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. Acetic Acid / Isooctane 60:40, 1.00 L Glass amber
    Manufacturer: Reagents Inc
    Acetic Acid / Isooctane 60:40, 1.00 L Glass amber (1 per EA )
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    was $138.00 Special Price $103.68
  2. Sulfuric Acid, 0.0018 N, 4.00 L Poly natural
    Manufacturer: Reagents Inc
    Sulfuric Acid, 0.0018 N, 4.00 L Poly natural (1 per EA )
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    was $89.00 Special Price $66.96
  3. Acetic Acid, 1 N (1 M), 1.00 L Poly natural
    Manufacturer: Reagents Inc
    Acetic Acid, 1 N (1 M), 1.00 L Poly natural (1 per EA )
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    was $54.00 Special Price $41.04
  4. Buffer, pH 4.00, Red, 500.00 mL Poly natural
    Manufacturer: Reagents Inc
    Buffer, pH 4.00, Red, 500.00 mL Poly natural (1 per EA )
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    was $27.00 Special Price $20.52
  5. Tartaric Acid, purified, 500.00 g wide mouth
    Manufacturer: Reagents Inc
    Tartaric Acid, purified, 500.00 g wide mouth (1 per EA )
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    was $345.00 Special Price $259.20
  6. Buffer, pH 7.40, 1.00 L Poly natural
    Manufacturer: Reagents Inc
    Buffer, pH 7.40, 1.00 L Poly natural (1 per EA )
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    was $49.00 Special Price $36.72
  7. Potassium Hydroxide, 0.5 N, 4.00 L Cubitainer
    Manufacturer: Reagents Inc
    Potassium Hydroxide, 0.5 N, 4.00 L Cubitainer (1 per EA )
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    was $149.00 Special Price $111.24
  8. Silver Nitrate, 0.1 N, 1.00 L Amber poly
    Manufacturer: Reagents Inc
    Silver Nitrate, 0.1 N, 1.00 L Amber poly (1 per EA )
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    was $202.00 Special Price $151.20
  9. Potassium Dichromate, 1 N, 15.00 gal Drum
    Manufacturer: Reagents Inc
    Potassium Dichromate, 1 N, 15.00 gal Drum (1 per EA )
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    was $1,330.00 Special Price $997.92
  10. Sodium Hydroxide, 0.05 N, 1.00 L Poly natural
    Manufacturer: Reagents Inc
    Sodium Hydroxide, 0.05 N, 1.00 L Poly natural (1 per EA )
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    was $41.00 Special Price $30.24
  11. Digestion Reagent, Cu catalyst, 4.00 L Poly natural
    Manufacturer: Reagents Inc
    Digestion Reagent, Cu catalyst, 4.00 L Poly natural (1 per EA )
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    was $264.00 Special Price $197.64
  12. Barium Chloride, 12% w/v, 10.00 L Cubitainer
    Manufacturer: Reagents Inc
    Barium Chloride, 12% w/v, 10.00 L Cubitainer (1 per EA )
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    was $254.00 Special Price $190.08
  13. Ammonium Hydroxide 26 Be, 2.50 L Glass clear
    Manufacturer: Reagents Inc
    Ammonium Hydroxide 26 Be, 2.50 L Glass clear (1 per EA )
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    was $92.00 Special Price $69.12
  14. Sodium Alizarinsulfonate TS - 100mL
    Manufacturer: Dawn Scientific
    Sodium Alizarinsulfonate TS - 100mL (1 per EA )
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    was $47.62 Special Price $46.43
  15. Sodium Hydroxide TS 2 - 100mL
    Manufacturer: Dawn Scientific
    Sodium Hydroxide TS 2 - 100mL (1 per EA )
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    was $34.62 Special Price $33.75
  16. Sodium Thiosulfate TS - 500mL
    Manufacturer: Dawn Scientific
    Sodium Thiosulfate TS - 500mL (1 per EA )
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    was $104.62 Special Price $102.01
  17. Acetate Buffer TS - 500mL
    Manufacturer: Dawn Scientific
    Acetate Buffer TS - 500mL (1 per EA )
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    was $65.62 Special Price $63.98
  18. Resorcinal TS - 100mL
    Manufacturer: Dawn Scientific
    Resorcinal TS - 100mL (1 per EA )
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    was $54.62 Special Price $53.25
  19. Potassium Hydroxide, 0.5 N Solution, 4L, CAS# 1310-58-3
    Manufacturer: Spectrum Chemical
    Potassium Hydroxide, 0.5 N Solution (1 per EA )
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    was $133.05 Special Price $108.27
  20. Sodium Thiosulfate, SVS Concentrate, To Prepare 0.01 N Solution, 1UNIT, CAS# 10102-17-7
    Manufacturer: Spectrum Chemical
    Sodium Thiosulfate, SVS Concentrate, To Prepare 0.01 N Solution - Spectrum's Standard Volumetric Solution (SVS) concentrate when diluted to 1 liter will yield a 0.01 N solution. Simply dilute the desired Standard Volumetric Solution concentrate to the specified volume (carefully following instructions provided with the package) and the resulting solution will have an exact Normality within 0.1%. Spectrum Standard Volumetric Solution concentrates are relied upon for fast, accurate results in life sciences and pharmaceutical quality control applications.

    (1 per EA )
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    $95.70
  21. Sodium DL-Lactate Solution, 60 Percent (w/w), USP, 4L, CAS# 72-17-3
    Manufacturer: Spectrum Chemical
    Sodium DL-Lactate Solution, 60 Percent (w/w), USP is used for the restoration of extracellular fluid and electrolytes balances. All Spectrum Chemical USP products are manufactured, packaged and stored under current Good Manufacturing Practices (cGMP) per 21CFR part 211 in FDA registered and inspected facilities.

    (1 per EA)
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    was $3,687.20 Special Price $2,208.78
  22. Potassium Bromate, SVS Concentrate, To Prepare 0.1 N Solution, 1UNIT, CAS# 7758-01-2
    Manufacturer: Spectrum Chemical
    Potassium Bromate, SVS Concentrate, To Prepare 0.1 N Solution - Spectrum's Standard Volumetric Solution (SVS) concentrate when diluted to 1 liter will yield a 0.1 N solution. Simply dilute the desired Standard Volumetric Solution concentrate to the specified volume (carefully following instructions provided with the package) and the resulting solution will have an exact Normality within 0.1%. Spectrum Standard Volumetric Solution concentrates are relied upon for fast, accurate results in life sciences and pharmaceutical quality control applications.

    (6 per CS )
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    $537.60
  23. Sodium Hydroxide, SVS Concentrate, To Prepare 1.0 N Solution, 1UNIT, CAS# 1310-73-2
    Manufacturer: Spectrum Chemical
    Sodium Hydroxide, SVS Concentrate, To Prepare 1.0 N Solution - Spectrum's Standard Volumetric Solution (SVS) concentrate when diluted to 1 liter will yield a 1.0 N solution. Simply dilute the desired Standard Volumetric Solution concentrate to the specified volume (carefully following instructions provided with the package) and the resulting solution will have an exact Normality within 0.1%. Spectrum Standard Volumetric Solution concentrates are relied upon for fast, accurate results in life sciences and pharmaceutical quality control applications.

    (6 per CS )
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    $382.20
  24. Silver Diethyldithiocarbamate TS - 1L
    Manufacturer: Dawn Scientific
    Silver Diethyldithiocarbamate TS - 1L (1 per EA )
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    was $384.62 Special Price $375.01
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