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 Thiosulfate, 0.025 Normal, 1 L, Amber PolySKU: S1087-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsN/40 (0.025 M) (1 per EA)Learn More$23.30 - Sodium Thiosulfate, 0.01 Normal, 1 L, Amber PolySKU: S1112-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsN/100 (0.01 M) (1 per EA)Learn More$23.20
- pH 4.00 Calibration Buffer, Red, 500 mLSKU: P1001-500mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsNIST Traceable; pH = 4.00 ? 0.01 @ 25 ?C (1 per EA)Learn More$13.10
- Bromothymol Blue, 0.04% w/v in Denatured Ethanol, 3.8 LSKU: B1014-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentspH 6.0 (yellow) - pH 7.6 (blue) (1 per EA)Learn More$84.45
- Potassium Chromate, 0.1 Normal, 3.8 L, Poly GallonSKU: CF1175-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsPotassium Chromate, 0.1 Normal, 3.8 L, Poly Gallon (1 per EA )Learn More$60.30
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Formaldehyde, ACS, CAS# 50-00-0SKU: F1022-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsAssay: 37% Minimum; Stabalized with Methanol (1 per EA)Learn More$81.15 - Hydrochloric Acid, 1 Normal, 20 L, CubitainerSKU: H1010-20L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsN/1 (1 M) (1 per EA)Learn More$116.15
- Nitric Acid, 6 Normal, 2.2 L, PPQ (Poly)SKU: N1012-2.2L-EAManufacturer: 710 Spirits Rocky Mtn Reagents(6 M) (1 per EA)Learn More$100.80
- Nitric Acid, 40% w/w Solution, 2.2 L, PPQ (Poly)SKU: N1037-2.2L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsNitric Acid, 40% w/w Solution, 2.2 L, PPQ (Poly) (1 per EA )Learn More$96.70
- Phenolphthalein, 1% w/v in Denatured Ethanol, 3.8 LSKU: P1012-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentspH 8.0 (colorless) - pH 10.0 (pink) (1 per EA)Learn More$83.40
- Potassium Fluoride, 50% w/w Solution, 500 mL, PolySKU: P1030-500mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsPotassium Monofluoride, Dihydrate (1 per EA)Learn More$101.50
- Potassium Chromate, 5% w/v Solution, 3.8 L, Poly GallonSKU: P1035-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsPotassium Chromate, 5% w/v Solution, 3.8 L, Poly Gallon (1 per EA)Learn More$86.25
- Potassium Iodide, 15% w/v Solution, 1 L, Amber PolySKU: P1065-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsPotide (1 per EA)Learn More$61.30
- Potassium Iodide, 10% w/v Solution with 2% EDTA, 3.8 L, Amber PolySKU: P1079-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsN/5 (0.04 M); Permanganic Acid, Potassium Salt (1 per EA)Learn More$100.15
- Triethanolamine, 50% v/v Solution, 500 mL, Amber PolySKU: T1029-500mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsTriethanolamine, 50% v/v Solution, 500 mL, Amber Poly (1 per EA )Learn More$62.05
- Ceric Sulfate, 0.1 Normal, 20 L, CubitainerSKU: C1019-20L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsN/10 (0.1 M); in 2 N Sulfuric Acid (1 per EA)Learn More$608.20
- TISAB II, 20 LSKU: T1027-20L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsTISAB II, 20 L (1 per EA)Learn More$357.30
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Buffer Solution pH 9.18, 10L, Cubitainer®SKU: LC124506-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $323.10 Special Price $242.33 -
Bromocresol Green-Methyl Red, 500ML, Amber PolySKU: LC118701-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $59.60 Special Price $44.70 -
Ammonium Molybdate 10% W/V, 1L, Poly BottleSKU: LC112502-EAManufacturer: LabChemShelf Life (months): 12, , UN Number: (1 per EA)Learn Morewas $141.10 Special Price $105.83 -
Mercuric Thiocyanate 0.42% W/V In Methanol, 500ML, Amber GlassSKU: LC167201-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: UN1993 (1 per EA)Learn Morewas $74.80 Special Price $56.10 - Buffer Solution pH 5.0, 10L, Cubitainer®SKU: LC123006-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $232.80 Special Price $174.60
- Buffer Solution pH 1.07, 1L, Poly BottleSKU: LC122002-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $70.30 Special Price $52.73
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Potassium Hydroxide, 0.5N (0.5M) In Methanol, 20L, Cubitainer®SKU: LC195205-EAManufacturer: LabChemShelf Life (months): 18, Traceable to NIST, UN Number: UN2924 (1 per EA)Learn Morewas $621.60 Special Price $466.20
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