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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Mercuric Nitrate, 0.025N (0.013M), 500ML, Amber GlassSKU: LC166571-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $61.00 Special Price $45.75 -
Hydrochloric Acid, 0.25N (0.25M), 1L, Poly BottleSKU: LC152502-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1789 (1 per EA)Learn Morewas $39.80 Special Price $29.85 -
Sodium Silicate, 40 DEG Be Solution, 20L, CAS# 6834-92-0SKU: S1435-20LT-EAManufacturer: Spectrum ChemicalSodium Silicate, 40 DEG Be 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 $856.20 Special Price $506.68 -
Nitric Acid, 65% w/w, 2.50 L Glass clearSKU: CN200600-2.5D1-EAManufacturer: Reagents IncNitric Acid, 65% w/w, 2.50 L Glass clear (1 per EA )Learn Morewas $230.00 Special Price $172.80 -
Ammonia-Ammonium Chloride Buffer TS - 100mLSKU: TS14029-100ml-EAManufacturer: Dawn ScientificAmmonia-Ammonium Chloride Buffer TS - 100mL (1 per EA )Learn Morewas $45.62 Special Price $44.47 -
Silver Nitrate, 0.282N (0.282M), 1L, Amber GlassSKU: LC227252-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $585.80 Special Price $439.35 -
Methylene Blue, 1% w/v Solution, 120 mLSKU: M1019-120mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsMethylene Blue, 1% w/v Solution, 120 mL (1 per EA)Learn More$16.00 - Xylenol Orange, 0.1% w/v Solution, 1 LSKU: X1001-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsXylenol Orange, 0.1% w/v Solution, 1 L (1 per EA)Learn More$69.80
- Bromine solution - 500g, CAS#7726-95-6SKU: CH8011-500g-EAManufacturer: Dawn ScientificBromine solution - 500g, CAS#7726-95-6 (1 per EA )Learn Morewas $239.62 Special Price $233.63
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Potassium Hydroxide, 0.5N (0.5M), 20L, Cubitainer®SKU: LC193205-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1814 (1 per EA)Learn Morewas $347.70 Special Price $260.78 - Potassium Acid pHthalate, 0.05N (0.05M), 1L, Poly BottleSKU: LC187002-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $94.30 Special Price $70.73
- Lactic Acid 85% Purified, 100.00 mL Poly naturalSKU: C2108000-100A-EAManufacturer: Reagents IncLactic Acid 85% Purified, 100.00 mL Poly natural (1 per EA )Learn Morewas $43.50 Special Price $32.40
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Pd 250 Set 2 , Total Chlorine, , Ea/1SKU: 194910-EAManufacturer: Lovibond Tintometer GroupLovibond Reagent Dispenser PD250 Dispenser, Total Chlorine (1 per EA)Learn More$86.00 - Sodium Potassium Tartrate 10% W/V, 1L, Poly BottleSKU: LC248002-EAManufacturer: LabChemShelf Life (months): 6, , UN Number: (1 per EA)Learn Morewas $373.50 Special Price $287.34
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Glacial Acetic Acid TS - 500mLSKU: TS14120-500ml-EAManufacturer: Dawn ScientificGlacial Acetic Acid TS - 500mL (1 per EA )Learn Morewas $109.62 Special Price $106.88 - Potassium Chromate, 5% w/v, 500.00 mL Poly naturalSKU: CP101500-500A-EAManufacturer: Reagents IncPotassium Chromate, 5% w/v, 500.00 mL Poly natural (1 per EA )Learn Morewas $43.00 Special Price $32.40
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DipHenylcarbazone-BromopHenol Blue, 125ML, Amber GlassSKU: LC136807-EAManufacturer: LabChemShelf Life (months): 12, , UN Number: UN1993 (1 per EA)Learn Morewas $60.90 Special Price $45.67 - Boric Acid 4% W/V, 1L, Poly BottleSKU: LC117402-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $57.90 Special Price $43.43
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Silica Reagent #3, 2 oz, Dropper BottleSKU: R-1305U-C-DB-EAManufacturer: Taylor TechnologiesSilica Reagent #3, 2 oz, Dropper Bottle (1 per EA)Learn Morewas $16.93 Special Price $12.93 - Potassium Iodate, 0.1N (0.0167M), 1L, Poly BottleSKU: LC196302-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $73.00 Special Price $54.75
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Potassium Nitrate 10% W/V, 500ML, Poly BottleSKU: LC198201-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $128.30 Special Price $96.23 - Sodium Sulfite, 12.6% w/v Solution, 3.8 L, Amber GlassSKU: CF1170-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsSodium Sulfite, 12.6% w/v Solution, 3.8 L, Amber Glass (1 per EA )Learn More$50.20
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Starch Indicator, 0.2%, 125ML, Poly BottleSKU: LC252907-EAManufacturer: LabChemShelf Life (months): 12, , UN Number: (1 per EA)Learn Morewas $27.50 Special Price $21.16 - Sodium Thiosulfate, 1.0N (1.0M), 1L, Poly BottleSKU: LC251002-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $52.30 Special Price $40.23
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