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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Ethylene Glycol, 50% v/v, 20.00 L CubitainerSKU: CE247600-20F-EAManufacturer: Reagents IncEthylene Glycol, 50% v/v, 20.00 L Cubitainer (1 per EA )Learn Morewas $492.00 Special Price $369.36 -
Potassium Dichromate TS - 500mLSKU: TS14216-500ml-EAManufacturer: Dawn ScientificPotassium Dichromate TS - 500mL (1 per EA )Learn Morewas $95.62 Special Price $93.23 - Barium Hydroxide TS - 500mLSKU: TS14050-500ml-EAManufacturer: Dawn ScientificBarium Hydroxide TS - 500mL (1 per EA )Learn Morewas $64.62 Special Price $63.01
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Hydrochloric Acid, 3 N Solution, 500mL, CAS# 7647-01-0SKU: H-150-500ML-EAManufacturer: Spectrum ChemicalHydrochloric Acid, 3 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 Morewas $69.25 Special Price $56.35 -
Phenolphthalein, 1 Percent (w/v) Indicator Solution in 95 Percent Ethanol, 1L, CAS# 77-09-8SKU: P-902-1LT-EAManufacturer: Spectrum ChemicalPhenolphthalein, 1 Percent (w/v) Indicator Solution in 95 Percent Ethanol (1 per EA )Learn Morewas $69.25 Special Price $61.47 -
Acetic Acid, 20% v/v Solution, 3.8 L, Poly GallonSKU: A1008-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsAcetic Acid, 20% v/v Solution, 3.8 L, Poly Gallon (1 per EA )Learn More$57.15 - Stannous Chloride, 2% /10% HCl, 10.00 L CubitainerSKU: CS205000-10F-EAManufacturer: Reagents IncStannous Chloride, 2% /10% HCl, 10.00 L Cubitainer (1 per EA )Learn Morewas $178.00 Special Price $133.92
- pH Neutralized IPA, 20.00 L CubitainerSKU: CI001400-20F-EAManufacturer: Reagents IncpH Neutralized IPA, 20.00 L Cubitainer (1 per EA )Learn Morewas $348.00 Special Price $261.36
- Perchloric Acid TS - 100mLSKU: TS14196-100ml-EAManufacturer: Dawn ScientificPerchloric Acid TS - 100mL (1 per EA )Learn Morewas $39.62 Special Price $38.63
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Hydrochloric Acid, 50 Percent (v/v), Aqueous Solution, APHA, 1L, CAS# 7365-45-9SKU: H-195-1LT-EAManufacturer: Spectrum ChemicalHydrochloric Acid, 50 Percent (v/v), Aqueous Solution, APHA 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 Morewas $118.40 Special Price $96.35 -
Ammonium Carbonate TS, (U.S.P. Test Solution), 500mL, CAS# 506-87-6SKU: A-302-500ML-EAManufacturer: Spectrum ChemicalAmmonium Carbonate TS, (U.S.P. Test Solution) is a ready-for-use solution for the purpose of conducting USP, National Formulary and assay tests and is prepared according to the specifications of the USP Pharmacopeial Convention. (1 per EA )Learn Morewas $694.95 Special Price $668.29 - Sodium Silicate, 36.9% to 38.1%, TechnicalSKU: S1136-55gal-EAManufacturer: 710 Spirits Rocky Mtn Reagents41 Baume; Type N **DRUM CLEANOUT FEE** **DRUM DEPOSIT** (1 per EA)Learn More$529.25
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Potassium Biiodate, 0.025N (0.0021M), 4L, Poly BottleSKU: LC187304-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $213.00 Special Price $159.75 -
Buffer Solution pH 8.0, 500ML, Poly BottleSKU: LC124201-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $35.90 Special Price $26.92 - Kroll's Reagent, 1.00 L Poly naturalSKU: CK010500-1A-EAManufacturer: Reagents IncKroll's Reagent, 1.00 L Poly natural (1 per EA )Learn Morewas $386.00 Special Price $289.44
- Triton X-100™ Wetting Agent, 1.00 L Poly naturalSKU: C2342800-1A-EAManufacturer: Reagents IncTriton X-100™ Wetting Agent, 1.00 L Poly natural (1 per EA )Learn Morewas $238.00 Special Price $178.20
- MEK/Toluene, 60:40 w/w, 4.00 L Glass amberSKU: CT144200-4C-EAManufacturer: Reagents IncMEK/Toluene, 60:40 w/w, 4.00 L Glass amber (1 per EA )Learn Morewas $155.00 Special Price $119.24
- TMAH, 25% w/w / MeOH HPLC, 1.00 L Glass amberSKU: CT008100-1C-EAManufacturer: Reagents IncTMAH, 25% w/w / MeOH HPLC, 1.00 L Glass amber (1 per EA )Learn Morewas $1,550.00 Special Price $1,192.43
- Barium Chloride, 0.025 M/0.05N, 1.00 L Poly naturalSKU: CB100700-1A-EAManufacturer: Reagents IncBarium Chloride, 0.025 M/0.05N, 1.00 L Poly natural (1 per EA )Learn Morewas $85.00 Special Price $63.72
- Aluminum Sulfate, 20% w/w, 4.00 L Poly naturalSKU: CA207500-4A-EAManufacturer: Reagents IncAluminum Sulfate, 20% w/w, 4.00 L Poly natural (1 per EA )Learn Morewas $591.00 Special Price $442.80
- Acetic Acid, 30% v/v, 1.00 L Poly naturalSKU: CA299500-1A-EAManufacturer: Reagents IncAcetic Acid, 30% v/v, 1.00 L Poly natural (1 per EA )Learn Morewas $52.00 Special Price $38.88
- Sodium Bisulfite, 1.25% w/v, 500.00 mL Glass amberSKU: CS005500-500C-EAManufacturer: Reagents IncSodium Bisulfite, 1.25% w/v, 500.00 mL Glass amber (1 per EA )Learn Morewas $47.00 Special Price $35.64
- Potassium Hydroxide TS, Alcoholic - 100mLSKU: TS14220-100ml-EAManufacturer: Dawn ScientificPotassium Hydroxide TS, Alcoholic - 100mL (1 per EA )Learn Morewas $39.62 Special Price $38.63
- Acetic Acid, 1.0N (1.0M), 500ML, Poly BottleSKU: LC103801-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $37.20 Special Price $27.90
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BEAD BATH 20 L, 120 V, TYPE B PLUG, Liters/EA: 20
was $1,794.65 Special Price $1,714.78
LPS 200uL Universal Pipet Tips, Yellow, Bulk, PK1000
was $20.00 Special Price $15.75
4L Yellow Buffer Solution pH 7.0 @ 25°C, Poly Bottle
was $74.64 Special Price $21.46
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