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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Sodium Hydroxide, 3.0N (3.0M), 500ML, Poly BottleSKU: LC244201-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $42.70 Special Price $32.85 -
Hydrogen Bromide, 33 Percent Solution in Acetic Acid, 1L, CAS# 10035-10-6SKU: H1141-1LTGL-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 $3,464.30 Special Price $2,818.89 -
Manganese Chloride 1M Solution, 50 Milliliters CAS# 7732-18-5, 7773-01-5SKU: M20100-50.0-EAManufacturer: Research Products InternationalMol. Wt: Common Name: Manganese Dichloride Formula: Dimensions: 3.38 x 4.63 x 3.38, Weight: 0.17, Cas#: 7732-18-5, 7773-01-5 Research or further manufacturing use only, not for food or drug use. (1 per EA)Learn More$46.00 -
Electrode Storage Solution pH4, 4.00 L Poly naturalSKU: CE001600-4A-EAManufacturer: Reagents IncElectrode Storage Solution pH4, 4.00 L Poly natural (1 per EA )Learn Morewas $188.00 Special Price $137.55 -
Sodium Hydroxide 10% W/W, 1L, Poly BottleSKU: LC240752-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $43.50 Special Price $33.46 - Glycerin:Water, 3:1, 1.00 L Poly naturalSKU: CG000100-1A-EAManufacturer: Reagents IncGlycerin:Water, 3:1, 1.00 L Poly natural (1 per EA )Learn Morewas $138.00 Special Price $103.68
- Sulfuric Acid, 2.5N (1.25M), 1L, Poly BottleSKU: LC258002-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2796 (1 per EA)Learn Morewas $55.40 Special Price $42.63
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Buffer Solution Concentrate, pH 4.00 +/- 0.02 @ 25 DEG C, 500mLSKU: B1166-500MLPL-CSManufacturer: Spectrum ChemicalBuffer Solution Concentrate, pH 4.00 +/- 0.02 @ 25 DEG C - Spectrum's Buffer Solution Concentrates when diluted as directed will yield a pH 4.00 SOLUTION. Spectrum Buffer Solution Concentrates are relied upon for cost effective, fast, accurate results in life sciences and pharmaceutical quality control applications. (6 per CS )Learn Morewas $1,175.05 Special Price $956.15 - Ammonium Hydroxide, 16.7% v/v, 55.00 gal DrumSKU: CA015200-55E-EAManufacturer: Reagents IncAmmonium Hydroxide, 16.7% v/v, 55.00 gal Drum (1 per EA )Learn Morewas $1,860.00 Special Price $1,395.36
- Sodium Hydroxide, 0.0227N (0.0227M), 1L, Poly BottleSKU: LC242302-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $43.50 Special Price $33.46
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Sodium Hydroxide-Sodium Thiosulfate, 10L, Cubitainer®SKU: LC246006-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $181.60 Special Price $139.70 -
Sulfosalicylic Acid 20% W/V, 500ML, Amber PolySKU: LC255451-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $116.30 Special Price $89.47 - Sulfuric Acid, 59.5% w/w, 200.00 L EachSKU: CS103200-200Y-EAManufacturer: Reagents IncSulfuric Acid, 59.5% w/w, 200.00 L Each (1 per EA )Learn Morewas $2,250.00 Special Price $1,688.04
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Calcium Chloride TS - 100mLSKU: TS14067-100ml-EAManufacturer: Dawn ScientificCalcium Chloride TS - 100mL (1 per EA )Learn Morewas $39.62 Special Price $38.63 -
Nitric Acid, 20 Percent (w/v) Aqueous Solution, 1L, CAS# 7697-37-2SKU: N-170-1LT-EAManufacturer: Spectrum ChemicalNitric Acid, 20 Percent (w/v) Aqueous 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 $154.45 Special Price $125.68 - Copper tetrammine ammonical solution - 100mLSKU: TS14415-100ml-EAManufacturer: Dawn ScientificCopper tetrammine ammonical solution - 100mL (1 per EA )Learn Morewas $149.62 Special Price $145.88
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Sodium Hydroxide, 5 N Aqueous Solution, 1L, CAS# 1310-73-2SKU: S-390-1LT-EAManufacturer: Spectrum ChemicalSodium Hydroxide, 5 N Aqueous Solution is a standard solution of Caustic soda ideally suited for laboratory titrimetric techniques. You can rely on the quality of LabChem analytical test solutions for lot-to-lot reproducibility. (1 per EA )Learn Morewas $92.75 Special Price $75.47 - Sodium Chloride-Hydroxylamine Sulfate, 500ML, Poly BottleSKU: LC236001-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $123.70 Special Price $95.17
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Reagent Test Chloride 100 Tests, Ea/1SKU: 2419031-EAManufacturer: Lovibond Tintometer GroupLovibond® Chloride Reagent Set, 50-75 Tests (1 per EA)Learn More$100.10 -
Trichloroacetic Acid, 20 Percent (w/v) Aqueous Solution, 500mL, CAS# 76-03-9SKU: T-185-500MLGL-EAManufacturer: Spectrum ChemicalTrichloroacetic Acid, 20 Percent (w/v) Aqueous Solution and other TCA solutions are used, depending upon grade and purity, in biochemistry to help the precipitation of macromolecules, cosmetics, topical medication preparations and in the production of pesticides. 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 $202.10 Special Price $164.44 -
Sodium Hydroxide, 0.01N (0.01M), 4L, Poly BottleSKU: LC242004-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $82.20 Special Price $63.24 - Water Hardness Buffer (With Magnesium), 4L, Poly BottleSKU: LC268104-EAManufacturer: LabChemShelf Life (months): 6, , UN Number: UN2672 (1 per EA)Learn Morewas $202.40 Special Price $155.71
- Sulfuric Acid, 2 N, 500.00 mL Poly naturalSKU: CS106300-500A-EAManufacturer: Reagents IncSulfuric Acid, 2 N, 500.00 mL Poly natural (1 per EA )Learn Morewas $28.50 Special Price $21.60
- Sulfuric Acid 10% V/V (1+9), 1L, Poly BottleSKU: LC255802-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2796 (1 per EA)Learn Morewas $51.50 Special Price $39.62
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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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