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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Kalling's Reagent II, 250.00 mL Poly naturalSKU: CK158000-250A-EAManufacturer: Reagents IncKalling's Reagent II, 250.00 mL Poly natural (1 per EA )Learn Morewas $142.00 Special Price $106.92 - Pot Bromate-Bromide, 0.05 N, 1.00 L Glass amberSKU: CP112500-1C-EAManufacturer: Reagents IncPot Bromate-Bromide, 0.05 N, 1.00 L Glass amber (1 per EA )Learn Morewas $109.00 Special Price $82.08
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Mercuric Nitrate Titrating Solution, 2 oz, Dropper BottleSKU: R-0845-C-EAManufacturer: Taylor TechnologiesMercuric Nitrate Titrating Solution, 2 oz, Dropper Bottle (1 per EA)Learn Morewas $30.74 Special Price $23.49 - Oxalic Acid, 0.1 N (0.05 M), 1.00 L Glass amberSKU: CO100000-1C-EAManufacturer: Reagents IncOxalic Acid, 0.1 N (0.05 M), 1.00 L Glass amber (1 per EA )Learn Morewas $125.00 Special Price $93.96
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250mL Red Buffer Solution pH 4.0 @ 25°C, Poly BottleSKU: MSI-B2283-250ML-EAManufacturer: Midland Scientific250mL Red Buffer Solution pH 4.0 @ 25°C, Poly Bottle (1 per EA )Learn Morewas $28.80 Special Price $6.56 -
Iodine Monochloride, Solution, 4L, CAS# 7790-99-0SKU: I-147-4LT-EAManufacturer: Spectrum ChemicalIodine Monochloride, Solution is used as an iodination reagent in organic synthesis. 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 $730.90 Special Price $594.72 -
Silver Nitrate, 0.1N, Standardized Solution, 20L, CAS# 7761-88-8SKU: S-163-20LT-EAManufacturer: Spectrum ChemicalSilver Nitrate, 0.1N, Standardized Solution is an inorganic aqueous solution. It is used to titrimetrically determine purity of products containing halides by the direct titration with standardized silver nitrate solution. (1 per EA )Learn Morewas $2,200.70 Special Price $1,790.69 -
Microcosmic Salt Solution, 500ML, Poly BottleSKU: LC169811-EAManufacturer: LabChemShelf Life (months): 12, , UN Number: (1 per EA)Learn Morewas $89.00 Special Price $66.75 - Phosphate Buffer, pH 7 (Amp), 1.00 L Poly naturalSKU: CP004000-1A-EAManufacturer: Reagents IncPhosphate Buffer, pH 7 (Amp), 1.00 L Poly natural (1 per EA )Learn Morewas $137.00 Special Price $105.40
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EDTA Disodium, 0.0575 M Solution, 4L, CAS# 6381-92-6SKU: E-115-4LTPL-EAManufacturer: Spectrum ChemicalEDTA Disodium, 0.0575 M 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 $204.35 Special Price $166.28 - Buffer, pH 10.00, Blue, 1.00 L Poly naturalSKU: C2156500-1A-EAManufacturer: Reagents IncBuffer, pH 10.00, Blue, 1.00 L Poly natural (1 per EA )Learn Morewas $43.00 Special Price $32.40
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Sodium Sulfate, 30% w/w Solution, 1 L, PolySKU: S1234-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsSodium Sulfate, 30% w/w Solution, 1 L, Poly (1 per EA )Learn More$95.00 - Phenolphthalein, 1% /95% Alc, 500.00 mL Poly naturalSKU: C7270220-500A-EAManufacturer: Reagents IncPhenolphthalein, 1% /95% Alc, 500.00 mL Poly natural (1 per EA )Learn Morewas $35.00 Special Price $25.92
- Sodium Bisulfite, 5% w/v, 20.00 L CubitainerSKU: CS005400-20F-EAManufacturer: Reagents IncSodium Bisulfite, 5% w/v, 20.00 L Cubitainer (1 per EA )Learn Morewas $223.00 Special Price $167.40
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Ammonia TS 2 - 500mLSKU: TS14026-500ml-EAManufacturer: Dawn ScientificAmmonia TS 2 - 500mL (1 per EA )Learn Morewas $144.62 Special Price $141.00 - Lactic Acid, 1.0N (1.0M), 500ML, Poly BottleSKU: LC160201-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $82.40 Special Price $61.80
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DipHenylcarbazide 0.5% In Acetone, 500ML, Amber GlassSKU: LC136701-EAManufacturer: LabChemShelf Life (months): 6, , UN Number: UN1090 (1 per EA)Learn Morewas $180.60 Special Price $135.45 -
Hydrogen Bromide, 33 Percent Solution in Acetic Acid, 100kg, CAS# 10035-10-6SKU: H1141-100KGBL-EAManufacturer: 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. (1 per EA )Learn More$27,329.30 - Iodine TS - 500mLSKU: TS14131-500ml-EAManufacturer: Dawn ScientificIodine TS - 500mL (1 per EA )Learn Morewas $154.62 Special Price $150.76
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Potassium Hydroxide, 0.1N (0.1M) In Ipa, 1L, Poly BottleSKU: LC195502-EAManufacturer: LabChemShelf Life (months): 18, Traceable to NIST, UN Number: UN1993 (1 per EA)Learn Morewas $76.80 Special Price $57.60 -
4L Blue Buffer Solution pH 10.0 @ 25°C, CubitainerSKU: MSI-B2281-4LC-EAManufacturer: Midland Scientific4L Blue Buffer Solution pH 10.0 @ 25°C, Cubitainer (1 per EA )Learn Morewas $232.00 Special Price $56.69 -
Copper Reagent #2, .75 ozSKU: R-0861-A-EAManufacturer: Taylor TechnologiesCopper Reagent #2, .75 oz (1 per EA)Learn Morewas $9.83 Special Price $7.51 - Ferric Ion Solution 15, 1.00 L Poly naturalSKU: CF126300-1A-EAManufacturer: Reagents IncFerric Ion Solution 15, 1.00 L Poly natural (1 per EA )Learn Morewas $116.00 Special Price $87.48
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pHenylarsine Oxide, 0.00564N (0.00282M), 4L, Amber GlassSKU: LC183604-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $417.60 Special Price $313.20
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