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, 0.2N (0.2M), 1L, Poly BottleSKU: LC250652-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $40.30 Special Price $30.23 - Sodium Hypochlorite 5% W/V, 1L, Poly BottleSKU: LC246302-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $37.90 Special Price $28.43
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Nitric Acid, 1.0N (1.0M), 500ML, Amber GlassSKU: LC178401-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2031 (1 per EA)Learn Morewas $37.20 Special Price $27.90 -
Hydrochloric Acid 50% V/V (1+1), 1L, Amber GlassSKU: LC151302-EAManufacturer: LabChemShelf Life (months): 36, Traceable to NIST, UN Number: UN1789 (1 per EA)Learn Morewas $69.30 Special Price $51.98 -
Thioacetamide 0.25%, 500ML, Poly BottleSKU: LC260101-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $68.00 Special Price $52.32 - Hydrochloric Acid 10% V/V (1+9), 500ML, Poly BottleSKU: LC150701-EAManufacturer: LabChemShelf Life (months): 36, Traceable to NIST, UN Number: UN1789 (1 per EA)Learn Morewas $37.00 Special Price $27.75
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Ammonium Hydroxide 5% V/V (1+19), 20L, Cubitainer®SKU: LC111905-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $367.00 Special Price $275.25 -
Stannous Chloride 40%, 125ML, Amber GlassSKU: LC252007-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: UN1789 (1 per EA)Learn Morewas $78.00 Special Price $60.00 -
Potassium Iodide 5% W/V, 500ML, Amber PolySKU: LC197401-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $42.00 Special Price $31.50 - Sodium Hydroxide, 2.5N (2.5M), 500ML, Poly BottleSKU: LC244001-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $42.80 Special Price $32.93
- Starch 0.5% W/V W/Chloroform, 500ML, Poly BottleSKU: LC253051-EAManufacturer: LabChemShelf Life (months): 12, , UN Number: (1 per EA)Learn Morewas $44.40 Special Price $34.16
- Potassium Permanganate 0.891G/L, 500ML, Amber GlassSKU: LC198601-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $37.20 Special Price $27.90
- Ammonium Hydroxide 50% V/V (1+1), 500ML, Poly BottleSKU: LC111401-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2672 (1 per EA)Learn Morewas $60.70 Special Price $45.52
- Conditioning Reagent, 500ML, Poly BottleSKU: LC133201-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: UN1789 (1 per EA)Learn Morewas $78.90 Special Price $59.17
- Sulfuric Acid 37% V/V (37+63), 500ML, Poly BottleSKU: LC256201-EAManufacturer: LabChemShelf Life (months): 36, Traceable to NIST, UN Number: UN2796 (1 per EA)Learn Morewas $45.50 Special Price $35.00
- Sodium Thiosulfate, 0.2N (0.2M), 500ML, Poly BottleSKU: LC250651-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $28.80 Special Price $22.16
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Sulfuric Acid 10% W/W, 2.5L, Clear GlassSKU: LC255903-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2796 (1 per EA)Learn Morewas $100.20 Special Price $77.09 - Sulfuric Acid 50% V/V (1+1), 1L, Amber GlassSKU: LC256402-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1830 (1 per EA)Learn Morewas $62.30 Special Price $46.72
- Trichloroacetic Acid 80% W/V, 500ML, Amber GlassSKU: LC262651-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: UN2564 (1 per EA)Learn Morewas $207.90 Special Price $159.94
- Citric Acid 10% W/V, 500ML, Poly BottleSKU: LC131501-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $46.40 Special Price $34.80
- Triton X-100, 500ML, Poly BottleSKU: LC262801-EAManufacturer: LabChemShelf Life (months): , , UN Number: (1 per EA)Learn Morewas $89.60 Special Price $68.93
- Nitric Acid 10% V/V, 500ML, Amber GlassSKU: LC177301-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2031 (1 per EA)Learn Morewas $45.10 Special Price $33.83
- Sodium Carbonate, 1.0N (0.5M), 1L, Poly BottleSKU: LC233802-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $61.40 Special Price $46.05
- Ammonium Thiocyanate 30% W/V, 500ML, Poly BottleSKU: LC113451-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $133.10 Special Price $99.82
- Manufacturer LabChem Remove This Item
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