonate TS 2 - 500mLSKU: TS14035-500ml-EAManufacturer: Dawn ScientificAmmonium Carbonate TS 2 - 500mL (1 per EA )Learn Morewas $119.62 Special Price $116.63
- Potassium Carbonate TS - 100mLSKU: TS14214-100ml-EAManufacturer: Dawn ScientificPotassium Carbonate TS - 100mL (1 per EA )Learn Morewas $44.62 Special Price $43.50
- Sodium Sulfide TS - 500mLSKU: TS14265-500ml-EAManufacturer: Dawn ScientificSodium Sulfide TS - 500mL (1 per EA )Learn Morewas $164.62 Special Price $160.51
- Glycrerin Base TS - 500mLSKU: TS14122-500ml-EAManufacturer: Dawn ScientificGlycrerin Base TS - 500mL (1 per EA )Learn Morewas $64.62 Special Price $63.01
- Alkaline Cupric Citrate TS 2 - 100mLSKU: TS14017-100ml-EAManufacturer: Dawn ScientificAlkaline Cupric Citrate TS 2 - 100mL (1 per EA )Learn Morewas $94.62 Special Price $92.25
- Mercurous Nitrate TS - 500mLSKU: TS14163-500ml-EAManufacturer: Dawn ScientificMercurous Nitrate TS - 500mL (1 per EA )Learn Morewas $219.62 Special Price $214.13
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