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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Iodide Solution 2oz DBSKU: R-0772-C-EAManufacturer: Taylor TechnologiesIodide Solution 2oz DB (1 per EA)Learn Morewas $21.36 Special Price $16.32 -
Silica Reagent #1, 2 ozSKU: R-1306T-C-EAManufacturer: Taylor TechnologiesSilica Reagent #1, 2 oz (1 per EA)Learn Morewas $10.39 Special Price $7.93 -
Molybdate Reagent, 2 oz, Dropper BottleSKU: R-0601-C-DB-EAManufacturer: Taylor TechnologiesMolybdate Reagent, 2 oz, Dropper Bottle (1 per EA)Learn Morewas $12.95 Special Price $9.89 -
Thiosulfate N/10, 16 ozSKU: R-0697-E-EAManufacturer: Taylor TechnologiesThiosulfate N/10, 16 oz (1 per EA)Learn Morewas $15.44 Special Price $11.79 -
Thiosulfate Reagent (2 mL sample, 1 dr=0.5% H₂O₂; 1 mL sample, 1 dr=1% H₂O₂), 2 oz, Dropper BottleSKU: R-0885-C-EAManufacturer: Taylor TechnologiesThiosulfate Reagent (2 mL sample, 1 dr=0.5% H₂O₂; 1 mL sample, 1 dr=1% H₂O₂), 2 oz, Dropper Bottle (1 per EA)Learn Morewas $32.63 Special Price $24.93 -
Thiosulfate Reagent (chlorine titrant), 16 ozSKU: R-0700-E-EAManufacturer: Taylor TechnologiesThiosulfate Reagent (chlorine titrant), 16 oz (1 per EA)Learn Morewas $59.66 Special Price $45.57 -
Bleach Reagent #3, 16 ozSKU: R-0666-E-EAManufacturer: Taylor TechnologiesBleach Reagent #3, 16 oz (1 per EA)Learn Morewas $53.07 Special Price $40.54 -
Permanganate Reagent (25 mL sample, 1 drop = 100 ppm NaNO₂), 2 ozSKU: R-0730-C-EAManufacturer: Taylor TechnologiesPermanganate Reagent (25 mL sample, 1 drop = 100 ppm NaNO₂), 2 oz (1 per EA)Learn Morewas $11.50 Special Price $8.79 -
Methyl Red Indicator, 2 ozSKU: R-1003F-C-EAManufacturer: Taylor TechnologiesMethyl Red Indicator, 2 oz (1 per EA)Learn Morewas $18.31 Special Price $13.99 -
Phenolphthalein Indicator 1%, 16 ozSKU: R-0638S-E-EAManufacturer: Taylor TechnologiesPhenolphthalein Indicator 1%, 16 oz (1 per EA )Learn Morewas $33.25 Special Price $29.74 -
Hardness Reagent A (odorless buffer), 16 ozSKU: R-0614-E-EAManufacturer: Taylor TechnologiesHardness Reagent A (odorless buffer), 16 oz (1 per EA)Learn Morewas $245.19 Special Price $187.29 -
QAC Titrating Solution (lo range), 16 ozSKU: R-0951-E-EAManufacturer: Taylor TechnologiesQAC Titrating Solution (lo range), 16 oz (1 per EA)Learn Morewas $62.87 Special Price $48.03 -
Iodide Iodate Reagent (25 mL sample, 1 drop = 2 ppm Na₂SO₃), galSKU: R-0808-G-EAManufacturer: Taylor TechnologiesIodide Iodate Reagent (25 mL sample, 1 drop = 2 ppm Na₂SO₃), gal (1 per EA )Learn Morewas $74.65 Special Price $66.78 -
Silica Reagent #3, 2 ozSKU: R-1305U-C-EAManufacturer: Taylor TechnologiesSilica Reagent #3, 2 oz (1 per EA)Learn Morewas $15.68 Special Price $11.97 -
Hardness Reagent (1 drop = 10 ppm hardness as CaCO₃), 32 ozSKU: R-0683-F-EAManufacturer: Taylor TechnologiesHardness Reagent (1 drop = 10 ppm hardness as CaCO₃), 32 oz (1 per EA)Learn Morewas $51.50 Special Price $39.35 -
Hardness Buffer, 2 oz w/ light blue cap, Dropper BottleSKU: R-0619LB-C-EAManufacturer: Taylor TechnologiesHardness Buffer, 2 oz w/ light blue cap, Dropper Bottle (1 per EA)Learn Morewas $13.35 Special Price $10.19 -
Hardness Reagent B, 10 g w/ blue dotSKU: R-0615-I-EAManufacturer: Taylor TechnologiesHardness Reagent B, 10 g w/ blue dot (1 per EA)Learn Morewas $12.22 Special Price $9.33 - Slide, Chlorine DPD, 1.0-10 ppmSKU: 5514-EAManufacturer: Taylor TechnologiesSlide, Chlorine DPD, 1.0-10 ppm (1 per EA )Learn Morewas $1.04 Special Price $0.93
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Phenolphthalein Indicator, 2 oz w/ brown cap, Dropper BottleSKU: R-0638BR-C-EAManufacturer: Taylor TechnologiesPhenolphthalein Indicator, 2 oz w/ brown cap, Dropper Bottle (1 per EA)Learn Morewas $12.93 Special Price $9.88 -
Complexing Reagent, 2 ozSKU: R-0950-C-EAManufacturer: Taylor TechnologiesComplexing Reagent, 2 oz (1 per EA)Learn Morewas $25.75 Special Price $19.67 -
Chlorine Reagent #2, 2 ozSKU: R-0604-C-EAManufacturer: Taylor TechnologiesChlorine Reagent #2, 2 oz (1 per EA)Learn Morewas $18.33 Special Price $14.00 -
PAA Reagent #4, 2 oz, Dropper BottleSKU: R-0928-C-EAManufacturer: Taylor TechnologiesPAA Reagent #4, 2 oz, Dropper Bottle (1 per EA)Learn Morewas $19.36 Special Price $14.79 -
Iodide Iodate N/126, galSKU: R-0633-126-G-EAManufacturer: Taylor TechnologiesIodide Iodate N/126, gal (1 per EA)Learn Morewas $78.88 Special Price $60.25 -
Iodide Iodate Reagent (1 drop = 10 ppm Na₂SO₃), galSKU: R-0699-G-EAManufacturer: Taylor TechnologiesIodide Iodate Reagent (1 drop = 10 ppm Na₂SO₃), gal (1 per EA)Learn Morewas $106.57 Special Price $81.40
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