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, 5.0 N Solution, 55gal, CAS# 7647-01-0SKU: H-106-55GLBL-EAManufacturer: Spectrum ChemicalHydrochloric Acid, 5.0 N Solution is a colorless, clear, highly corrosive, highly pungent solution of hydrogen chloride in water. As an monoprotic acid and one of the six common strong mineral acids it is the least likely to be subject to an oxidation-reduction reaction. Hydrochloric acid is frequently used during chemical analysis to prepare samples for analysis. It reacts with basic compounds, turning them into dissolved chlorides that can then undergo analysis. (1 per EA )Learn More$2,199.10 -
Hydrogen Peroxide, 50 Percent, Solution, Reagent, 500mL, CAS# 7722-84-1SKU: H1077-500MLPL-EAManufacturer: Spectrum ChemicalHydrogen Peroxide, 50 Percent, Solution, Reagent - 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 $469.45 Special Price $382.00 -
Magnesium Chloride Reagent, 2 oz, Dropper BottleSKU: R-0755-C-EAManufacturer: Taylor TechnologiesMagnesium Chloride Reagent, 2 oz, Dropper Bottle (1 per EA)Learn Morewas $24.73 Special Price $18.89 -
Nitric Acid Technical 42 Baume, 600.00 lb DrumSKU: C5101700-600LB-EAManufacturer: Reagents IncNitric Acid Technical 42 Baume, 600.00 lb Drum (1 per EA )Learn Morewas $2,830.00 Special Price $2,122.20 -
Phenolphthalein Indicator, 16 ozSKU: R-0638-E-EAManufacturer: Taylor TechnologiesPhenolphthalein Indicator, 16 oz (1 per EA)Learn Morewas $18.39 Special Price $14.04 -
Ferroin Indicator, 100 mLSKU: F1005-100mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsOxidation - Reduction Indicator (1 per EA)Learn More$26.20 - Acetonitrile/Water, 85/15 HPLC, 4.00 L Glass amberSKU: CA109400-4C-EAManufacturer: Reagents IncAcetonitrile/Water, 85/15 HPLC, 4.00 L Glass amber (1 per EA )Learn Morewas $557.00 Special Price $417.96
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Sodium Thiosulfate, 0.0394N (0.0394M), 4L, Poly BottleSKU: LC250404-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $117.90 Special Price $90.70 -
STE Buffer 1X Solution, Sodium Chloride-TRIS-EDTA, 500 MillilitersSKU: S24200-500.0-EAManufacturer: Research Products InternationalMol. Wt: Common Name: Sodium Chloride-TRIS-EDTA Formula: Dimensions: 3.50 x 8.50 x 3.50 Weight: 2.4 - Research or further manufacturing use only, not for food or drug use. (1 per EA)Learn More$129.15 -
Sulfuric Acid 10% W/W, 10L, Cubitainer®SKU: LC255906-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2796 (1 per EA)Learn Morewas $160.20 Special Price $123.25 -
Ammonium Sulfide Solution, Reagent, ACS, 500mL, CAS# 12135-76-1SKU: A1404-500MLGL-EAManufacturer: Spectrum ChemicalAmmonium Sulfide Solution, Reagent, ACS is an unstable salt with the formula (NH4)2S. Common uses of AMMONIUM SULFIDE are industrial applications including photo developing and textile manufacturing. As an ACS grade quality reagent, its chemical specifications are the de facto standards for chemicals used in many high-purity applications and typically designate the highest quality chemical available for laboratory use. Spectrum Chemical manufactured Reagent ACS grade products meet the toughest regulatory standards for quality and purity. (1 per EA )Learn Morewas $416.90 Special Price $246.72 -
Ammonium Bifluoride, 10% w/v Solution, 500 mL, PolySKU: A1025-500mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsAmmnonium Hydrogendifluoride (1 per EA)Learn More$17.80 -
Phosphotungstic Acid TS - 100mLSKU: TS14207-100ml-EAManufacturer: Dawn ScientificPhosphotungstic Acid TS - 100mL (1 per EA )Learn Morewas $43.62 Special Price $42.53 -
Vario Sulfuric Acid, 5.25 N 100 MLSKU: R-5010-2-EAManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 244932. Lovibond Vario Sulfuric Acid, 5.25 N, 100 ml (1 per EA)Learn More$18.86 - Bromocresol Green Indicator, 0.1% w/v Aqueous, 500 mLSKU: B1031-500mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentspH 3.8 (yellow) - pH 5.4 (blue) (1 per EA)Learn More$23.35
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Thymol Blue Indicator, .75 ozSKU: R-1003M-A-EAManufacturer: Taylor TechnologiesThymol Blue Indicator, .75 oz (1 per EA)Learn Morewas $12.95 Special Price $9.89 -
Potassium Antimony Tartrate Solution, 500ML, Poly BottleSKU: LC187201-EAManufacturer: LabChemShelf Life (months): 6, , UN Number: (1 per EA)Learn Morewas $62.10 Special Price $46.58 -
Potassium Iodate-Iodide, 0.0125N (0.002083M), 1L, Amber PolySKU: LC196602-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $68.90 Special Price $51.68 - Chromic Acid 10% W/V, 500ML, Poly BottleSKU: LC131001-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1755 (1 per EA)Learn Morewas $73.80 Special Price $55.35
- Hydrochloric Acid, 0.12 N Unst, 15.00 gal DrumSKU: CH122600-15E-EAManufacturer: Reagents IncHydrochloric Acid, 0.12 N Unst, 15.00 gal Drum (1 per EA )Learn Morewas $265.00 Special Price $198.72
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Nitric Acid 10% V/V, 1L, Amber GlassSKU: LC177302-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2031 (1 per EA)Learn Morewas $73.00 Special Price $54.75 -
QAC Titrating Solution (hi range), 2 oz, Dropper BottleSKU: R-0884-C-EAManufacturer: Taylor TechnologiesQAC Titrating Solution (hi range), 2 oz, Dropper Bottle (1 per EA)Learn Morewas $38.95 Special Price $29.75 - Sodium Hydroxide 40% W/W, 4L, Poly BottleSKU: LC241204-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $93.60 Special Price $72.01
- Acetic Acid 1% V/V (1+99), 500ML, Poly BottleSKU: LC101201-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $39.10 Special Price $29.32
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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
4L Yellow Buffer Solution pH 7.0 @ 25°C, Poly Bottle
was $74.64 Special Price $21.46
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