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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Acetone:Alcohol 1:1 Decolorizr, 4.00 L Poly naturalSKU: CA106400-4A-EAManufacturer: Reagents IncAcetone:Alcohol 1:1 Decolorizr, 4.00 L Poly natural (1 per EA )Learn Morewas $356.00 Special Price $266.76 -
Bromophenol Blue TS - 100mLSKU: TS14064-100ml-EAManufacturer: Dawn ScientificBromophenol Blue TS - 100mL (1 per EA )Learn Morewas $45.62 Special Price $44.47 -
Phenolphthalein Indicator 1%, 16 ozSKU: R-0638S-E-EAManufacturer: Taylor TechnologiesPhenolphthalein Indicator 1%, 16 oz (1 per EA )Learn Morewas $33.25 Special Price $29.74 -
Hydrogen Peroxide, 35 Percent Solution, Technical, 200L, CAS# 7722-84-1SKU: H1075-200LTBL-EAManufacturer: Spectrum ChemicalHydrogen Peroxide, 35 Percent Solution, Technical - Ungraded products supplied by Spectrum are indicative of a grade suitable for general industrial use or research purposes and typically are not suitable for human consumption or therapeutic use. (1 per EA )Learn More$2,782.75 -
Potassium Hydroxide, 45 Percent (w/w) Aqueous Solution, Reagent, 4L, CAS# 1310-58-3SKU: P1320-4LTPL-CSManufacturer: Spectrum ChemicalPotassium Hydroxide, 45 Percent (w/w) Aqueous Solution, Reagent is an aqueous solution of Caustic Potash and is the protypical strong base. Its reagent grade means this is the highest quality commercially available for this chemical and that the American Chemical Society has not officially set any specifications for this material. (4 per CS )Learn Morewas $1,447.85 Special Price $1,178.12 - Methanol, 15% v/v HPLC, 4.00 L Glass amberSKU: CM000200-4C-EAManufacturer: Reagents IncMethanol, 15% v/v HPLC, 4.00 L Glass amber (1 per EA )Learn Morewas $177.00 Special Price $132.84
- Starch Indicator, 2% w/v, 1.00 L Poly naturalSKU: CS001600-1A-EAManufacturer: Reagents IncStarch Indicator, 2% w/v, 1.00 L Poly natural (1 per EA )Learn Morewas $50.00 Special Price $37.80
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Tclp Extraction Fluid #2, 10L, Cubitainer®SKU: LC259976-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $175.30 Special Price $134.86 -
Sodium Hydroxide 5% W/V, 1L, Poly BottleSKU: LC240402-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $45.70 Special Price $35.16 -
Sulfuric Acid 72% W/W (24N), 1L, Amber GlassSKU: LC256452-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1830 (1 per EA)Learn Morewas $81.20 Special Price $62.47 - Iodine TS - 100mLSKU: TS14131-100ml-EAManufacturer: Dawn ScientificIodine TS - 100mL (1 per EA )Learn Morewas $69.62 Special Price $67.88
- Barium Chloride, 10% w/v, pH 7, 4.00 L Poly naturalSKU: CB100300-4A-EAManufacturer: Reagents IncBarium Chloride, 10% w/v, pH 7, 4.00 L Poly natural (1 per EA )Learn Morewas $119.00 Special Price $89.64
- Tri-Acid Solution, 4.00 L Poly naturalSKU: CT145500-4A-EAManufacturer: Reagents IncTri-Acid Solution, 4.00 L Poly natural (1 per EA )Learn Morewas $100.00 Special Price $76.93
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Sodium Nitrate, 5M (5N), 4L, Poly BottleSKU: LC246654-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $525.80 Special Price $404.51 -
Hydrogen Bromide, 33 Percent Solution in Acetic Acid, 500mL, CAS# 10035-10-6SKU: H1141-500MLGL-CSManufacturer: Spectrum ChemicalHydrogen Bromide, 33 Percent Solution in Acetic Acid - Ungraded products supplied by Spectrum are indicative of a grade suitable for general industrial use or research purposes and typically are not suitable for human consumption or therapeutic use. (6 per CS )Learn Morewas $2,158.30 Special Price $1,277.24 -
Sodium Hydroxide, 25% w/w Solution, 3.8 LSKU: S1032-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsCaustic Soda (1 per EA)Learn More$65.80 - Sodium Thiosulfate, 0.5N (0.5M), 4L, Poly BottleSKU: LC250804-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $151.80 Special Price $116.78
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Potassium Hydroxide, 10 Percent (w/v), Solution, 4L, CAS# 1310-58-3SKU: P-377-4LTPL-EAManufacturer: Spectrum ChemicalPotassium Hydroxide, 10 Percent (w/v), Solution - Ungraded products supplied by Spectrum are indicative of a grade suitable for general industrial use or research purposes and typically are not suitable for human consumption or therapeutic use. (1 per EA )Learn Morewas $267.45 Special Price $217.63 -
Sodium Hydroxide, 25 Percent (w/v) Solution, 500mL, CAS# 1310-73-2SKU: S-237-500ML-EAManufacturer: Spectrum ChemicalSodium Hydroxide, 25 Percent (w/v) Solution - Ungraded products supplied by Spectrum are indicative of a grade suitable for general industrial use or research purposes and typically are not suitable for human consumption or therapeutic use. (1 per EA )Learn Morewas $54.00 Special Price $43.93 -
Ammonium Sulfide, Light Solution, Reagent, 500mL, CAS# 12135-76-1SKU: A1250-500MLGL-CSManufacturer: Spectrum ChemicalAmmonium Sulfide, Light Solution, Reagent, is an unstable salt with the formula (NH4)2S. It has a very strong odor, and the Reagent grade means it is used in the laboratory as an analytical testing agent. Common uses of AMMONIUM SULFIDE, LIGHT SOLUTION, REAGENT are industrial applications including photo developing, textile manufacturing and others. (6 per CS )Learn Morewas $1,819.50 Special Price $1,076.75 - Zinc Sulfate, 1.180 Spg, 4L, Poly BottleSKU: LC272704-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $182.40 Special Price $140.32
- Turner's Reagent, 1.00 L Glass amberSKU: CT000300-1C-EAManufacturer: Reagents IncTurner's Reagent, 1.00 L Glass amber (1 per EA )Learn Morewas $107.00 Special Price $79.92
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Sodium Chloride, 0.025N (0.025M), 500ML, Poly BottleSKU: LC235501-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $54.60 Special Price $42.01 -
Potassium Hydroxide, 30 Percent (w/v) Electrolyte Solution, 4L, CAS# 1310-58-3SKU: P-385-4LT-EAManufacturer: Spectrum ChemicalPotassium Hydroxide, 30 Percent (w/v) Electrolyte Solution - Ungraded products supplied by Spectrum are indicative of a grade suitable for general industrial use or research purposes and typically are not suitable for human consumption or therapeutic use. (1 per EA )Learn Morewas $141.25 Special Price $114.93
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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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