Solutions are used in practically every lab, for a broad range of processes.  Lab Procurement Services carries an extensive collection of products to handle our customers' diverse requirements, including various titrimetric and other wet methods.  Please be sure to visit our pH Buffers category for all of your electrochemistry calibration needs, and our Beakers and Flasks collections to view our offerings of those essential items.

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.

Buffers and Solutions

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  1. Methoxyphenylacetic TS - 100mL
    Manufacturer: Dawn Scientific
    Methoxyphenylacetic TS - 100mL (1 per EA )
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    was $69.62 Special Price $67.88
  2. Methyl Red TS 2 - 500mL
    Manufacturer: Dawn Scientific
    Methyl Red TS 2 - 500mL (1 per EA )
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    was $134.62 Special Price $131.25
  3. Methyl Yellow-Methylene Blue TS - 100mL
    Manufacturer: Dawn Scientific
    Methyl Yellow-Methylene Blue TS - 100mL (1 per EA )
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    was $59.62 Special Price $58.13
  4. Erichrome Cyanine TS - 100mL
    Manufacturer: Dawn Scientific
    Erichrome Cyanine TS - 100mL (1 per EA )
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    was $45.62 Special Price $44.47
  5. Formaldehyde TS - 500mL
    Manufacturer: Dawn Scientific
    Formaldehyde TS - 500mL (1 per EA )
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    was $99.62 Special Price $97.12
  6. Methyl Violet TS - 500mL
    Manufacturer: Dawn Scientific
    Methyl Violet TS - 500mL (1 per EA )
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    was $139.62 Special Price $136.13
  7. Bromocresol Gren-Methyl Red TS - 100mL
    Manufacturer: Dawn Scientific
    Bromocresol Gren-Methyl Red TS - 100mL (1 per EA )
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    was $34.62 Special Price $33.75
  8. Sodium Hydroxide TS 2 - 500mL
    Manufacturer: Dawn Scientific
    Sodium Hydroxide TS 2 - 500mL (1 per EA )
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    was $89.62 Special Price $87.38
  9. Bromocresol Gren-Methyl Red TS - 500mL
    Manufacturer: Dawn Scientific
    Bromocresol Gren-Methyl Red TS - 500mL (1 per EA )
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    was $99.62 Special Price $97.12
  10. Sodium Alizarinsulfonate TS - 500mL
    Manufacturer: Dawn Scientific
    Sodium Alizarinsulfonate TS - 500mL (1 per EA )
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    was $114.62 Special Price $111.76
  11. Methyl Red TS 2 - 100mL
    Manufacturer: Dawn Scientific
    Methyl Red TS 2 - 100mL (1 per EA )
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    was $54.62 Special Price $53.25
  12. PetEther/Dichloromethane 80/20, 2.50 L Glass amber
    Manufacturer: Reagents Inc
    PetEther/Dichloromethane 80/20, 2.50 L Glass amber (1 per EA )
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    was $498.00 Special Price $373.68
  13. Phenol/Methanol 80:20 W/W, 2.50 L Each
    Manufacturer: Reagents Inc
    Phenol/Methanol 80:20 W/W, 2.50 L Each (1 per EA )
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    was $470.00 Special Price $352.08
  14. Sodium Periodate 6% w/v, 4.00 L Black poly
    Manufacturer: Reagents Inc
    Sodium Periodate 6% w/v, 4.00 L Black poly (1 per EA )
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    was $2,140.00 Special Price $1,604.88
  15. Sodium Nitrite 0.1 M (0.2 N), 10.00 L Cubitainer
    Manufacturer: Reagents Inc
    Sodium Nitrite 0.1 M (0.2 N), 10.00 L Cubitainer (1 per EA )
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    was $449.00 Special Price $336.96
  16. Hydrochloric Acid, SVS Concentrate, To Prepare 0.01 N Solution, 1UNIT, CAS# 7647-01-0
    Manufacturer: Spectrum Chemical
    Hydrochloric Acid, SVS Concentrate, To Prepare 0.01 N Solution is a colorless, clear, highly corrosive, highly pungent concentrate of hydrogen chloride in water. Spectrum's Standard Volumetric Solution (SVS) concentrate when diluted to 1 liter will yield a 0.01 N solution. As an monoprotic acid and one of the six common strong mineral acids it is the least likely to be subject to an oxidation-reduction reaction. Hydrochloric acid is frequently used during chemical analysis to prepare samples for analysis. It reacts with basic compounds, turning them into dissolved chlorides that can then undergo analysis.

