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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Pot Hydroxide, 0.02 N in MeOH, 1.00 L Poly naturalSKU: CP199400-1A-EAManufacturer: Reagents IncPot Hydroxide, 0.02 N in MeOH, 1.00 L Poly natural (1 per EA )Learn Morewas $109.00 Special Price $82.08 - Sodium Chloride, 5% w/v, 1.00 L Poly naturalSKU: CS404600-1A-EAManufacturer: Reagents IncSodium Chloride, 5% w/v, 1.00 L Poly natural (1 per EA )Learn Morewas $58.00 Special Price $43.20
- Sodium Hydroxide, 0.28 N, 20.00 L CubitainerSKU: CS007000-20F-EAManufacturer: Reagents IncSodium Hydroxide, 0.28 N, 20.00 L Cubitainer (1 per EA )Learn Morewas $211.00 Special Price $158.76
- Boric Acid, 4% w/v Indicating, 20.00 L CubitainerSKU: C7104300-20F-EAManufacturer: Reagents IncBoric Acid, 4% w/v Indicating, 20.00 L Cubitainer (1 per EA )Learn Morewas $243.00 Special Price $182.52
- Methanol, 10% w/v, 500.00 mL Glass amberSKU: CM002700-500C-EAManufacturer: Reagents IncMethanol, 10% w/v, 500.00 mL Glass amber (1 per EA )Learn Morewas $33.00 Special Price $24.84
- Hardness Indicator (Dry), 500.00 g Glass amb wmSKU: CH115500-500C2-EAManufacturer: Reagents IncHardness Indicator (Dry), 500.00 g Glass amb wm (1 per EA )Learn Morewas $114.00 Special Price $85.32
- Silver Nitrate, 0.0171 N, 500.00 mL Glass amberSKU: CS003900-500C-EAManufacturer: Reagents IncSilver Nitrate, 0.0171 N, 500.00 mL Glass amber (1 per EA )Learn Morewas $34.50 Special Price $25.92
- Potassium Permanganate, 0.2 N, 4.00 L Glass amberSKU: CP208500-4C-EAManufacturer: Reagents IncPotassium Permanganate, 0.2 N, 4.00 L Glass amber (1 per EA )Learn Morewas $110.00 Special Price $82.08
- Starch Indicator, 2% w/v, 4.00 L Poly naturalSKU: CS001600-4A-EAManufacturer: Reagents IncStarch Indicator, 2% w/v, 4.00 L Poly natural (1 per EA )Learn Morewas $151.00 Special Price $113.40
- Buffer, pH 6.86, 1.00 L Poly naturalSKU: C2155555-1A-EAManufacturer: Reagents IncBuffer, pH 6.86, 1.00 L Poly natural (1 per EA )Learn Morewas $49.00 Special Price $36.72
- Phenolphthalein, 1% /70% SDA, 500.00 mL Poly naturalSKU: CP006400-500A-EAManufacturer: Reagents IncPhenolphthalein, 1% /70% SDA, 500.00 mL Poly natural (1 per EA )Learn Morewas $50.00 Special Price $37.80
- Pot Hydroxide, 0.5 N / Rgt Alc, 4.00 L Poly naturalSKU: CP101400-4A-EAManufacturer: Reagents IncPot Hydroxide, 0.5 N / Rgt Alc, 4.00 L Poly natural (1 per EA )Learn Morewas $280.00 Special Price $209.52
- o-Tolidine Reagent APHA, 500.00 mL Glass amberSKU: CO001100-500C-EAManufacturer: Reagents Inco-Tolidine Reagent APHA, 500.00 mL Glass amber (1 per EA )Learn Morewas $42.50 Special Price $32.40
- Triton X-100™, 0.33% v/v, 20.00 L CubitainerSKU: C7342900-20F-EAManufacturer: Reagents IncTriton X-100™, 0.33% v/v, 20.00 L Cubitainer (1 per EA )Learn Morewas $220.00 Special Price $165.24
- Pot Bromate-Bromide, 0.1 N, 4.00 L Glass amberSKU: C7279000-4C-EAManufacturer: Reagents IncPot Bromate-Bromide, 0.1 N, 4.00 L Glass amber (1 per EA )Learn Morewas $149.00 Special Price $111.24
- Sodium Acetate, 0.1 N / GAA, 10.00 L CubitainerSKU: CS123100-10F-EAManufacturer: Reagents IncSodium Acetate, 0.1 N / GAA, 10.00 L Cubitainer (1 per EA )Learn Morewas $358.00 Special Price $268.92
- Potassium Thiocyanate, 0.1 N, 500.00 mL Glass amberSKU: C7293000-500C-EAManufacturer: Reagents IncPotassium Thiocyanate, 0.1 N, 500.00 mL Glass amber (1 per EA )Learn Morewas $30.00 Special Price $22.68
- Pot Hydroxide, 0.01 N in MeOH, 4.00 L Poly naturalSKU: CP199300-4A-EAManufacturer: Reagents IncPot Hydroxide, 0.01 N in MeOH, 4.00 L Poly natural (1 per EA )Learn Morewas $248.00 Special Price $185.76
- Hydrochloric Acid, 0.2N/RgtAlc, 1.00 L Glass amberSKU: CH117900-1C-EAManufacturer: Reagents IncHydrochloric Acid, 0.2N/RgtAlc, 1.00 L Glass amber (1 per EA )Learn Morewas $57.00 Special Price $43.20
- Hydrochloric Acid 1 N, 10.00 L CubitainerSKU: CH120300-10F-EAManufacturer: Reagents IncHydrochloric Acid 1 N, 10.00 L Cubitainer (1 per EA )Learn Morewas $183.00 Special Price $137.16
- Silver Nitrate 0.01 N in IPA, 4.00 L Glass amberSKU: CS402000-4C-EAManufacturer: Reagents IncSilver Nitrate 0.01 N in IPA, 4.00 L Glass amber (1 per EA )Learn Morewas $396.00 Special Price $297.00
- Pot Hydroxide/Methanol/Hexane, 4.00 L Glass amberSKU: CP117200-4C-EAManufacturer: Reagents IncPot Hydroxide/Methanol/Hexane, 4.00 L Glass amber (1 per EA )Learn Morewas $424.00 Special Price $317.52
- Potassium Permanganate, 0.08 N, 4.00 L Glass amberSKU: CP207700-4C-EAManufacturer: Reagents IncPotassium Permanganate, 0.08 N, 4.00 L Glass amber (1 per EA )Learn Morewas $107.00 Special Price $79.92
- Phenolphthalein Indr for FFA, 4.00 L Poly naturalSKU: CP107600-4A-EAManufacturer: Reagents IncPhenolphthalein Indr for FFA, 4.00 L Poly natural (1 per EA )Learn Morewas $119.00 Special Price $89.64
- Manufacturer Reagents Inc Remove This Item
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