    (1 per EA )
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    $98.05
  17. Potassium Hydroxide, SVS Concentrate, To Prepare 1.0 N Solution, 1UNIT, CAS# 1310-58-3
    Manufacturer: Spectrum Chemical
    Potassium Hydroxide, SVS Concentrate, To Prepare 1.0 N Solution (1 per EA )
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    $109.45
  18. Sulfuric Acid, 12.00 N Solution, 2.5L, CAS# 7775-14-6
    Manufacturer: Spectrum Chemical
    Sulfuric Acid, 12.00 N Solution - Spectrum solutions utilize the highest quality raw materials appropriate to your product. Most raw materials meet or exceed the specifications established by the American Chemical Society. Where appropriate, many finished products are traceable to NIST Standard Reference Materials. Manufacturing, quality control testing, and packaging are all performed in Spectrum’s own facilities. Record keeping and sample retention of all produced lots ensure product consistency and complete traceability.

    (1 per EA )
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    was $105.40 Special Price $86.81
  19. Boron Trifluoride 50 Percent in Methanol, 250mL, CAS# 373-57-9
    Manufacturer: Spectrum Chemical
    Boron Trifluoride 50 Percent in Methanol, also known as Trifluoroborane, is an inorganic compound used as a reagent in organic chemistry and considered a versatile building block. Spectrum solutions utilize the highest quality raw materials appropriate to your product. Most raw materials meet or exceed the specifications established by the American Chemical Society. Where appropriate, many finished products are traceable to NIST Standard Reference Materials. Manufacturing, quality control testing, and packaging are all performed in Spectrum’s own facilities. Record keeping and sample retention of all produced lots ensure product consistency and complete traceability.

    (1 per EA )
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    $1,003.80
  20. Methyl Orange, 0.2 Percent Aqueous Solution, 500mL, CAS# 547-58-0
    Manufacturer: Spectrum Chemical
    Methyl Orange, 0.2 Percent Aqueous Solution is most typically used in titrations due to the fact of its color change. The color changes happen in acidic conditions and usually moves from red to orange and eventually to yellow. Spectrum solutions utilize the highest quality raw materials appropriate to your product. Most raw materials meet or exceed the specifications established by the American Chemical Society. Where appropriate, many finished products are traceable to NIST Standard Reference Materials. Manufacturing, quality control testing, and packaging are all performed in Spectrum’s own facilities. Record keeping and sample retention of all produced lots ensure product consistency and complete traceability.

    (1 per EA )
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    was $273.25 Special Price $225.08
  21. Potassium Fluoride, 50 Percent (w/v) Solution, 20L, CAS# 7789-23-3
    Manufacturer: Spectrum Chemical
    Potassium Fluoride, 50 Percent (w/v) 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 )
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    was $2,005.80 Special Price $1,187.00
  22. Dibasic Sodium Phosphate TS, (U.S.P. Test Solution), 1L, CAS# 7558-79-4
    Manufacturer: Spectrum Chemical
    Dibasic Sodium Phosphate TS, (U.S.P. Test Solution) is a ready-for-use solution for the purpose of conducting USP, National Formulary and assay tests and is prepared according to the specifications of the USP Pharmacopeial Convention.

    (1 per EA )
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    was $644.30 Special Price $619.57
  23. Sodium Chloride, SVS Concentrate, To Prepare 0.1 N Solution, 1UNIT, CAS# 7647-14-5
    Manufacturer: Spectrum Chemical
    Sodium Chloride, SVS Concentrate, To Prepare 0.1 N Solution (6 per CS )
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    $480.75
  24. Carboxymethylcellulose Sodium, Medium Viscosity, Viscosity of 2 Percent Aqueous Solution @ 25 DEG C: 400-800 cP, USP4-32-4
    Manufacturer: Spectrum Chemical
    Carboxymethylcellulose Sodium, Medium Viscosity, Viscosity of 2 Percent Aqueous Solution @ 25 DEG C: 400-800 cP, USP is often used as a thickener and stabilizer. All Spectrum Chemical USP grade products are manufactured, packaged and stored under current Good Manufacturing Practices (cGMP). (1 per EA)
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    was $3,726.15 Special Price $3,307.60
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